Cross-Identification Performance from Simulated Detections: GALEX and SDSS (2009)
Heinis, Sebastien, Budavari, Tamas, Szalay, Alexander S.
We investigate the quality of associations of astronomical sources from multi-wavelength observations using simulated detections that are realistic in terms of their astrometric accuracy, small-scale...
Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample (2009)
Percival, Will J., Reid, Beth A., Eisenstein, Daniel J., Bahcall, Neta A., Budavari, Tamas, Frieman, Joshua A., ...
The spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample represents the final set of galaxies observed using the original SDSS target selection criteria. We analyse the...
Reid, Beth A., Percival, Will J., Eisenstein, Daniel J., Verde, Licia, Spergel, David N., Skibba, Ramin A., ...
We present the power spectrum of the reconstructed halo density field derived from a sample of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey Seventh Data Release (DR7). The halo...
Spatial Clustering from GALEX-SDSS samples: Star Formation History and large-scale clustering (2009)
Heinis, Sebastien, Budavari, Tamas, Szalay, Alex S., Arnouts, Stephane, Aragon-Calvo, Miguel A., Wyder, Ted K., ...
We measure the projected spatial correlation function w_p(r_p) from a large sample combining GALEX ultraviolet imaging with the SDSS spectroscopic sample. We study the dependence of the clustering...
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, ...
Yip, Ching-Wa, Connolly, Andrew, Berk, Daniel Vanden, Scranton, Ryan, Krughoff, Simon, Szalay, Alex, ...
Under the unified model for active galactic nuclei (AGNs), narrow-line (Type 2) AGNs are, in fact, broad-line (Type 1) AGNs but each with a heavily obscured accretion disk. We would therefore expect...
A Unified Framework for Photometric Redshifts (2008)
We present a rigorous mathematical solution to photometric redshift estimation and the more general inversion problem. The challenge we address is to meaningfully constrain unknown properties of...
Quenching of Star Formation (2008)
Wild, Vivienne, Budavari, Tamas, Blaizot, Jeremy, Walcher, C. Jakob, Johansson, Peter H., Lemson, Gerard, ...
In the last decade we have seen an enormous increase in the size and quality of spectroscopic galaxy surveys, both at low and high redshift. New statistical techniques to analyse large portions of...
Reliable Eigenspectra for New Generation Surveys (2008)
Budavari, Tamas, Wild, Vivienne, Szalay, Alexander S., Dobos, Laszlo, Yip, Ching-Wa
We present a novel technique to overcome the limitations of the applicability of Principal Component Analysis to typical real-life data sets, especially astronomical spectra. Our new approach...
Roy Williams Pi, Senior Personnel, Tamas Budavari, Jim Gray Microsoft, Sebastian Jester Fermilab, Chris Stoughton Fermilab, ...
The NSF National Virtual Observatory (NVO) is a multiyear effort to build tools, services, registries, protocols, and standards that can extract the full knowledge content of massive, multi-frequency...
Senior Personnel, Tamas Budavari, Alex Szalay
Astronomy faces a data avalanche. Breakthroughs in telescope, detector, and computer technology have allowed astronomical surveys to produce terabytes of images and catalogs. The NSF National Virtual...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, 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...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, 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...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, 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...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, 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...
Schiminovich, David, Wyder, Ted K., Martin, D. Christopher, Johnson, Benjamin. D., Salim, Samir, Seibert, Mark, ...
We use the UV-optical color magnitude diagram in combination with spectroscopic and photometric measurements derived from the SDSS spectroscopic sample to measure the distribution of galaxies in the...
Milliard, Bruno, Heinis, Sebastien, Blaizot, Jeremy, Arnouts, Stephane, Schiminovich, David, Budavari, Tamas, ...
We present the first measurements of the angular correlation function of galaxies selected in the far (1530 A) and near (2310 A) Ultraviolet from the GALEX survey fields overlapping SDSS DR5 in low...
Probabilistic Cross-Identification of Astronomical Sources (2007)
Budavari, Tamas, Szalay, Alexander S.
We present a general probabilistic formalism for cross-identifying astronomical point sources in multiple observations. Our Bayesian approach, symmetric in all observations, is the foundation of a...
The UV-optical Galaxy Color-Magnitude Diagram I: Basic Properties (2007)
Wyder, Ted K., Martin, D. Christopher, Schiminovich, David, Seibert, Mark, Budavari, Tamas, Treyer, Marie A., ...
We have analyzed the bivariate distribution of galaxies as a function of ultraviolet-optical colors and absolute magnitudes in the local universe. The sample consists of galaxies with redshifts and...
Heinis, Sebastien, Milliard, Bruno, Arnouts, Stephane, Blaizot, Jeremy, Schiminovich, David, Budavari, Tamas, ...
We analyze the clustering properties of ultraviolet selected galaxies by using GALEX-SDSS data at z 2) to low redshift (b ~ 0.79^{+0.1}_{-0.08}). When accounting for the fraction of the star...
The Calibration and Data Products of the Galaxy Evolution Explorer (2007)
Morrissey, Patrick, Conrow, Tim, Barlow, Tom A., Small, Todd, Seibert, Mark, Wyder, Ted K., ...
We describe the calibration status and data products pertaining to the GR2 and GR3 data releases of the Galaxy Evolution Explorer (GALEX). These releases have identical pipeline calibrations that are...
Bianchi, Luciana, Rodriguez-Merino, Lino, Viton, Maurice, Laget, Michel, Efremova, Boryana, Herald, James, ...
We use the Galaxy Evolution Explorer (GALEX) Medium and All-Sky-Imaging Survey (MIS & AIS) data from the first public data release (GR1), matched to the Sloan Digital Sky Survey (SDSS) DR3 catalog,...
Ongoing Formation of Bulges and Black Holes in the Local Universe: New Insights from GALEX (2007)
Kauffmann, Guinevere, Heckman, Timothy M., Budavari, Tamas, Charlot, Stephane, Hoopes, Charles G., Martin, D. Christopher, ...
We analyze a volume-limited sample of massive bulge-dominated galaxies with data from both the Sloan Digital Sky Survey and the Galaxy Evolution Explorer (GALEX) satellite. The galaxies have central...
Separating Physical Components from Galaxy Spectra by Subspace Methods (2007)
Yip, Ching-Wa, Szalay, Alex S., Connolly, Andrew, Budavari, Tamas
Using subspace methods, we study the distribution of physical components of galaxies in wavelength space. We find that it is valid to assume that the stellar and the gaseous components of galaxies...
Cross-Matching Multiple Spatial Observations and Dealing with Missing Data (2007)
Gray, Jim, Szalay, Alex, Budavari, Tamas, Lupton, Robert, Nieto-Santisteban, Maria, Thakar, Ani
Cross-match spatially clusters and organizes several astronomical point-source measurements from one or more surveys. Ideally, each object would be found in each survey. Unfortunately, the...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, 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...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, 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...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, 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...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, 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...
Cosmological constraints from the SDSS Luminous Red Galaxies (2006)
Tegmark, Max, Eisenstein, Daniel, Strauss, Michael, Weinberg, David, Blanton, Michael, Frieman, Joshua, ...
Also archived in: arXiv:astro-ph/0608632 v2 Oct 30 2006
Bianchi, Luciana, Rodriguez-Merino, Lino, Viton, Maurice, Laget, Michel, Efremova, Boryana, Herald, James, ...
We use the Galaxy Evolution Explorer (GALEX) Medium and All-Sky-Imaging Survey (MIS & AIS) data from the first public data release (GR1), matched to the Sloan Digital Sky Survey (SDSS) DR3 catalog,...
Ongoing Formation of Bulges and Black Holes in the Local Universe: New Insights from GALEX (2006)
Kauffmann, Guinevere, Heckman, Timothy M., Budavari, Tamas, Charlot, Stephane, Hoopes, Charles G., Martin, D. Christopher, ...
We analyze a volume-limited sample of massive bulge-dominated galaxies with data from both the Sloan Digital Sky Survey and the Galaxy Evolution Explorer (GALEX) satellite. The galaxies have central...
Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars (2006)
Richards, Gordon T., Lacy, Mark, Storrie-Lombardi, Lisa J., Hall, Patrick B., Gallagher, S. C., Hines, Dean C., ...
We present an analysis of the mid-infrared (MIR) and optical properties of type 1 (broad-line) quasars detected by the Spitzer Space Telescope. The MIR color-redshift relation is characterized to...
Galaxy bimodality versus stellar mass and environment (2006)
Baldry, Ivan K., Balogh, Michael L., Bower, Richard G., Glazebrook, Karl, Nichol, Robert C., Bamford, S. P., ...
Abstract not available.
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, 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...
Galaxy bimodality versus stellar mass and environment (2006)
Baldry, Ivan K., Balogh, Michael L., Bower, Richard G., Glazebrook, Karl, Nichol, Robert C., Bamford, S. P., ...
Abstract not available.
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, 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...
Cosmological constraints from the SDSS luminous red galaxies (2006)
Tegmark, Max, Eisenstein, Daniel J., Strauss, Michael A., Weinberg, David H., Blanton, Michael R., Frieman, Joshua A., ...
We measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological...
Cosmological constraints from the SDSS luminous red galaxies (2006)
Tegmark, Max, Eisenstein, Daniel J., Strauss, Michael A., Weinberg, David H., Blanton, Michael R., Frieman, Joshua A., ...
We measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological...
Galaxy bimodality versus stellar mass and environment (2006)
Baldry, Ivan K., Balogh, Michael L., Bower, Richard G., Glazebrook, Karl, Nichol, Robert C., Bamford, S. P., ...
Abstract not available.
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, 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...
Cosmological constraints from the SDSS luminous red galaxies (2006)
Tegmark, Max, Eisenstein, Daniel J., Strauss, Michael A., Weinberg, David H., Blanton, Michael R., Frieman, Joshua A., ...
We measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological...
Photometric Covariance in Multi-Band Surveys: Understanding the Photometric Error in the SDSS (2005)
Scranton, Ryan, Connolly, Andrew J., Szalay, Alexander S., Lupton, Robert H., Johnston, David, Budavari, Tamas, ...
In this paper we describe a detailed analysis of the photometric uncertainties present within the Sloan Digital Sky Survey (SDSS) imaging survey based on repeat observations of approximately 200...
Calibrating photometric redshifts of luminous red galaxies (2005)
Padmanabhan, Nikhil, Budavari, Tamas, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, ...
We discuss the construction of a photometric redshift catalogue of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, 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,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, 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,...
The Sloan Digital Sky Survey u-band galaxy survey: luminosity functions and evolution (2005)
Baldry, Ivan K., Glazebrook, Karl, Budavari, Tamas, Eisenstein, Daniel J., Annis, James, Bahcall, Neta A., ...
We construct and analyse a u-band selected galaxy sample from the Sloan Digital Sky Survey (SDSS) Southern Survey, which covers 275 deg 2. The sample includes 43 223 galaxies with spectroscopic...
The Sloan Digital Sky Survey u-band galaxy survey: luminosity functions and evolution (2005)
Baldry, Ivan K., Glazebrook, Karl, Budavari, Tamas, Eisenstein, Daniel J., Annis, James, Bahcall, Neta A., ...
We construct and analyse a u-band selected galaxy sample from the Sloan Digital Sky Survey (SDSS) Southern Survey, which covers 275 deg 2. The sample includes 43 223 galaxies with spectroscopic...
Calibrating photometric redshifts of luminous red galaxies (2005)
Padmanabhan, Nikhil, Budavari, Tamas, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, ...
We discuss the construction of a photometric redshift catalogue of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, 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,...
The Sloan Digital Sky Survey u-band galaxy survey: luminosity functions and evolution (2005)
Baldry, Ivan K., Glazebrook, Karl, Budavari, Tamas, Eisenstein, Daniel J., Annis, James, Bahcall, Neta A., ...
We construct and analyse a u-band selected galaxy sample from the Sloan Digital Sky Survey (SDSS) Southern Survey, which covers 275 deg 2. The sample includes 43 223 galaxies with spectroscopic...
Weinstein, Michael A., Richards, Gordon T., Schneider, Donald P., Younger, Joshua D., Strauss, Michael A., Hall, Patrick B., ...
We present an empirical algorithm for obtaining photometric redshifts of quasars using 5-band Sloan Digital Sky Survey (SDSS) photometry. Our algorithm generates an empirical model of the quasar...
Calibrating Photometric Redshifts of Luminous Red Galaxies (2004)
Padmanabhan, Nikhil, Budavari, Tamas, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, ...
We discuss the construction of a photometric redshift catalogue of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing...
Distributions of Galaxy Spectral Types in the Sloan Digital Sky Survey (2004)
Yip, Ching-Wa, Connolly, Andrew, Szalay, Alex, Budavari, Tamas, SubbaRao, Mark, Frieman, Joshua, ...
We perform an objective classification of 170,000 galaxy spectra in the Sloan Digital Sky Survey (SDSS) using the Karhunen-Lo\`eve (KL) transform. With about one-sixth of the total set of galaxy...
Extending the SDSS Batch Query System to the National Virtual Observatory Grid (2004)
Nieto-Santisteban, Maria A., O'Mullane, William, Gray, Jim, Li, Nolan, Budavari, Tamas, Szalay, Alexander S., ...
The Sloan Digital Sky Survey science database is approaching 2TB. While the vast majority of queries normally execute in seconds or minutes, this interactive execution time can be disproportionately...
Galaxy-galaxy weak lensing in SDSS: intrinsic alignments and shear calibration errors (2004)
Hirata, Christopher M., Mandelbaum, Rachel, Seljak, Uros, Guzik, Jacek, Padmanabhan, Nikhil, Blake, Cullen, ...
Galaxy-galaxy lensing has emerged as a powerful probe of the dark matter halos of galaxies, but is subject to contamination if intrinsically aligned satellites of the lens galaxy are used as part of...
Cosmological Parameters from Eigenmode Analysis of Sloan Digital Sky Survey Galaxy Redshifts (2004)
Pope, Adrian C., Matsubara, Takahiko, Szalay, Alexander S., Blanton, Michael R., Eisenstein, Daniel J., Gray, Jim, ...
We present estimates of cosmological parameters from the application of the Karhunen-Loeve transform to the analysis of the 3D power spectrum of density fluctuations using Sloan Digital Sky Survey...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., 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 deg(2) of five-band (ugriz) imaging data with photometry for...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., 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 deg(2) of five-band (ugriz) imaging data with photometry for...
Conti, Alberto, Connolly, Andrew J., Hopkins, Andrew M., Budavari, Tamas, Szalay, Alex S., Csabai, Istvan, ...
We analyze the photometric information contained in individual pixels of galaxies in the Hubble Deep Field North (HDFN) using a new technique, _pixel-z_, that combines predictions of evolutionary...
Budavari, Tamas, Connolly, Andrew J., Szalay, Alexander S., Szapudi, Istvan, Csabai, Istvan, Scranton, Ryan, ...
Understanding the clustering of galaxies has long been a goal of modern observational cosmology. Utilizing our photometric redshift technique a volume limited sample containing more than 2 million...
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...
The first data release of the Sloan Digital Sky Survey (2003)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its First Data Release. This consists of 2099 deg2 of five-band (u, g, r, i, z) imaging data, 186,240 spectra of...
SkyQuery: A Web Service Approach to Federate Databases (2003)
Tanu Malik, Alex S. Szalay, Tamas Budavari, Ani R. Thakar
Traditional science searched for new objects and phenomena that led to discoveries. Tomorrow's science will combine together the large pool of information in scientific archives and make...
Grid-Based Galaxy Morphology Analysis for the National Virtual Observatory (2003)
Ewa Deelman, Raymond Plante, Carl Kesselman, Gurmeet Singh, Mei-hui Su, Gretchen Greene, ...
As part of the development of the National Virtual Observatory (NVO), a Data Grid for astronomy, we have developed a prototype science application to explore the dynamical history of galaxy clusters...
The first data release of the Sloan Digital Sky Survey (2003)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its First Data Release. This consists of 2099 deg2 of five-band (u, g, r, i, z) imaging data, 186,240 spectra of...
The Evolution of the Global Stellar Mass Density at 0 < z < 3 (2002)
Dickinson, Mark, Papovich, Casey, Ferguson, Henry C., Budavari, Tamas
The build-up of stellar mass in galaxies is the consequence of their past star formation and merging histories. Here we report measurements of rest-frame optical light and calculations of stellar...
SkyQuery: A WebService Approach to Federate Databases (2002)
Malik, Tanu, Szalay, Alex S., Budavari, Tamas, Thakar, Ani R.
Traditional science searched for new objects and phenomena that led to discoveries. Tomorrow's science will combine together the large pool of information in scientific archives and make discoveries....
Photometric Redshifts for the SDSS Early Data Release (2002)
Csabai, Istvan, Budavari, Tamas, Connolly, Andrew J., Szalay, Alexander S., Gyory, Zsuzsanna, Benitez, Narciso, ...
The Early Data Release from the Sloan Digital Sky survey provides one of the largest multicolor photometric catalogs currently available to the astronomical community. In this paper we present the...
Web Services for the Virtual Observatory (2002)
Szalay, Alexander S., Budavari, Tamas, Malika, Tanu, Gray, Jim, Thakara, Ani
Web Services form a new, emerging paradigm to handle distributed access to resources over the Internet. There are platform independent standards (SOAP, WSDL), which make the developers? task...
Spatial Clustering of Galaxies in Large Datasets (2002)
Szalay, Alexander S., Budavari, Tamas, Connolly, Andrew, Gray, Jim, Matsubara, Takahiko, Pope, Adrian, ...
Datasets with tens of millions of galaxies present new challenges for the analysis of spatial clustering. We have built a framework that integrates a database of object catalogs, tools for creating...
The 3D Power Spectrum from Angular Clustering of Galaxies in Early SDSS Data (2001)
Dodelson, Scott, Narayanan, Vijay K., Tegmark, Max, Scranton, Ryan, Budavari, Tamas, Connolly, Andrew, ...
Early photometric data from the Sloan Digital Sky Survey (SDSS) contain angular positions for 1.5 million galaxies. In companion papers, the angular correlation function $w(\theta)$ and 2D power...
Optimal multihump filter for photometric redshifts (2001)
Budavari, Tamas, Szalay, Alexander S., Csabai, Istvan, Connolly, Andrew J., Tsvetanov, Zlatan
We propose a novel type filter for multicolor imaging to improve on the photometric redshift estimation of galaxies. An extra filter - specific to a certain photometric system - may be utilized with...
Photometric redshifts from reconstructed QSO templates (2001)
Budavari, Tamas, Csabai, Istvan, Szalay, Alexander S., Connolly, Andrew J., Szokoly, Gyula P.
From SDSS commissioning photometric and spectroscopic data, we investigate the utility of photometric redshift techniques to the task of estimating QSO redshifts. We consider empirical methods (e.g....
Riess, Adam G., Nugent, Peter E., Schmidt, Brian P., Tonry, John, Dickinson, Mark, Gilliland, Ronald L., ...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of ~1.7, the farthest SN observed to date. SN 1997ff, was discovered in a repeat observation by the HST of...
Riess, Adam G., Nugent, Peter E., Schmidt, Brian P., Tonry, John, Dickinson, Mark, Gilliland, Ronald L., ...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of approximately 1.7, the farthest SN observed to date. The supernova, SN 1997, was discovered in a repeat...
Spectral Templates from Multicolor Redshift Surveys (2000)
Budavari, Tamas, Szalay, Alexander S., Connolly, Andrew J., Csabai, Istvan, Dickinson, Mark E.
Understanding how the physical properties of galaxies (e.g. their spectral type or age) evolve as a function of redshift relies on having an accurate representation of galaxy spectral energy...
Creating Spectral Templates from Multicolor Redshift Surveys (1999)
Budavari, Tamas, Szalay, Alex S., Connolly, Andrew J., Csabai, Istvan, Dickinson, Mark E.
We present a novel method capable of creating optimal eigenspectra from multicolor redshift surveys for photometric redshift estimation. Our iterative training algorithm modifies the templates to...