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8 results on '"Lampeitl, Hubert"'

1. First-Year Spectroscopy for the SDSS-II Supernova Survey

Author

Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, Choi, Changsu, Cinabro, David, DeJongh, Fritz, Depoy, Darren L., Dilday, Ben, Doi, Mamoru, Frieman, Joshua A., Garnavich, Peter M., Hogan, Craig J., Holtzman, Jon, Im, Myungshin, Jha, Saurabh, Kessler, Richard, Konishi, Kohki, Lampeitl, Hubert, Marshall, Jennifer L., McGinnis, David, Miknaitis, Gajus, Nichol, Robert C., Prieto, Jose Luis, Riess, Adam G., Richmond, Michael W., Schneider, Donald P., Smith, Mathew, Takanashi, Naohiro, Tokita, Kouichi, van der Heyden, Kurt, Yasuda, Naoki, Assef, Roberto J., Barentine, John, Bender, Ralf, Blandford, Roger D., Bremer, Malcolm, Brewington, Howard, Collins, Chris A., Crotts, Arlin, Dembicky, Jack, Eastman, Jason, Edge, Alastair, Elson, Ed, Eyler, Michael E., Filippenko, Alexei V., Foley, Ryan J., Frank, Stephan, Goobar, Ariel, Harvanek, Michael, Hopp, Ulrich, Ihara, Yutaka, Kahn, Steven, Ketzeback, William, Kleinman, Scott J., Kollatschny, Wolfram, Krzesiński, Jurek, Leloudas, Giorgos, Long, Daniel C., Lucey, John, Malanushenko, Elena, Malanushenko, Viktor, McMillan, Russet J., Morgan, Christopher W., Morokuma, Tomoki, Nitta, Atsuko, Ostman, Linda, Pan, Kaike, Romer, A. Kathy, Saurage, Gabrelle, Schlesinger, Katie, Snedden, Stephanie A., Sollerman, Jesper, Stritzinger, Maximilian, Watson, Linda C., Watters, Shannon, Wheeler, J. Craig, and York, Donald

Subjects
Astrophysics
Abstract

This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of supernovae in the redshift range z = 0.05 - 0.4, complementing existing surveys at lower and higher redshifts. Our goal is to better characterize the supernova population, with a particular focus on SNe Ia, improving their utility as cosmological distance indicators and as probes of dark energy. Our supernova spectroscopy program features rapid-response observations using telescopes of a range of apertures, and provides confirmation of the supernova and host-galaxy types as well as precise redshifts. We describe here the target identification and prioritization, data reduction, redshift measurement, and classification of 129 SNe Ia, 16 spectroscopically probable SNe Ia, 7 SNe Ib/c, and 11 SNe II from the first season. We also describe our efforts to measure and remove the substantial host galaxy contamination existing in the majority of our SN spectra., Comment: Accepted for publication in The Astronomical Journal(47pages, 9 figures)

Published
2008
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2. A New Survey for Giant Arcs

Author

Hennawi, Joseph F., Gladders, Michael D., Oguri, Masamune, Dalal, Neal, Koester, Benjamin, Natarajan, Priyamvada, Strauss, Michael A., Inada, Naohisa, Kayo, Issha, Lin, Huan, Lampeitl, Hubert, Annis, James, Bahcall, Neta A., and Schneider, Donald P.

Subjects
Astrophysics
Abstract

We report on the first results of an imaging survey to detect strong gravitational lensing targeting the richest clusters selected from the photometric data of the Sloan Digital Sky Survey (SDSS) with follow-up deep imaging observations from the Wisconsin Indiana Yale NOAO (WIYN) 3.5m telescope and the University of Hawaii 88-inch telescope (UH88). The clusters are selected from an area of 8000 deg^2 using the Red Cluster Sequence technique and span the redshift range 0.1 < z < 0.6, corresponding to a comoving cosmological volume of ~ 2 Gpc^3. Our imaging survey thus targets a volume more than an order of magnitude larger than any previous search. A total of 240 clusters were imaged of which 141 had sub-arcsecond image quality. Our survey has uncovered16 new lensing clusters with definite giant arcs, an additional 12 systems for which the lensing interpretation is very likely, and 9 possible lenses which contain shorter arclets or candidate arcs which are less certain and will require further observations to confirm their lensing origin. The number of new cluster lenses detected in this survey is likely > 30. Among these new systems are several of the most dramatic examples of strong gravitational lensing ever discovered with multiple bright arcs at large angular separation. These will likely become 'poster-child' gravitational lenses similar to Abell 1689 and CL0024+1654. The new lenses discovered in this survey will enable future sysetmatic studies of the statistics of strong lensing and its implications for cosmology and our structure formation paradigm., Comment: 19 pages, 7 pages of Figures, submitted to AJ. Fixed Typos

Published
2006
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3. The Fall 2004 SDSS Supernova Survey

Author

Sako, Masao, Romani, Roger, Frieman, Josh, Adelman-McCarthy, Jen, Becker, Andrew, DeJongh, Fritz, Dilday, Ben, Estrada, Juan, Hendry, John, Holtzman, Jon, Kaplan, Jared, Kessler, Rick, Lampeitl, Hubert, Marriner, John, Miknaitis, Gajus, Riess, Adam, Tucker, Douglas, Barentine, J., Blandford, R., Brewington, H., Dembicky, J., Harvanek, M., Hawley, S., Hogan, C., Johnston, D., Kahn, S., Ketzeback, B., Kleinman, S., Krzesinski, J., Lamenti, D., Long, D., McMillan, R., Newman, P., Nitta, A., Nichol, R., Scranton, R., Sheldon, E., Snedden, S., Stoughton, C., York, D., and Collaboration, the SDSS

Subjects
Astrophysics
Abstract

In preparation for the Supernova Survey of the Sloan Digital Sky Survey (SDSS) II, a proposed 3-year extension to the SDSS, we have conducted an early engineering and science run during the fall of 2004, which consisted of approximately 20 scheduled nights of repeated imaging of half of the southern equatorial stripe. Transient supernova-like events were detected in near real-time and photometric measurements were made in the five SDSS filter bandpasses with a cadence of ~2 days. Candidate type Ia supernovae (SNe) were pre-selected based on their colors, light curve shape, and the properties of the host galaxy. Follow-up spectroscopic observations were performed with the Astrophysical Research Consortium 3.5m telescope and the 9.2m Hobby-Eberly Telescope to confirm their types and measure the redshifts. The 2004 campaign resulted in 22 spectroscopically confirmed SNe, which includes 16 type Ia, 5 type II, and 1 type Ib/c. These SN Ia will help fill in the sparsely sampled redshift interval of z = 0.05 - 0.35, the so-called 'redshift desert', in the Hubble diagram. Detailed investigation of the spectral properties of these moderate-redshift SNe Ia will also provide a bridge between local SNe and high-redshift objects, and will help us understand the systematics for future cosmological applications that require high photometric precision. Finally, the large survey volume also provides the opportunity to select unusual supernovae for spectroscopic study that are poorly sampled in other surveys. We report on some of the early results from this program and discuss potential future applications., Comment: 6 pages; Presentation at the 22nd Texas Symposium on Relativistic Astrophysics; minor revisions

Published
2005

4. A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey III: Discovery of Five Additional Quasars

Author

Fan, Xiaohui, Hennawi, Joseph F., Richards, Gordon T., Strauss, Michael A., Schneider, Donald P., Donley, Jennifer L., Young, Jason E., Annis, James, Lin, Huan, Lampeitl, Hubert, Lupton, Robert H., Gunn, James E., Knapp, Gillan R., and Brandt, W. N.

Subjects
Astrophysics
Abstract

We present the discovery of five new quasars at z>5.7, selected from the multicolor imaging data of the Sloan Digital Sky Survey (SDSS). Three of them, at redshifts 5.93, 6.07, and 6.22, were selected from ~1700 deg^2 of new SDSS Main Survey imaging in the Northern Galactic Cap. An additional quasar, at redshift 5.85, was discovered by coadding the data obtained in the Fall Equatorial Stripe in the SDSS Southern Survey Region. The fifth object, at redshift 5.80, is selected from a non-standard SDSS scan in the Southern Galactic Cap outside the Main Survey area. The spectrum of SDSS J162331.81+311200.5 (z=6.22) shows a complete Gunn-Peterson trough at z_abs > 5.95, similar to the troughs detected in other three z>6.2 quasars known. We present a composite spectrum of the z>5.7 quasars discovered in the SDSS to date. The average emission line and continuum properties of z~6 quasars exhibit no significant evolution compared to those at low redshift. Using a complete sample of nine z>5.7 quasars, we find that the density of quasars with M_1450 < -26.7 at z~6 is (6+/-2) x 10^-10 per Mpc^3 consistent with our previous estimates. The luminosity distribution of the sample is fit with a power law luminosity function Psi(L) ~ L^(-3.2+/-0.7), somewhat steeper than but consistent with our previous estimates., Comment: AJ in press (Aug 2004), 18 pages, 4 figures

Published
2004
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5. 'Convergent observations' with the stereoscopic HEGRA CT system

Author

Lampeitl, Hubert and Hofmann, Werner

Subjects
Astrophysics
Abstract

Observations of air showers with the stereoscopic HEGRA IACT system are usually carried out in a mode where all telescopes point in the same direction. Alternatively, one could take into account the finite distance to the shower maximum and orient the telescopes such that their optical axes intersect at the average height of the shower maximum. In this paper we show that this ``convergent observation mode'' is advantageous for the observation of extended sources and for surveys, based on a small data set taken with the HEGRA telescopes operated in this mode., Comment: 5 pages, 3 figures; Poster presented at the TeV Gamma Ray Workshop, Snowbird, 1999

Published
1999
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6. The Sixth Data Release of the Sloan Digital Sky Survey

Author

Adelman-McCarthy, Jennifer K., Agüeros, Marcel Andre, 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., Berlind, Andreas, 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 J., Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas P., 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., Ichikawa, Shin-Ichi, Ivezić, Željko, Jester, Sebastian, Johnson, Jennifer A., Jorgensen, Anders M., Jurić, 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., 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, 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, Uroš, 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, 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
Imaging systems in astronomy, Stars--Observations, Astronomy, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
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.

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

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel Andre, 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., 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 J., Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas P., 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, 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., Holtzman, Jon A., Ichikawa, Shin-Ichi, Ichikawa, Takashi, Ivezić, Željko, Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Jurić, Mario, Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Yu., Kron, Richard G., Krzesiński, 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., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, O'Mullane, 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, 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, Thaka, 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
Imaging systems in astronomy, Stars--Observations, Astronomy, Astrophysics
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.

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

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel Andre, 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., 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 J., Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas P., 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, Ivezić, Željko, Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Yu., Kron, Richard G., Krzesiński, 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., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, O'Mullane, 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, Uroš, Sergey, Gary, Sesar, Branimir, Sheldon, Erin, Shimasaku, Kazu, Siegmund, Walter A., Silvestri, Nicole M., Sirko, Edwin, 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, Thaka, 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
Imaging systems in astronomy, Stars--Observations, Astronomy, Astrophysics
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.

Published
2004
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