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1. Extreme ultraviolet quasar colours from GALEX observations of the SDSS DR14Q catalogue.

Author

Vanden Berk, Daniel E, Wesolowski, Sarah C, Yeckley, Mary J, Marcinik, Joseph M, Quashnock, Jean M, Machia, Lawrence M, and Wu, Jian

Subjects
*QUASARS, *COLOR, *DETECTION limit, *CATALOGS, *SKEWNESS (Probability theory)
Abstract

The rest-frame far to extreme ultraviolet (UV) colour–redshift relationship has been constructed from data on over |$480\, 000$| quasars carefully cross-matched between SDSS Data Release 14 and the final GALEX  photometric catalogue. UV matching and detection probabilities are given for all the quasars, including dependencies on separation, optical brightness, and redshift. Detection limits are also provided for all objects. The UV colour distributions are skewed redward at virtually all redshifts, especially when detection limits are accounted for. The median GALEX  far-UV minus near-UV (FUV − NUV) colour–redshift relation is reliably determined up to z ≈ 2.8, corresponding to rest-frame wavelengths as short as 400 Å. Extreme UV (EUV) colours are substantially redder than found previously, when detection limits are properly accounted for. Quasar template spectra were forward modelled through the GALEX  bandpasses, accounting for intergalactic opacity, intrinsic reddening, and continuum slope variations. Intergalactic absorption by itself cannot account for the very red EUV colours. The colour–redshift relation is consistent with no intrinsic reddening, at least for SMC-like extinction. The best model fit has a FUV continuum power-law slope αν, FUV = −0.34 ± 0.03 consistent with previous results, but an EUV slope αν, EUV = −2.90 ± 0.04 that is much redder and inconsistent with any previous composite value (all ≳ −2.0). The EUV slope difference can be attributed in part to the tendency of previous studies to preferentially select UV brighter and bluer objects. The weak EUV flux suggests quasar accretion disc models that include outflows such as disc winds. [ABSTRACT FROM AUTHOR]

Published
2020
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2. The Sixth Data Release of the Sloan Digital Sky Survey

Author

Adelman‐McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, Anderson, Kurt S.J., Anderson, Scott F., Annis, James, Bahcall, Neta A., Bailer‐Jones, C. A. L., Baldry, Ivan K., Barentine, J. C., Bassett, Bruce A., Becker, Andrew C., Beers, Timothy C., Bell, Eric F., Berlind, Andreas A., Bernardi, Mariangela, Blanton, Michael R., Bochanski, John J., Boroski, William N., Brinchmann, Jarle, Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Carliles, Samuel, Carr, Michael A., Castander, Francisco J., Cinabro, David, Cool, R. J., Covey, Kevin R., Csabai, István, Cunha, Carlos E., Davenport, James R. A., Dilday, Ben, Doi, Mamoru, Eisenstein, Daniel James, Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gänsicke, Boris T., Gates, Evalyn, Gillespie, Bruce, Glazebrook, Karl, Gray, Jim, Grebel, Eva K., Gunn, James E., Gurbani, Vijay K., Hall, Patrick B., Harding, Paul, Harvanek, Michael, Hawley, Suzanne L., Hayes, Jeffrey, Heckman, Timothy M., Hendry, John S., Hindsley, Robert B., Hirata, Christopher M., Hogan, Craig J., Hogg, David W., Hyde, Joseph B., Ichikawa, Shin‐ichi, Ivezi?, ?eljko, Jester, Sebastian, Johnson, Jennifer A., Jorgensen, Anders M., Juric, Mario, Kent, Stephen M., Kessler, R., Kleinman, S. J., Knapp, G. R., Kron, Richard G., Krzesinski, Jurek, Kuropatkin, Nikolay, Lamb, Donald Q., Lampeitl, Hubert, Lebedeva, Svetlana, Lee, Young Sun, Leger, R. French, Lépine, Sébastien, Lima, Marcos, Lin, Huan, Long, Daniel C., Loomis, Craig P., Loveday, Jon, Lupton, Robert H., Malanushenko, Olena, Malanushenko, Viktor, Mandelbaum, Rachel, Margon, Bruce, Marriner, John P., Martínez‐Delgado, David, Matsubara, Takahiko, McGehee, Peregrine M., McKay, Timothy A., Meiksin, Avery, Morrison, Heather L., Munn, Jeffrey A., Nakajima, Reiko, Neilsen, Eric H. Jr., Newberg, Heidi Jo, Nichol, Robert C., Nicinski, Tom, Nieto‐Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, Owen, Russell, Oyaizu, Hiroaki, Padmanabhan, Nikhil, Pan, Kaike, Park, Changbom, Peoples, Jr., John, Pier, Jeffrey R., Pope, Adrian C., Purger, Norbert, Raddick, M. Jordan, Re Fiorentin, Paola, Richards, Gordon T., Richmond, Michael W., Riess, Adam G., Rix, Hans‐Walter, Rockosi, Constance M., Sako, Masao, Schlegel, David J., Schneider, Donald P., Schreiber, Matthias R., Schwope, Axel D., Seljak, Uros, Sesar, Branimir, Sheldon, Erin, Shimasaku, Kazu, Sivarani, Thirupathi, Smith, J. Allyn, Snedden, Stephanie A., Steinmetz, Matthias, Strauss, Michael A., SubbaRao, Mark, Suto, Yasushi, Szalay, Alexander S., Szapudi, István, Szkody, Paula, Tegmark, Max, Thakar, Aniruddha R., Tremonti, Christy A., Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Vandenberg, Jan, Vidrih, S., Vogeley, Michael S., Voges, Wolfgang, Vogt, Nicole P., Wadadekar, Yogesh, Weinberg, David H., West, Andrew A., White, Simon D. M., Wilhite, Brian C., Yanny, Brian, Yocum, D. R., York, Donald G., Zehavi, Idit, and Zucker, Daniel B.

Subjects
atlases, catalogs, surveys
Abstract

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 parameters of roughly 287 million objects over 9583 deg2, including scans over a large range of Galactic latitudes and longitudes. The survey also includes 1.27 million spectra of stars, galaxies, quasars, and blank sky (for sky subtraction) selected over 7425 deg2. This release includes much more stellar spectroscopy than was available in previous data releases and also includes detailed estimates of stellar temperatures, gravities, and metallicities. The results of improved photometric calibration are now available, with uncertainties of roughly 1% in g, r, i, and z, and 2% in u, substantially better than the uncertainties in previous data releases. The spectra in this data release have improved wavelength and flux calibration, especially in the extreme blue and extreme red, leading to the qualitatively better determination of stellar types and radial velocities. The spectrophotometric fluxes are now tied to point-spread function magnitudes of stars rather than fiber magnitudes. This gives more robust results in the presence of seeing variations, but also implies a change in the spectrophotometric scale, which is now brighter by roughly 0.35 mag. Systematic errors in the velocity dispersions of galaxies have been fixed, and the results of two independent codes for determining spectral classifications and redshifts are made available. Additional spectral outputs are made available, including calibrated spectra from individual 15 minute exposures and the sky spectrum subtracted from each exposure. We also quantify a recently recognized underestimation of the brightnesses of galaxies of large angular extent due to poor sky subtraction; the bias can exceed 0.2 mag for galaxies brighter than r = 14 mag., Astronomy

Published
2008
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3. The Third Data Release of the Sloan Digital Sky Survey

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, Bahcall, Neta A., Baldry, Ivan K., Bastian, Steven, Berlind, Andreas, Bernardi, Mariangela, Blanton, Michael R., Bochanski, John J. Jr., Boroski, William N., Brewington, Howard J., Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Carey, Larry N., Castander, Francisco J., Connolly, A. J., Covey, Kevin R., Csabai, István, Dalcanton, Julianne J., Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gillespie, Bruce, Glazebrook, Karl, Gray, Jim, Grebel, Eva K., Gunn, James E., Gurbani, Vijay K., Hall, Patrick B., Hamabe, Masaru, Harbeck, Daniel, Harris, Frederick H., Harris, Hugh C., Harvanek, Michael, Hawley, Suzanne L., Hayes, Jeffrey, Heckman, Timothy M., Hendry, John S., Hennessy, Gregory S., Hindsley, Robert B., Hogan, Craig J., Hogg, David W., Holmgren, Donald J., Holtzman, Jon A., Ichikawa, Shin-ichi, Ichikawa, Takashi, Ivezic, Zeljko, Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Juri?, Mario, Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Yu., Kron, Richard G., Krzesinski, Jurek, Lamb, Donald Q., Lampeitl, Hubert, Lee, Brian C., Lin, Huan, Long, Daniel C., Loveday, Jon, Lupton, Robert H., Mannery, Ed, Margon, Bruce, Martínez-Delgado, David, Matsubara, Takahiko, McGehee, Peregrine M., McKay, Timothy A., Meiksin, Avery, Ménard, Brice, Munn, Jeffrey A., Nash, Thomas, Neilsen, Eric H. Jr., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, O, William, Owen, Russell, Padmanabhan, Nikhil, Pauls, George, Peoples, John, Pier, Jeffrey R., Pope, Adrian C., Pourbaix, Dimitri, Quinn, Thomas R., Raddick, M. Jordan, Richards, Gordon T., Richmond, Michael W., Rix, Hans-Walter, Rockosi, Constance M., Schlegel, David J., Schneider, Donald P., Schroeder, Joshua, Scranton, Ryan, Sekiguchi, Maki, Sheldon, Erin, Shimasaku, Kazu, Silvestri, Nicole M., Smith, J. Allyn, Smol?i?, Vernesa, Snedden, Stephanie A., Stebbins, Albert, Stoughton, Chris, Strauss, Michael A., SubbaRao, Mark, Szalay, Alexander S., Szapudi, István, Szkody, Paula, Szokoly, Gyula P., Tegmark, Max, Teodoro, Luis, Thakar, Aniruddha R., Tremonti, Christy, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Vandenberg, Jan, Vogeley, Michael S., Voges, Wolfgang, Vogt, Nicole P., Walkowicz, Lucianne M., Wang, Shu-i, Weinberg, David H., West, Andrew A., White, Simon D. M., Wilhite, Brian C., Xu, Yongzhong, Yanny, Brian, Yasuda, Naoki, Yip, Ching-Wa, Yocum, D. R., York, Donald G., Zehavi, Idit, Zibetti, Stefano, and Zucker, Daniel B.

Subjects
atlases, catalogs, surveys
Abstract

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, photometric and astrometric catalogs of the 141 million objects detected in these imaging data, and spectra of 528,640 objects selected over 4188 deg2. The pipelines analyzing both images and spectroscopy are unchanged from those used in our Second Data Release., Astronomy

Published
2005
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4. The Second Data Release of the Sloan Digital Sky Survey

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt, S. J., Anderson, Scott F., Annis, James, Bahcall, Neta A., Baldry, Ivan K., Bastian, Steven, Berlind, Andreas, Bernardi, Mariangela, Blanton, Michael R., Bochanski, John J. Jr., Boroski, William N., Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Carey, Larry N., Carliles, Samuel, Castander, Francisco J., Connolly, A. J., Csabai, István, Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gal, Roy R., Gillespie, Bruce, Glazebrook, Karl, Gray, Jim, Grebel, Eva K., Gunn, James E., Gurbani, Vijay K., Hall, Patrick B., Hamabe, Masaru, Harris, Frederick H., Harris, Hugh C., Harvanek, Michael, Heckman, Timothy M., Hendry, John S., Hennessy, Gregory S., Hindsley, Robert B., Hogan, Craig J., Hogg, David W., Holmgren, Donald J., Ichikawa, Shin-ichi, Ichikawa, Takashi, Ivezic, Zeljko, Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Yu., Kron, Richard G., Krzesinski, Jurek, Kunszt, Peter Z., Kuropatkin, Nickolai, Lamb, Donald Q., Lampeitl, Hubert, Lee, Brian C., Leger, R. French, Li, Nolan, Lin, Huan, Loh, Yeong-Shang, Long, Daniel C., Loveday, Jon, Lupton, Robert H., Malik, Tanu, Margon, Bruce, Matsubara, Takahiko, McGehee, Peregrine M., McKay, Timothy A., Meiksin, Avery, Munn, Jeffrey A., Nakajima, Reiko, Nash, Thomas, Neilsen, Eric H. Jr., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, O, William, Ostriker, Jeremiah P., Owen, Russell, Padmanabhan, Nikhil, Peoples, John, Pier, Jeffrey R., Pope, Adrian C., Quinn, Thomas R., Richards, Gordon T., Richmond, Michael W., Rix, Hans-Walter, Rockosi, Constance M., Schlegel, David J., Schneider, Donald P., Scranton, Ryan, Sekiguchi, Maki, Seljak, Uros, Sergey, Gary, Sesar, Branimir, Sheldon, Erin, Shimasaku, Kazu, Siegmund, Walter A., Silvestri, Nicole M., Smith, J. Allyn, Smolčić, Vernesa, Snedden, Stephanie A., Stebbins, Albert, Stoughton, Chris, Strauss, Michael A., SubbaRao, Mark, Szalay, Alexander S., Szapudi, István, Szkody, Paula, Szokoly, Gyula P., Tegmark, Max, Teodoro, Luis, Thakar, Aniruddha R., Tremonti, Christy, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Vandenberg, Jan, Vogeley, Michael S., Voges, Wolfgang, Vogt, Nicole P., Walkowicz, Lucianne M., Wang, Shu-i, Weinberg, David H., West, Andrew A., White, Simon D. M., Wilhite, Brian C., Xu, Yongzhong, Yanny, Brian, Yasuda, Naoki, Yip, Ching-Wa, Yocum, D. R., York, Donald G., Zehavi, Idit, Zibetti, Stefano, and Zucker, Daniel B.

Subjects
atlases, catalogs, surveys
Abstract

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 over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg2 of this area, and tables of measured parameters from these data. The imaging data reach a depth of r ≈ 22.2 (95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 Å at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them., Astronomy

Published
2004
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5. Sloan Digital Sky Survey Imaging of Low Galactic Latitude Fields: Technical Summary and Data Release

Author

Finkbeiner, Douglas, Padmanabhan, Nikhil, Schlegel, David J., Carr, Michael A., Gunn, James E., Rockosi, Constance M., Sekiguchi, Maki, Lupton, Robert H., Knapp, G. R., Ivezic, Zeljko, Blanton, Michael R., Hogg, David W., Adelman-McCarthy, Jennifer K., Annis, James, Hayes, Jeffrey, Kinney, Ellynne, Long, Daniel C., Seljak, Uros, Strauss, Michael A., Yanny, Brian, Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Bahcall, Neta A., Baldry, Ivan K., Bernardi, Mariangela, Boroski, William N., Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Castander, Francisco J., Covey, Kevin R., Csabai, István, Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Fan, Xiaohui, Friedman, Scott D., Fukugita, Masataka, Gillespie, Bruce, Grebel, Eva K., Gurbani, Vijay K., de Haas, Ernst, Harris, Frederick H., Hendry, John S., Hennessy, Gregory S., Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Juric, Mario, Kent, Stephen M., Kniazev, Alexei Yu., Krzesinski, Jurek, Leger, R. French, Lin, Huan, Loveday, Jon, Mannery, Ed, Martínez-Delgado, David, McGehee, Peregrine M., Meiksin, Avery, Munn, Jeffrey A., Neilsen, Eric H. Jr., Newman, Peter R., Nitta, Atsuko, Pauls, George, Quinn, Thomas R., Rafikov, R. R., Richards, Gordon T., Richmond, Michael W., Schneider, Donald P., Schroeder, Joshua, Shimasaku, Kazu, Siegmund, Walter A., Smith, J. Allyn, Snedden, Stephanie A., Stebbins, Albert, Szalay, Alexander S., Szokoly, Gyula P., Tegmark, Max, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Weinberg, David H., West, Andrew A., Yasuda, Naoki, Yocum, D. R., York, Donald G., and Zehavi, Idit

Subjects
atlases, catalogs, surveys
Abstract

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 data were obtained during commissioning and subsequent testing of the SDSS observing system, and they provide unique wide-area imaging data in regions of high obscuration and star formation, including numerous young stellar objects, Herbig-Haro objects, and young star clusters. Because these data are outside the survey regions in the Galactic caps, they are not part of the standard SDSS data releases. This paper presents imaging data for 832 square degrees of sky (including repeats), in the star-forming regions of Orion, Taurus, and Cygnus. About 470 deg2 are now released to the public, with the remainder to follow at the time of SDSS Data Release 4. The public data in Orion include the star-forming region NGC 2068/NGC 2071/HH 24 and a large part of Barnard's loop., Astronomy

Published
2004
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6. The First Data Release of the Sloan Digital Sky Survey

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Ageros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, Bahcall, Neta A., Baldry, Ivan K., Bastian, Steven, Berlind, Andreas, Bernardi, Mariangela, Blanton, Michael R., Blythe, Norman, Bochanski, John J. Jr., Boroski, William N., Brewington, Howard, Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavri, Tams, Carey, Larry N., Carr, Michael A., Castander, Francisco J., Chiu, Kuenley, Collinge, Matthew J., Connolly, A. J., Covey, Kevin R., Csabai, Istvn, Dalcanton, Julianne J., Dodelson, Scott, Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Evans, Michael L., Fan, Xiaohui, Feldman, Paul D., Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gal, Roy R., Gillespie, Bruce, Glazebrook, Karl, Gonzalez, Carlos F., Gray, Jim, Grebel, Eva K., Grodnicki, Lauren, Gunn, James E., Gurbani, Vijay K., Hall, Patrick B., Hao, Lei, Harbeck, Daniel, Harris, Frederick H., Harris, Hugh C., Harvanek, Michael, Hawley, Suzanne L., Heckman, Timothy M., Helmboldt, J. F., Hendry, John S., Hennessy, Gregory S., Hindsley, Robert B., Hogg, David W., Holmgren, Donald J., Holtzman, Jon A., Homer, Lee, Hui, Lam, Ichikawa, Shin-ichi, Ichikawa, Takashi, Inkmann, John P., Ivezic, Zeljko, Jester, Sebastian, Johnston, David E., Jordan, Beatrice, Jordan, Wendell P., Jorgensen, Anders M., Juri, Mario, Kauffmann, Guinevere, Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Y., Kron, Richard G., Krzesiski, Jurek, Kunszt, Peter Z., Kuropatkin, Nickolai, Lamb, Donald Q., Lampeitl, Hubert, Laubscher, Bryan E., Lee, Brian C., Leger, R. French, Li, Nolan, Lidz, Adam, Lin, Huan, Loh, Yeong-Shang, Long, Daniel C., Loveday, Jon, Lupton, Robert H., Malik, Tanu, Margon, Bruce, McGehee, Peregrine M., McKay, Timothy A., Meiksin, Avery, Miknaitis, Gajus A., Moorthy, Bhasker K., Munn, Jeffrey A., Murphy, Tara, Nakajima, Reiko, Narayanan, Vijay K., Nash, Thomas, Neilsen, Eric H. Jr., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Odenkirchen, Michael, Okamura, Sadanori, Ostriker, Jeremiah P., Owen, Russell, Padmanabhan, Nikhil, Peoples, John, Pier, Jeffrey R., Pindor, Bartosz, Pope, Adrian C., Quinn, Thomas R., Rafikov, R. R., Raymond, Sean N., Richards, Gordon T., Richmond, Michael W., Rix, Hans-Walter, Rockosi, Constance M., Schaye, Joop, Schlegel, David J., Schneider, Donald P., Schroeder, Joshua, Scranton, Ryan, Sekiguchi, Maki, Seljak, Uro, Sergey, Gary, Sesar, Branimir, Sheldon, Erin, Shimasaku, Kazu, Siegmund, Walter A., Silvestri, Nicole M., Sinisgalli, Allan J., Sirko, Edwin, Smith, J. Allyn, Smoli, Vernesa, Snedden, Stephanie A., Stebbins, Albert, Steinhardt, Charles, Stinson, Gregory, Stoughton, Chris, Strateva, Iskra V., Strauss, Michael A., SubbaRao, Mark, Szalay, Alexander S., Szapudi, Istvn, Szkody, Paula, Tasca, Lidia, Tegmark, Max, Thakar, Aniruddha R., Tremonti, Christy, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Vandenberg, Jan, Vogeley, Michael S., Voges, Wolfgang, Vogt, Nicole P., Walkowicz, Lucianne M., Weinberg, David H., West, Andrew A., White, Simon D. M., Wilhite, Brian C., Willman, Beth, Xu, Yongzhong, Yanny, Brian, Yarger, Jean, Yasuda, Naoki, Yip, Ching-Wa, Yocum, D. R., York, Donald G., Zakamska, Nadia L., Zehavi, Idit, Zheng, Wei, Zibetti, Stefano, and Zucker, Daniel B.

Subjects
atlases, catalogs, surveys
Abstract

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 galaxies, quasars, stars and calibrating blank sky patches selected over 1360 deg2 of this area, and tables of measured parameters from these data. The imaging data go to a depth of r ≈ 22.6 and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The spectra cover the range 3800–9200 Å, with a resolution of 1800–2100. This paper describes the characteristics of the data with emphasis on improvements since the release of commissioning data (the SDSS Early Data Release) and serves as a pointer to extensive published and on-line documentation of the survey., Astronomy

Published
2003
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7. Colors of 2625 Quasars at 0 < z < 5 Measured in the Sloan Digital Sky Survey Photometric System

Author

Richards, Gordon T., Fan, Xiaohui, Schneider, Donald P., Vanden Berk, Daniel E., Strauss, Michael A., York, Donald G., Anderson, Jr., John E., Anderson, Scott F., Annis, James, Bahcall, Neta A., Bernardi, Mariangela, Briggs, John W., Brinkmann, J., Brunner, Robert, Burles, Scott, Carey, Larry, Castander, Francisco J., Connolly, A. J., Crocker, J. H., Csabai, István, Doi, Mamoru, Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gunn, James E., Hindsley, Robert B., Ivezic, Zeljko, Kent, Stephen, Knapp, G. R., Lamb, D. Q., Leger, R. French, Long, Daniel C., Loveday, Jon, Lupton, Robert H., McKay, Timothy A., Meiksin, Avery, Merrelli, Aronne, Munn, Jeffrey A., Newberg, Heidi Jo, Newcomb, Matt, Nichol, R. C., Owen, Russell, Pier, Jeffrey R., Pope, Adrian, Richmond, Michael W., Rockosi, Constance M., Schlegel, David J., Siegmund, Walter A., Smee, Stephen, Snir, Yehuda, Stoughton, Chris, Stubbs, Christopher William, SubbaRao, Mark, Szalay, Alexander S., Szokoly, Gyula P., Tremonti, Christy, Uomoto, Alan, Waddell, Patrick, Yanny, Brian, and Zheng, Wei

Subjects
catalogs, quasars: general, surveys
Abstract

We present an empirical investigation of the colors of quasars in the Sloan Digital Sky Survey (SDSS) photometric system. The sample studied includes 2625 quasars with SDSS photometry: 1759 quasars found during SDSS spectroscopic commissioning and SDSS follow-up observations on other telescopes, 50 matches to FIRST quasars, 573 matches to quasars from the NASA Extragalactic Database, and 243 quasars from two or more of these sources. The quasars are distributed in a 2fdg5 wide stripe centered on the celestial equator covering ~529 deg2. Positions (accurate to 0farcs2) and SDSS magnitudes are given for the 898 quasars known prior to SDSS spectroscopic commissioning. New SDSS quasars, which range in brightness from i* = 15.39 to the photometric magnitude limit of the survey, represent an increase of over 200% in the number of known quasars in this area of the sky. The ensemble average of the observed colors of quasars in the SDSS passbands are well represented by a power-law continuum with αν = -0.5 (fν ∝ να) and are close to those predicted by previous simulations. However, the contributions of the "small blue (or λ3000) bump" and other strong emission lines have a significant effect upon the colors. The color-redshift relation exhibits considerable structure, which may be of use in determining photometric redshifts for quasars from their colors alone. The range of colors at a given redshift can generally be accounted for by a range in the optical spectral index with a distribution αν = -0.5 ± 0.65 (95% confidence), but there is a red tail in the distribution. This tail may be a sign of internal reddening, especially since fainter objects at a given redshift tend to exhibit redder colors than the average. Finally, we show that there is a continuum of properties between quasars and Seyfert galaxies, and we test the validity of the traditional dividing line (MB = -23) between the two classes of active galactic nuclei., Astronomy

Published
2001
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