Host Galaxies of Luminous Type 2 Quasars at z ~ 0.5 (2009)
Liu, Xin, Zakamska, Nadia L., Greene, Jenny E., Strauss, Michael A., Krolik, Julian H., Heckman, Timothy M.
We present deep Gemini GMOS optical spectroscopy of nine luminous quasars at redshifts z ~ 0.5, drawn from the SDSS type 2 quasar sample. Our targets were selected to have high intrinsic luminosities...
The Growth of Black Holes: Insights From Obscured Active Galaxies (2009)
Greene, Jenny E., Zakamska, Nadia L., Liu, Xin, Barth, Aaron J., Ho, Luis C.
Obscured or narrow-line active galaxies offer an unobstructed view of the quasar environment in the presence of a luminous and vigorously accreting black hole. We exploit the large new sample of...
Eight-dimensional mid-infrared/optical Bayesian quasar selection (2009)
Richards, Gordon T., Deo, Rajesh P., Lacy, Mark, Myers, Adam D., Nichol, Robert C., Zakamska, Nadia L., ...
We explore the multidimensional, multiwavelength selection of quasars from mid-infrared (MIR) plus optical data, specifically from Spitzer-Infrared Array Camera (IRAC) and the Sloan Digital Sky...
Eight-Dimensional Mid-Infrared/Optical Bayesian Quasar Selection (2008)
Richards, Gordon T., Deo, Rajesh P., Lacy, Mark, Myers, Adam D., Nichol, Robert C., Zakamska, Nadia L., ...
We explore the multidimensional, multiwavelength selection of quasars from mid-IR (MIR) plus optical data, specifically from Spitzer-IRAC and the Sloan Digital Sky Survey (SDSS). We apply modern...
Mid-infrared spectra of optically selected type 2 quasars (2008)
Zakamska, Nadia L., Gomez, Laura, Strauss, Michael A., Krolik, Julian H.
Type 2 quasars are luminous Active Galactic Nuclei whose central engines are seen through large amounts of gas and dust. We present Spitzer spectra of twelve type 2 quasars selected on the basis of...
Space density of optically-selected type 2 quasars (2008)
Reyes, Reinabelle, Zakamska, Nadia L., Strauss, Michael A., Green, Joshua, Krolik, Julian H., Shen, Yue, ...
Type 2 quasars are luminous active galactic nuclei (AGN) whose central regions are obscured by large amounts of gas and dust. In this paper, we present a catalog of type 2 quasars from the Sloan...
Hot self-similar relativistic MHD flows (2008)
Zakamska, Nadia L., Begelman, Mitchell C., Blandford, Roger D.
We consider axisymmetric relativistic jets with a toroidal magnetic field and an ultrarelativistic equation of state, with the goal of studying the lateral structure of jets whose pressure is matched...
Quasars Probing Quasars I: Optically Thick Absorbers Near Luminous Quasars (2006)
Hennawi, Joseph F., Prochaska, Jason X., Burles, Scott, Strauss, Michael A., Richards, Gordon T., Schlegel, David J., ...
With close pairs of quasars at different redshifts, a background quasar sightline can be used to study a foreground quasar's environment in absorption. We search 149 moderate resolution background...
Zakamska, Nadia L., Strauss, Michael A., Krolik, Julian H., Ridgway, Susan E., Schmidt, Gary D., Smith, Paul S., ...
Type II quasars are luminous Active Galactic Nuclei whose centers are obscured by large amounts of gas and dust. In this paper we present 3-band HST images of nine type II quasars with redshifts 0.2...
Hosts of Type II Quasars: an HST Study (2006)
Zakamska, Nadia L., Strauss, Michael A., Krolik, Julian H., Ridgway, Susan E., Schmidt, Gary D., Smith, Paul S., ...
Type II quasars are luminous Active Galactic Nuclei whose centers are obscured by large amounts of gas and dust. In this contribution we present 3-band HST images of nine type II quasars with...
Collinge, Matthew J., Strauss, Michael A., Hall, Patrick B., Ivezić, Zeljko, Munn, Jeffrey A., Schlegel, David J., ...
Constraints on the acceleration of the solar system from high-precision timing (2005)
Zakamska, Nadia L., Tremaine, Scott
Many astronomers have speculated that the solar system contains undiscovered massive planets or a distant stellar companion. The acceleration of the solar system barycenter can constrain the mass and...
Active Galactic Nuclei in the Sloan Digital Sky Survey: II. Emission-Line Luminosity Function (2005)
Hao, Lei, Strauss, Michael A., Fan, Xiaohui, Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., ...
The emission line luminosity function of active galactic nuclei (AGN) is measured from about 3000 AGN included in the main galaxy sample of the Sloan Digital Sky Survey within a redshift range of $0
Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection (2005)
Hao, Lei, Strauss, Michael A., Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., Kauffmann, Guinevere, ...
We have compiled a large sample of low-redshift active galactic nuclei (AGN) identified via their emission line characteristics from the spectroscopic data of the Sloan Digital Sky Survey. Since...
Zakamska, Nadia L., Schmidt, Gary D., Smith, Paul S., Strauss, Michael A., Krolik, Julian H., Hall, Patrick B., ...
Active galactic nuclei in the sloan digital sky survey. I. Sample selection (2005)
Hao, Lei, Strauss, Michael A., Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., Kauffmann, Guinevere, ...
Active galactic nuclei in the sloan digital sky survey. II. Emission-line luminosity function (2005)
Hao, Lei, Strauss, Michael A., Fan, Xiaohui, Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., ...
Optically identified BL lacertae objects from the sloan digital sky survey (2005)
Collinge, Matthew J., Strauss, Michael A., Hall, Patrick B., Ivezić, Zeljko, Munn, Jeffrey A., Schlegel, David J., ...
Active Galactic Nuclei in the Sloan Digital Sky Survey. I. Sample Selection (2005)
Hao, Lei, Strauss, Michael A., Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., Kauffmann, Guinevere, ...
Strateva, Iskra V., Strauss, Michael A., Hao, Lei, Schlegel, David J., Hall, Pat B., Gunn, James E., ...
Optically identified BL Lacertae objects from the Sloan Digital Sky Survey (2004)
Collinge, Matthew J., Strauss, Michael A., Hall, Patrick B., Ivezic, Zeljko, Munn, Jeffrey A., Schlegel, David J., ...
We present a sample of 386 BL Lacertae (BL Lac) candidates identified from 2860 deg^2 of the Sloan Digital Sky Survey (SDSS) spectroscopic database. The candidates are primarily selected to have...
Candidate Type II Quasars from the SDSS: III. Spectropolarimetry Reveals Hidden Type I Nuclei (2004)
Zakamska, Nadia L., Schmidt, Gary D., Smith, Paul S., Strauss, Michael A., Krolik, Julian H., Hall, P. B., ...
We have conducted spectropolarimetry of 12 type II (obscured) quasar candidates selected from the spectroscopic database of the Sloan Digital Sky Survey based on their emission line properties....
Candidate Type II Quasars from the Sloan Digital Sky Survey: II. From Radio to X-Rays (2004)
Zakamska, Nadia L., Strauss, Michael A., Heckman, Timothy M., Ivezic, Zeljko, Krolik, Julian H.
Type II quasars are luminous AGNs whose central engines and broad-line regions are obscured by intervening material; such objects only recently have been discovered in appreciable numbers. We study...
Excitation and Propagation of Eccentricity Disturbances in Planetary Systems (2004)
Zakamska, Nadia L., Tremaine, Scott
The high eccentricities of the known extrasolar planets remain largely unexplained. We explore the possibility that eccentricities are excited in the outer parts of an extended planetary disk by...
Optically identified BL Lacs from SDSS (2004)
Collinge, Matthew J., Strauss, Michael A., Hall, Patrick B., Ivezić, Zeljiko, Zakamska, Nadia L., Richards, Gordon T., ...
Extrasolar Planet Orbits and Eccentricities (2003)
Tremaine, Scott, Zakamska, Nadia L.
The known extrasolar planets exhibit many interesting and surprising features--extremely short-period orbits, high-eccentricity orbits, mean-motion and secular resonances, etc.--and have dramatically...
Type II Quasars from the SDSS (2003)
Zakamska, Nadia L., Strauss, Michael A., Krolik, Julian H., Heckman, Timothy M.
Type II quasars are suggested by unification models of Active Galactic Nuclei as luminous analogs of Seyfert 2 galaxies. A number of different methods have been used hitherto to discover type II...
Zakamska, Nadia L., Strauss, Michael A., Krolik, Julian H., Collinge, M. J., Hall, P. B., Hao, L., ...
Type II quasars are the long-sought luminous analogs of type II (narrow emission line) Seyfert galaxies, suggested by unification models of active galactic nuclei (AGN) and postulated to account for...
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, ...
Double-peaked low-ionization emission lines in active galactic nuclei (2003)
Strateva, Iskra V., Strauss, Michael A., Hao, Lei, Schlegel, David J., Hall, Pat B., Gunn, James E., ...
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 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 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...
Radiation drag effects on magnetically dominated outflows around compact objects (2002)
Beskin, V. S., Zakamska, Nadia L., Sol, H.
The effects of radiation drag force on the structure of relativistic electron-positron and electron-proton outflows are considered within the one-fluid approximation for quasi-monopole cold outflow....
Models of Galaxy Clusters with Thermal Conduction (2002)
Zakamska, Nadia L., Narayan, Ramesh
We present a simple model of hot gas in galaxy clusters, assuming hydrostatic equilibrium and energy balance between radiative cooling and thermal conduction. For five clusters, A1795, A1835, A2199,...
Optically Identified BL Lacertae Objects From the Sloan Digital Sky Survey (1998)
Collinge, Matthew J., Strauss, Michael A., Hall, Patrick B., Ivezic, Zeljko, Munn, Jeffrey A., Schlegel, David J., ...
We present a sample of 386 BL Lacertae candidates identified from 2860 deg(exp 2) of the Sloan Digital Sky Survey (SDSS) spectroscopic database. The candidates are primarily selected to have...