Rebull, L. M., Padgett, D. L., Hillenbrand, L. A., Stapelfeldt, K. R., Noriega-Crespo, A., ...
We report on the properties of pre-main-sequence objects in the Taurus molecular clouds as observed in 7 mid- and far-infrared bands with the Spitzer Space Telescope. There are 215...
Chromospheric Variability in SDSS M Dwarfs. II. Short-Timescale H-alpha Variability (2009)
Kruse, E. A., Berger, E., Knapp, G. R., Gunn, J. E., Loomis, C. P., Lupton, R. H., ...
[Abridged] We present the first comprehensive study of short-timescale chromospheric H-alpha variability in M dwarfs using the individual 15 min spectroscopic exposures for 52,392 objects from the...
Automated Determination of [Fe/H] and [C/Fe] from Low-Resolution Spectroscopy (2009)
Marsteller, B., Beers, T. C., Sivarani, T., Rossi, S., Placco, V., Knapp, G. R., ...
We develop an automated spectral synthesis technique for the estimation of metallicities ([Fe/H]) and carbon abundances ([C/Fe]) for metal-poor stars, including carbon-enhanced metal-poor stars, for...
The Seventh Data Release of the Sloan Digital Sky Survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes...
Wide-Field Astronomical Surveys in the Next Decade (2009)
Strauss, M. A., Tyson, J. A., Anderson, S. F., Axelrod, T. S., Becker, A. C., Bickerton, S. J., ...
Wide-angle surveys have been an engine for new discoveries throughout the modern history of astronomy, and have been among the most highly cited and scientifically productive observing facilities in...
The seventh data release of the sloan digital sky survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
Storm, J., Knapp, G. R., Zinnecker, H.
(abridged) Deep multi-epoch Sloan Digital Sky Survey data in a 275 square degrees area along the celestial equator (SDSS stripe 82 = S82) allowed us to search for extremely faint ($i>21$) objects...
Additional Ultracool White Dwarfs Found in the Sloan Digital Sky Survey (2008)
Harris, H. C., Gates, E., Gyuk, G., Subbarao, M., Anderson, S. F., Hall, P. B., ...
We identify seven new ultracool white dwarfs discovered in the Sloan Digital Sky Survey (SDSS). The SDSS photometry, spectra, and proper motions are presented, and additional BVRI data are given for...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Prieto, Carlos Allende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
Two More Candidate AM Canum Venaticorum (AM CVn) Binaries from the Sloan Digital Sky Survey (2008)
Anderson, S. F., Becker, A. C., Haggard, D., Prieto, J. L., Knapp, G. R., Sako, M., ...
AM CVn systems are a select group of ultracompact binaries with the shortest orbital periods of any known binary subclass; mass-transfer is likely from a low-mass (partially-)degenerate secondary...
Radio Frequency Continuum Emission from Evolved Stars (2008)
G.R. Knapp, P. F. Bowers, K. Young, T. G. Phillips
The evolution of stars between the AGB and planetary nebula phases was investigated by sensitive radio continuum observations of a sample of 21 evolved stars with high mass loss rates and extended...
The Circumstellar Envelope of π¹ Gru (2008)
G.R. Knapp, K. Young, M. Crosas
. CO(J = 2--1) and SiO(J = 5--4) emission has been observed from the molecular envelope around the nearby S star ß 1 Gru. The CO line profile differs from the usual parabolic shape seen in...
The sixth data release of the sloan digital sky survey (2008)
Adelman-McCarthy, Jennifer K., Agüros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, Anderson, Kurt S. J., Anderson, Scott F., ...
Atomic Carbon in the Envelopes of Carbon-Rich Post-AGB Stars (2007)
G.R. Knapp, M. Crosas, K. Young
Atomic carbon has been detected in the envelopes of three carbon-rich evolved stars: HD 44179 (=AFGL 915, the `Red Rectangle'); HD 56126; and, tentatively, the carbon star V Hya. This brings to...
Limits On Ionized Gas In Globular Clusters (2007)
G. R. Knapp, J. E. Gunn, P. F. Bowers
Globular clusters are expected to accumulate interstellar gas due to mass loss from their stars. A sensitive search of six clusters for free-free emission from ionized gas at 8.4 GHz using the VLA...
Stellar Outflows Driven By Radiation Pressure (2007)
Ivezi Knapp, G. R. Knapp, M. Elitzur
We present a detailed, self-consistent model of radiatively driven stellar outflows which couples the radiative transfer and hydrodynamics equations. The circumstellar envelope, which consists of gas...
Molecules, Dust and the Structure of Circumstellar Envelopes (2007)
. Radio continuum and spectral line emission from the photospheres and circumstellar shells of evolved cool giant stars trace their size, shape and mass loss history. The stars themselves are larger...
Molecular Gas In Elliptical Galaxies: Co Observations Of An Iras Flux Limited Sample (2007)
A search for CO(2--1) emission from 42 early type galaxies with 100¯m flux densities greater than 1 Jy detected (tentatively in some cases) eleven galaxies and tentatively found absorption against...
Maps of the Molecular Emission around 18 Evolved Stars (2007)
K. Z. Stanek, G. R. Knapp, K. Young, T. G. Phillips
We present maps at 20 00 resolution of the molecular emission around 18 evolved stars (14 asymptotic giant branch stars, one supergiant, two proto-planetary nebulae and one planetary nebula), mostly...
D. P. Schneider, Gary J. Hill, X. Fan, L. W. Ramsey, P. J. Macqueen, D. W. Weedman, ...
ABSTRACT. This paper describes spectra of quasar candidates acquired during the commissioning phase of the Low-Resolution Spectrograph of the Hobby-Eberly Telescope. The objects were identiÐed as...
The Sloan Digital Sky Survey Quasar Catalog IV. Fifth Data Release (2007)
Schneider, Donald P., Hall, Patrick B., Richards, Gordon T., Strauss, Michael A., Berk, Daniel E. Vanden, Anderson, Scott F., ...
We present the fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase of over 30,000 entries since the previous edition. The...
Dufour, P., Bergeron, P., Liebert, James, Harris, H. C., Knapp, G. R., Hall, Patrick B., ...
We present a detailed analysis of a large spectroscopic and photometric sample of DZ white dwarfs based on our latest model atmosphere calculations. We revise the atmospheric parameters of the...
An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data (2007)
Padmanabhan, N., Schlegel, D. J., Finkbeiner, D. P., Barentine, J. C., Blanton, M. R., Brewington, H. J., ...
We present an algorithm to photometrically calibrate wide field optical imaging surveys, that simultaneously solves for the calibration parameters and relative stellar fluxes using overlapping...
Science Results Enabled by SDSS Astrometric Observations (2007)
Ivezic, Z., Bond, N., Juric, M., Munn, J. A., Lupton, R. H., Pier, J. R., ...
We discuss several results made possible by accurate SDSS astrometric measurements in a large sky area, with emphasis on asteroids and stellar proper motions obtained by comparing POSS and SDSS. SDSS...
The fifth data release of the sloan digital sky survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release (2007)
Schneider, Donald P., Hall, Patrick B., Richards, Gordon T., Strauss, Michael A., Vanden Berk, Daniel E., Anderson, Scott F., ...
We present the fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase of over 30,000 entries since the previous edition. The...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
A Comparison of SDSS Standard Star Catalog for Stripe 82 with Stetson's Photometric Standards (2007)
Ivezic, Z., Smith, J. A., Miknaitis, G., Lin, H., Tucker, D. L., Lupton, R., ...
We compare Stetson's photometric standards with measurements listed in a standard star catalog constructed using repeated SDSS imaging observations. The SDSS catalog includes over 700,000 candidate...
The Sloan Digital Sky Survey Monitor Telescope Pipeline (2006)
Tucker, D. L., Kent, S., Richmond, M. W., Annis, J., Smith, J. A., Allam, S. S., ...
The photometric calibration of the Sloan Digital Sky Survey (SDSS) is a multi-step process which involves data from three different telescopes: the 1.0-m telescope at the US Naval Observatory (USNO),...
Model Atmosphere Analysis of the Weakly Magnetic DZ White Dwarf G165-7 (2006)
Dufour, P., Bergeron, P., Schmidt, G. D., Liebert, James, Harris, H. C., Knapp, G. R., ...
A reanalysis of the strongly metal-blanketed DZ white dwarf G165-7 is presented. An improved grid of model atmospheres and synthetic spectra is used to analyze BVRI, JHK, and ugriz photometric...
Obric, M., Ivezic, Z., Best, P. N., Lupton, R. H., Tremonti, C., Brinchmann, J., ...
We discuss the panchromatic properties of 99,088 galaxies selected from the SDSS Data Release 1 spectroscopic sample (a flux-limited sample for 1360 deg^2). These galaxies are positionally matched to...
The Rest-frame Optical Colors of 99,000 SDSS Galaxies (2006)
Smolcic, V., Ivezic, Z., Gacesa, M., Rakos, K., Pavlovski, K., Ilijic, S., ...
We synthesize the rest-frame Stroemgren colors using SDSS spectra for 99,088 galaxies selected from Data Release 1. This narrow-band ~200 AA photometric system (uz, vz, bz, yz), first designed for...
The Clustering of Luminous Red Galaxies in the Sloan Digital Sky Survey Imaging Data (2006)
Padmanabhan, N., Schlegel, D. J., Seljak, U., Makarov, A., Bahcall, N. A., Blanton, M. R., ...
We present the 3D real space clustering power spectrum of a sample of \~600,000 luminous red galaxies (LRGs) measured by the Sloan Digital Sky Survey (SDSS), using photometric redshifts. This sample...
The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three (2006)
Richards, Gordon T., Strauss, Michael A., Fan, Xiaohui, Hall, Patrick B., Jester, Sebastian, Schneider, Donald P., ...
We determine the number counts and z=0-5 luminosity function for a well-defined, homogeneous sample of quasars from the Sloan Digital Sky Survey (SDSS). We conservatively define the most uniform...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The rest-frame optical colours of 99 000 sloan digital sky survey galaxies (2006)
Smolčić, V., Ivezić, Z., Gaćeša, M., Rakos, K., Pavlovski, K., Ilijić, S., ...
The rest-frame optical colours of 99000 Sloan Digital Sky Survey galaxies (2006)
Smolcic, V., Ivezic, Z., Gacesa, M., Rakos, K., Pavlovski, K., Ilijic, S., ...
We discuss the colours of 99088 galaxies selected from the Sloan Digital Sky Survey (SDSS) Data Release 1 `main' spectroscopic sample (a flux-limited sample, rPet < 17.77, for 1360 deg2) in the...
The Sloan Digital Sky Survey quasar survey: Quasar luminosity function from data release 3 (2006)
Richards, Gordon T., Strauss, Michael A., Fan, Xiaohui, Hall, Patrick B., Jester, Sebastian, Schneider, Donald P., ...
We determine the number counts and z=0-5 luminosity function for a well-defined, homogeneous sample of quasars from the Sloan Digital Sky Survey (SDSS). We conservatively define the most uniform...
Obric, M., Ivezic, Z., Best, P. N., Lupton, R. H., Tremonti, C., Brinchmann, J., ...
We discuss the panchromatic properties of 99088 galaxies selected from the Sloan Digital Sky Survey (SDSS) Data Release 1 `main' spectroscopic sample (a flux-limited sample for 1360deg2). These...
The Fourth Data Release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
SDSSJ103913.70+533029.7: A Super Star Cluster in the Outskirts of a Galaxy Merger (2005)
Knapp, G. R., Tremonti, C. A., Rockosi, C. M.
We describe the serendipitous discovery in the spectroscopic data of the Sloan Digital Sky Survey of a star-like object, SDSSJ103913.70+533029.7, at a heliocentric radial velocity of +1012 km/s. Its...
The White Dwarf Luminosity Function from SDSS Imaging Data (2005)
Harris, Hugh C., Munn, Jeffrey A., Kilic, Mukremin, Liebert, James, Williams, Kurtis A., Von Hippel, Ted, ...
A sample of white dwarfs is selected from SDSS DR3 imaging data using their reduced proper motions, based on improved proper motions from SDSS plus USNO-B combined data. Numerous SDSS and followup...
Candidate spectroscopic binaries in the Sloan Digital Sky Survey (2005)
Pourbaix, D., Knapp, G. R., Szkody, P., Ivezic, Z., Kleinman, S. J., Long, D., ...
We have examined the radial velocity data for stars spectroscopically observed by the Sloan Digital Sky Survey (SDSS) more than once to investigate the incidence of spectroscopic binaries, and to...
The Sloan Digital Sky Survey Quasar Catalog III. Third Data Release (2005)
Schneider, D. P., Hall, P. B., Richards, G. T., Berk, D. E. Vanden, Anderson, S. F., Fan, X., ...
We present the third edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog consists of the 46,420 objects in the SDSS Third Data Release that have luminosities larger than M_i =...
Eisenstein, D. J., Zehavi, I., Hogg, D. W., Scoccimarro, R., Blanton, M. R., Nichol, R. C., ...
We present the large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies from the Sloan Digital Sky Survey. The survey region covers 0.72 h^{-3} Gpc^3 over...
The third data release of the sloan digital sky survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg2,...
SDSS Data Management and Photometric Quality Assessment (2004)
Ivezic, Z., Lupton, R. H., Schlegel, D., Boroski, B., Adelman-McCarthy, J., Yanny, B., ...
We summarize the Sloan Digital Sky Survey data acquisition and processing steps, and describe runQA, a pipeline designed for automated data quality assessment. In particular, we show how the position...
NYU-VAGC: a galaxy catalog based on new public surveys (2004)
Blanton, Michael R., Schlegel, David J., Strauss, Michael A., Brinkmann, J., Finkbeiner, Douglas, Fukugita, Masataka, ...
Here we present the New York University Value-Added Galaxy Catalog (NYU-VAGC), a catalog of local galaxies (mostly below a redshift of about 0.3) based on a set of publicly-released surveys...
Golimowski, D. A., Leggett, S. K., Marley, M. S., Knapp, G. R.
We present new JHKL'M' photometry on the MKO system for a large sample of L and T dwarfs identified from SDSS and 2MASS and classified according to the scheme of Geballe et al. (2002). We have...
The Luminosity and Color Dependence of the Galaxy Correlation Function (2004)
Zehavi, I., Zheng, Z., Weinberg, D. H., Frieman, J. A., Berlind, A. A., Blanton, M. R., ...
We study the luminosity and color dependence of the galaxy 2-point correlation function in the Sloan Digital Sky Survey, starting from a sample of 200,000 galaxies over 2500 deg^2. We concentrate on...
Multiwavelength View of SDSS Galaxies (2004)
Obric, M., Ivezic, Z., Kauffmann, G., Lupton, R. H., Tremonti, C., Brinchmann, J., ...
We summarize the detection rates at wavelengths other than optical for \~99,000 galaxies from the Sloan Digital Sky Survey (SDSS) Data Release 1 ``main'' spectroscopic sample. The analysis is based...
Quasar Variability Measurements With SDSS Repeated Imaging and POSS Data (2004)
Ivezic, Z, Lupton, R. H., Juric, M., Anderson, S., Hall, P. B., Richards, G. T., ...
We analyze the properties of quasar variability using repeated SDSS imaging data in five UV-to-far red photometric bands, accurate to 0.02 mag, for 13,000 spectroscopically confirmed quasars. The...
Unconventional AGN from the SDSS (2004)
Hall, Patrick B., Knapp, G. R., Richards, G. T., Strauss, M. A., Anderson, S. F., Schneider, D. P., ...
We discuss some of the most unusual active galactic nuclei (AGN) discovered to date by the Sloan Digital Sky Survey (SDSS): the first broad absorption line quasar seen to exhibit He II absorption,...
The Distribution of Quasars and Galaxies in Radio Color-Color and Morphology Diagrams (2004)
Ivezic, Z., Siverd, R. J., Steinhardt, W., Jagoda, A. S., Knapp, G. R., Lupton, R. H., ...
We positionally match the 6 cm GB6, 20 cm FIRST and NVSS, and 92 cm WENSS radio catalogs and find 16,500 matches in ~3,000 deg2 of sky. Using this unified radio database, we construct radio...
Variable Faint Optical Sources Discovered by Comparing POSS and SDSS Catalogs (2004)
Sesar, B., Svilkovic, D., Ivezic, Z., Lupton, R. H., Munn, J. A., Finkbeiner, D., ...
We present a study of variable faint optical sources discovered by comparing the Sloan Digital Sky Survey (SDSS) and the Palomar Observatory Sky Survey (POSS) catalogs. We use SDSS measurements to...
A Second Stellar Color Locus: a Bridge from White Dwarfs to M stars (2004)
Smolcic, V., Ivezic, Z., Knapp, G. R., Lupton, R. H., Pavlovski, K., Ilijic, S., ...
We report the discovery of a locus of stars in the SDSS g-r vs. u-g color-color diagram that connects the colors of white dwarfs and M dwarfs. While its contrast with respect to the main stellar...
Color-Induced Displacement double stars in SDSS (2004)
Pourbaix, D., Ivezic, Z., Knapp, G. R., Gunn, J. E.
We report the first successful application of the astrometric color-induced displacement technique (CID, the displacement of the photocenter between different bandpasses due to a varying contribution...
Knapp, G. R., Leggett, S. K., Fan, X., Marley, M. S., Geballe, T. R., Golimowski, D. A.
We present JHK photometry and spectroscopy for a sample of newly identified L and T dwarfs from the Sloan Digital Sky Survey (SDSS) and known dwarfs from the SDSS and the Two Micron All Sky Survey...
L' and M' Photometry of Ultracool Dwarfs (2004)
Golimowski, D. A., Leggett, S. K., Marley, M. S., Fan, X., Geballe, T. R., Knapp, G. R., ...
We have compiled L' and M' photometry of 63 single and binary M, L,and T dwarfs obtained at UKIRT using the MKO filter set. This compilation includes new L' data for 8 L dwarfs and 13 T dwarfs and...
Vrba, F. J., Henden, A. A., Luginbuhl, C. B., Guetter, H. H., Munn, J. A., Canzian, B., ...
We present preliminary trigonometric parallaxes and proper motions for 22 L dwarfs and 18 T dwarfs measured using the ASTROCAM infrared imager. Relative to absolute parallax corrections are made by...
Kleinman, S. J., Harris, Hugh C., Eisenstein, Daniel J., Liebert, James, Nitta, Atsuko, Krzesiński, Jurek, ...
We present the full spectroscopic white dwarf and hot subdwarf sample from the SDSS first data release, DR1. We find 2551 white dwarf stars of various types, 240 hot subdwarf stars, and an additional...
Downes, Ronald A., Margon, Bruce, Anderson, Scott F., Harris, Hugh C., Knapp, G. R., Schroeder, Josh, ...
A search of more than 3,000 square degrees of high latitude sky by the Sloan Digital Sky Survey has yielded 251 faint high-latitude carbon stars (FHLCs), the large majority previously uncataloged. We...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
Padmanabhan, Nikhil, Schlegel, David J., Carr, Michael A., Gunn, James E., Rockosi, Constance M., ...
Multiwavelength view of SDSS galaxies (2004)
Obric, M., Ivezic, Z., Lupton, R. H., Kauffmann, G., Knapp, G. R., Gunn, J. E., ...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt, Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg2 of five-band (ugriz) imaging data with photometry for...
Finkbeiner, Douglas P., Padmanabhan, Nikhil, Schlegel, David J., Carr, Michael A., Gunn, James E., Rockosi, Constance M., ...
The Sloan Digital Sky Survey (SDSS) mosaic camera and telescope have obtained five-band optical-wavelength imaging near the Galactic plane outside of the nominal survey boundaries. These additional...
Counts of Low-redshift SDSS Quasar Candidates (2003)
Ivezic, Z., Lupton, R. H., Johnston, D. E., Richards, G. T., Hall, P. B., Schlegel, D., ...
We analyze the counts of low-redshift quasar candidates selected using nine-epoch SDSS imaging data. The co-added catalogs are more than 1 mag deeper than single-epoch SDSS data, and allow the...
Quasar Radio Dichotomy: Two Peaks, or not Two Peaks, that is the Question (2003)
Ivezic, Z., Richards, G. T., Hall, P. B., Lupton, R. H., Jagoda, A. S., Knapp, G. R., ...
Recent claims by Ivezic et al. (2002) that the distribution of the radio-to-optical flux ratio, R, for quasars is bimodal (the so-called quasar radio dichotomy) were questioned on statistical grounds...
Reaching to the Edge of the Milky Way Halo with SDSS (2003)
Ivezic, Z., Lupton, R. H., Schlegel, D., Smolcic, V., Johnston, D., Gunn, J. E., ...
We discuss a sample of over 3000 candidate RR Lyrae stars selected by various methods using Sloan Digital Sky Survey data for about 1000 deg^2 of sky. These stars probe the halo structure out to ~100...
Halo Structure Traced by SDSS RR Lyrae (2003)
Ivezic, Z., Lupton, R. H., Schlegel, D., Smolcic, V., Johnston, D., Gunn, J. E., ...
We discuss the density and radial velocity distributions of over 3000 candidate RR Lyrae stars selected by various methods using Sloan Digital Sky Survey data for about 1000 deg^2 of sky. This is...
Continuum and Emission-Line Properties of Broad Absorption Line Quasars (2003)
Reichard, Timothy A., Richards, Gordon T., Hall, Patrick B., Schneider, Donald P., Berk, Daniel E. Vanden, Fan, Xiaohui, ...
We investigate the continuum and emission-line properties of 224 broad absorption line quasars (BALQSOs) with 0.9
An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey (2003)
Harris, H. C., Liebert, J., Kleinman, S. J., Nitta, A., Anderson, S. F., Knapp, G. R., ...
An initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full survey will be,...
Red and Reddened Quasars in the Sloan Digital Sky Survey (2003)
Richards, Gordon T., Hall, Patrick B., Berk, Daniel E. Vanden, Strauss, Michael A., Schneider, Donald P., Weinstein, Michael A., ...
We investigate the continuum and emission line properties of 4576 SDSS quasars as a function of their optical/UV SEDs. The optical/UV color distribution of our sample is roughly Gaussian, but with a...
Hubble Space Telescope Observations of Binary Very-Low-Mass Stars and Brown Dwarfs (2003)
Gizis, J. E., Reid, I. N., Knapp, G. R., Liebert, J., Kirkpatrick, J. D., Koerner, D. W., ...
We present analysis of Hubble Space Telescope images of 82 nearby field late-M and L dwarfs. We resolve 13 of these systems into double M/L dwarf systems and identify an additional possible binary....
Knapp, G. R., Pourbaix, D., Platais, I., Jorissen, A.
We analyze the K band luminosities of a sample of galactic long-period variables using parallaxes measured by the Hipparcos mission. The parallaxes are in most cases re-computed from the Hipparcos...
Variability Studies with SDSS (2003)
Ivezic, Z., Lupton, R. H., Anderson, S., Eyer, L., Juric, M., Knapp, G. R., ...
The potential of the Sloan Digital Sky Survey for wide-field variability studies is illustrated using multi-epoch observations for 3,000,000 point sources observed in 700 deg2 of sky, with time spans...
Reichard, Timothy A., Richards, Gordon T., Schneider, Donald P., Hall, Patrick B., Tolea, Alin, Krolik, Julian H., ...
We present a catalog of 224 broad absorption line quasars (BALQSOs) from the Sloan Digital Sky Survey's Early Data Release Quasar Catalog, including a relatively complete and homogeneous subsample of...
The first data release of the sloan digital sky survey (2003)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The first data release of the sloan digital sky survey (2003)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
Selection of metal-poor giant stars using the Sloan Digital Sky Survey photometric system (2003)
Helmi, A., Ivezic, Z., Prada, F., Pentericci, L., Rockosi, C.M., Schneider, D.P., ...
Selection of Metal-poor Giant Stars Using the Sloan Digital Sky Survey Photometric System (2002)
Helmi, A., Ivezic, Z., Prada, F., Pentericci, L., Rockosi, C. M., Schneider, D. P., ...
We present a method for photometric selection of metal-poor halo giants from the imaging data of the Sloan Digital Sky Survey (SDSS). These stars are offset from the stellar locus in the (g-r) vs....
Color Confirmation of Asteroid Families (2002)
Ivezic, Z., Lupton, R. H., Juric, M., Tabachnik, S., Quinn, T., Gunn, J. E., ...
We discuss optical colors of 10,592 asteroids with known orbits selected from a sample of 58,000 moving objects observed by the Sloan Digital Sky Survey (SDSS). This is more than ten times larger...
Margon, Bruce, Anderson, Scott F., Harris, Hugh C., Strauss, Michael A., Knapp, G. R., Fan, Xiaohui, ...
We report the discovery of 39 Faint High Latitude Carbon Stars (FHLCs) from Sloan Digital Sky Survey commissioning data. The objects, each selected photometrically and verified spectroscopically,...
Characterization of M,L and T dwarfs in the Sloan Digital Sky Survey (2002)
Hawley, S. L., Covey, K. R., Knapp, G. R., Golimowski, D. A., Fan, X., Collaboration, For The SDSS
An extensive sample of M, L and T dwarfs identified in the Sloan Digital Sky Survey (SDSS) has been compiled. The sample of 718 dwarfs includes 677 new objects (629 M dwarfs, 48 L dwarfs) together...
Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey (2002)
Hall, Patrick B., Anderson, S. F., Strauss, M. A., York, D. G., Richards, G. T., Fan, X., ...
The Sloan Digital Sky Survey has confirmed the existence of populations of broad absorption line (BAL) quasars with various unusual properties. We present and discuss twenty-three such objects and...
The Galactic Distribution of Asymptotic Giant Branch Stars (2002)
Jackson, T., Ivezic, Z., Knapp, G. R.
We study the Galactic distribution of ~10,000 Asymptotic Giant Branch (AGB) stars selected by IRAS colors and variability index. The distance to each star is estimated by assuming a narrow luminosity...
Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys (2002)
Ivezic, Z., Menou, K., Strauss, M., Knapp, G. R., Lupton, H. R., Berk, D. Vanden, ...
We discuss the optical and radio properties of 30,000 FIRST sources positionally associated with an SDSS source in 1230 deg$^2$ of sky. The majority (83%) of the FIRST sources identified with an SDSS...
Observations of Carbon Recombination Line Emission in the Reflection Nebula M78 (16), (2002)
Brown,Robert L., Knapp,G. R., Kuiper,T. B. H., Kuiper,Eva N. R.
The C116 (alpha) and C142 (alpha) recombination lines have been detected in the reflection nebula M78. The line emission arises in a cold T approximately equal 20K CII Stromgren sphere ionized by...
OH and H2O Masers in the Monoceros-R2 Molecular Cloud, (2002)
Emission from OH and H2O masers has been detected in the direction of the Monoceros-R2 molecular cloud. Only the 1612 and 1665 MHz OH lines are observed, and from the emission characteristics of the...
CO Observations of the Expanding Envelope of IRC+10216 (8), (2002)
Kuiper,T. B. H., Knapp,G. R., Knapp,S. L., Brown,Robert L.
The authors report high-sensitivity emission profiles from the J = 0-1 transitions of (12C16O) and (13C16O) towards IRC+10216. It appears that the spherically symmetric uniform mass-outflow model...
Carbon Recombination Line Observations of the Sharpless 140 Region, (2002)
Knapp,G. R., Brown,Robert L., Kuiper,T. B. H., Kakar,R. K.
Carbon recombination line emission has been detected at two frequencies from a dark cloud contiguous with the small HII region Sharpless 140. The observations show the dark cloud to be of unusually...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, Chirs, Lupton, Rpbert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francsico J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Galaxy clustering in early Sloan Digital Sky Survey redshift data (2002)
Zehavi, I., Blanton, M. R., Frieman, J. A., Weinberg, D. H., Mo, H. J., Strauss, M. A., ...
We present the first measurements of clustering in the Sloan Digital Sky Survey (SDSS) galaxy redshift survey. Our sample consists of 29,300 galaxies with redshifts 5700 km s(-1) less than or equal...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, C., Lupton, R. H., Bernardi, M., Blanton, M. R., Burles, S., Castander, F. J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey (2002)
Hall, Patrick B., Anderson, Scott F., Strauss, Michael A., York, Donald G., Richards, Gordon T., Fan, Xiaohui, ...
Ivezic, Z., Becker, R. H., Blanton, M., Fan, X., Finlator, K., Gunn, J. E., ...
We positionally match sources observed by the Sloan Digital Sky Survey (SDSS), the Two Micron All Sky Survey (2MASS), and the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey. Practically...
Early-type galaxies in the SDSS (2001)
Bernardi, M., Sheth, R. K., Annis, J., Burles, S., Eisenstein, D. J., Finkbeiner, D. P., ...
A sample of nearly 9000 early-type galaxies, in the redshift range 0.01
Cataclysmic Variables from SDSS I. The First Results (2001)
Szkody, P., Anderson, S. F., Agueros, M., Covarrubias, R., Bentz, M., Hawley, S., ...
The commissioning year of the Sloan Digital Sky Survey has demonstrated that many cataclysmic variables have been missed in previous surveys with brighter limits. We report the identification of 22...
Infrared Colors of L and T Dwarfs (2001)
Leggett, S. K., Golimowski, D. A., Fan, X., Geballe, T. R., Knapp, G. R.
We discuss the behaviour of the JHKL'M' colors of L and T dwarfs, based on photometric and spectroscopic data obtained at the United Kingdom Infrared Telescope in Hawaii. We have measured the first...
Infrared Classification of L and T Dwarfs (2001)
Geballe, T. R., Knapp, G. R., Leggett, S. K., Fan, X., Golimowski, D. A.
We use new and published medium resolution 0.6--2.5 $\mu$m spectra of L and T dwarfs to develop a unified classification system for both of these new spectral classes. Two indices of the system at...
Infrared Photometry of Late-M, L, and T Dwarfs (2001)
Leggett, S. K., Golimowski, D. A., Fan, X., Geballe, T. R., Knapp, G. R.
We present ZJHKL'M' photometry of a sample of 58 late-M, L, and T dwarfs, most of which are identified from the Sloan Digital Sky Survey and the Two Micron All-Sky Survey. Near-infrared spectra and...
Geballe, T. R., Knapp, G. R., Leggett, S. K., Fan, X., Golimowski, D. A.
We present 0.6-2.5um, R~400 spectra of twenty-seven cool, low luminosity stars and substellar objects. Based on these and previously published spectra we develop a preliminary spectral classification...
Eisenstein, D. J., Annis, J., Gunn, J. E., Szalay, A. S., Connolly, A. J., Nichol, R. C., ...
We describe the target selection and resulting properties of a spectroscopic sample of luminous, red galaxies (LRG) from the imaging data of the Sloan Digital Sky Survey (SDSS). These galaxies are...
Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar (2001)
Becker, Robert H., Fan, Xiaohui, White, Richard L., Strauss, Michael A., Narayanan, Vijay K., Lupton, Robert H., ...
We present moderate resolution Keck spectroscopy of quasars at z=5.82, 5.99 and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Ly Alpha absorption in the spectra of these...
Extreme BAL Quasars from the Sloan Digital Sky Survey (2001)
Hall, Patrick B., Gunn, J. E., Knapp, G. R., Narayanan, V. K., Strauss, M. A., Anderson, S. F., ...
The Sloan Digital Sky Survey has discovered a population of broad absorption line quasars with various extreme properties. Many show absorption from metastable states of FeII with varying...
Infrared Observations and Modeling of one of the Coolest T Dwarfs, Gl 570D (2001)
Geballe, T. R., Saumon, D., Leggett, S. K., Knapp, G. R., Marley, M. S., Lodders, K.
We have obtained a good quality R$\sim$400 0.8-2.5 $\mu$m spectrum and accurate photometry of Gl 570D, one of the coolest and least luminous brown dwarfs currently known. The spectrum shows that Gl...
Knapp, G. R., Pourbaix, D., Jorissen, A.
The Hipparcos Intermediate Astrometric Data for carbon stars have been reprocessed using an algorithm which provides an objective criterion for rejecting anomalous data points and constrains the...
Analysis of Stars Common to the IRAS and HIPPARCOS Surveys (2001)
Knauer, T. G., Ivezic, Z., Knapp, G. R.
For about 11,000 stars observed in the HIPPARCOS Survey and detected by IRAS we calculate bolometric luminosities by integrating their spectral energy distributions from the B band to far-IR...
100-year Mass Loss Modulations on the Asymptotic Giant Branch (2001)
Marengo, M., Ivezic, Z., Knapp, G. R.
We analyze the differences in infrared circumstellar dust emission between oxygen rich Mira and non-Mira stars, and find that they are statistically significant. In particular, we find that these...
Geballe, T. R., Noll, K. S., Leggett, S. K., Knapp, G. R., Fan, X., Golimowski, D
We present infrared spectra of brown dwarfs with spectral types from mid-L to T. The 0.9-2.5 $\mu$m spectra of three dwarfs found by the Sloan Digital Sky Survey contain absorption bands of both...
A New Very Cool White Dwarf Discovered by the Sloan Digital Sky Survey (2001)
Harris, H. C., Hansen, B. M. S., Liebert, J., Berk, D. E. Vanden, Anderson, S. F., Knapp, G. R., ...
Early data taken during commissioning of the SDSS have resulted in the discovery of a very cool white dwarf. It appears to have stronger collision induced absorption from molecular hydrogen than any...
Discovery of a Close Pair of z = 4.25 Quasars from the Sloan Digital Sky Survey (2000)
Schneider, Donald P., Fan, Xiaohui, Strauss, Michael A., Gunn, James E., Richards, Gordon T., Knapp, G. R., ...
We report the discovery of a pair of z = 4.25 quasars with a separation of 33 arcseconds. The brighter of the two objects was identified as a high-redshift quasar candidate from Sloan Digital Sky...
The Discovery of a Luminous z=5.80 Quasar from the Sloan Digital Sky Survey (2000)
Fan, X., White, R. L., Davis, M., Becker, R. H., Strauss, M. A., Haiman, Z., ...
We present observations of SDSSp J104433.04--012502.2, a luminous quasar at z=5.80 discovered from Sloan Digital Sky Survey (SDSS) multicolor imaging data. This object was selected as an i'-band...
Zheng, W., Tsvetanov, Z. I., Schneider, D. P., Fan, X., Becker, R. H., Davis, M., ...
We report the discovery of five quasars with redshifts of 4.67 - 5.27 and z'-band magnitudes of 19.5-20.7 M_B ~ -27. All were originally selected as distant quasar candidates in optical/near-infrared...
Yanny, B., Newberg, H. J., Kent, S., Laurent-Muehleisen, S. A., Pier, J. R., Richards, G. T., ...
A sample of 4208 objects with magnitude 15 < g* < 22 and colors of main sequence A stars has been selected from 370 square degrees of Sloan Digital Sky Survey (SDSS) commissioning observations. The...
Atomic Carbon in the Envelopes of Carbon-Rich Post-AGB Stars (1999)
Knapp, G. R., Crosas, M., Young, K., Ivezic, Z.
Atomic carbon has been detected in the envelopes of three carbon-rich evolved stars: HD 44179 (=AFGL 915, the `Red Rectangle'); HD 56126; and, tentatively, the carbon star V Hya. This brings to seven...
The Light Curve and Evolutionary Status of the Carbon Star V Hya (1999)
Knapp, G. R., Dobrovolsky, S. I., Ivezic, Z., Young, K., Crosas, M., Mattei, J. A., ...
V Hya, an evolved carbon star with a complex circumstellar envelope, has two variability periods, 530d and 6000d (17 years). We analyze recent light curve data and show that both variations have benn...
The Circumstellar Envelope of pi Gru (1999)
Knapp, G. R., Young, K., Crosas, M.
CO(J = 2-1) and SiO(J = 5-4) emission has been observed from the molecular envelope around the nearby S star pi Gru. The CO line profile differs from the usual parabolic shape seen in uniformly...
Panel Discussion: Star Formation in Early-Type Galaxies. (1999)
Knapp, G.R., Binette, L., Bower, R., Brinks, E., Goudfrooij, P., Hau, G., ...
H2O Maser Emission Associated with T Tauri and other Regions of Star Formation, (1998)
The detection of H2O maser emission is reported from three new galactic regions: a point 0.9 min NE of T Tauri, and towards the HII regions G29.9-0.0 and G0.55-0.85. The T Tauri water source is not...
CO Observations of NGC1579 (S222) and S239, (1998)
Knapp,G. R., Kuiper,T. B. H., Knapp,S. L., Brown,Robert L.
The 2.6-mm lines of 12CO and 13CO have been observed towards the small galactic diffuse nebulae NGC1579 (s222) and s239. The H92 alpha recombination line has also been detected from NGC1579. Towards...
Knapp,G. R., Kuiper,T. B. H., Brown,Robert L.
High-sensitivity observations at the carbon 140 alpha and 141 alpha recombination line frequencies in the direction of the Rho Ophiuchi dust cloud show the presence of recombination lines of carbon...
The White Dwarf Luminosity Function from Sloan Digital Sky Survey Imaging Data (1998)
Harris, Hugh C., Munn, Jeffrey A., Kilic, Mukremin, Liebert, James, Kleinman, S. J., Metcalfe, T. S., ...
A sample of white dwarfs is selected from the Sloan Digital Sky Survey (SDSS) Data Release 3 using their reduced proper motions, based on improved proper motions from combined SDSS and USNO-B data....
Cold Gas and Star Formation in Elliptical Galaxies (1998)
Elliptical galaxies outside dense clusters are observed to contain small amounts (relative to spiral galaxies) of cold interstellar gas. This review discusses the atomic gas, the molecular gas, and...
Stellar Outflows Driven by Radiation Pressure (1998)
Ivezic, Z., Knapp, G. R., Elitzur, M.
We present a detailed, self-consistent model of radiatively driven stellar outflows which couples the radiative transfer and hydrodynamics equations. The circumstellar envelope, which consists of gas...
Knapp, G. R., Young, K., Lee, E., Jorissen, A.
This paper describes observations of a new phenomenon in evolved mass-losing AGB stars: the presence of two winds with different expansion velocities. CO(2-1) and CO(3-2) line emission was observed...
Circumstellar shells and mass loss rates: Clues to the evolution of S stars (1997)
It is the purpose of this paper to rediscuss the circumstellar properties of S stars and to put these properties in perspective with our current understanding of the evolutionary status of S stars,...
Maps of the Molecular Emission Around 18 Evolved Stars (1994)
Stanek, K. Z., Knapp, G. R., Young, K., Phillips, T. G.
We present maps at $20''$ resolution of the molecular emission around 18 evolved stars (14~asymptotic giant branch stars, one supergiant, two proto-planetary nebulae and one planetary nebula), mostly...
Arcminute Resolution VLA Imaging of High Latitude HI (1994)
Holdaway, M.A., Rupen, M.P., Knapp, G.R., West, S., Burton, W.B.
Arcminute Resolution VLA Imaging of High Latitude HI (1994)
Holdaway, M.A., Rupen, M.P., Knapp, G.R., West, S., Burton, W.B.
The CS molecule in diffuse interstellar clouds (1989)
Drdla, K., Knapp, G.R., Dishoeck, E.F. Van
The CS J = 2-1 emission line at 98 GHz has been searched for in 10 diffuse molecular clouds. CS column densities are derived by performing statistical equilibrium calculations for the rotational...
The CS molecule in diffuse interstellar clouds (1989)
Drdla, K., Knapp, G.R., Dishoeck, E.F. Van
The CS J = 2-1 emission line at 98 GHz has been searched for in 10 diffuse molecular clouds. CS column densities are derived by performing statistical equilibrium calculations for the rotational...
The distribution of neutral hydrogen in the Sombrero galaxy, NGC 4594 (1984)
Bajaja, E., Burg, G. Van Der, Faber, S.M., Gallagher, J.S., Knapp, G.R., Shane, W.W.
The distribution of neutral hydrogen in the Sombrero galaxy, NGC 4594 (1984)
Bajaja, E., Burg, G. Van Der, Faber, S.M., Gallagher, J.S., Knapp, G.R., Shane, W.W.
The Sloan Digital Sky Survey monitor telescope pipeline
Kent, S., Richmond, M.W., Annis, J., Smith, J.A., Allam, S.S., Rodgers, C.T., ...
The photometric calibration of the Sloan Digital Sky Survey (SDSS) is a multi-step process which involves data from three different telescopes: the 1.0-m telescope at the US Naval Observatory (USNO),...