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J/AJ/121/2308     Sloan Digital Sky Survey quasar photometry   (Richards+, 2001)
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Colors of 2625 quasars at 0<z<5 measured in the
 Sloan Digital Sky Survey photometric system.
    Richards G.T., Fan X., Schneider D.P., Vanden Berk D.E., Strauss M.A.,
    York D.G., Anderson J.E.Jr, Anderson S.F., Annis J., Bahcall N.A.,
    Bernardi M., Briggs J.W., Brinkmann J., Brunner R., Burles S., Carey L.,
    Castander F.J., Connolly A.J., Crocker J.H., Csabai I., Doi M.,
    Finkbeiner D., Friedman S.D., Frieman J.A., Fukugita M., Gunn J.E.,
    Hindsley R.B., Ivezic Z., Kent S., Knapp G.R., Lamb D.Q., Leger R.F.,
    Long D.C., Loveday J., Lupton R.H., McKay T.A., Meiksin A., Merrelli A.,
    Munn J.A., Newberg H.J., Newcomb M., Nichol R.C., Owen R., Pier J.R.,
    Pope A., Richmond M.W., Rockosi C.M., Schlegel D.J., Siegmund W.A., Smee S.,
    Snir Y., Stoughton C., Stubbs C., Subbarao M., Szalay A.S., Szokoly G.P.,
    Tremonti C., Uomoto A., Waddell P., Yanny B., Zheng W.
   <Astron. J. 121, 2308 (2001)>
   =2001AJ....121.2308R
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ADC_Keywords: QSOs ; Surveys ; Photometry
Keywords: catalogs - quasars: general - survey

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 2.5{deg} wide
    stripe centered on the celestial equator covering ~529deg^2^.
    Positions (accurate to 0.2") and SDSS magnitudes are given for the 898
    quasars known prior to SDSS spectroscopic commissioning.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table2.dat    135      898   SDSS (Sloan Digital Sky Survey) quasar photometry
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See also:
  J/AJ/115/296  : SDSS new variables (Henden+ 1998)
  J/AJ/119/2598 : u'g'r'i'z' photometry of LCRS galaxies (Sowards-Emmerd+, 2000)
  J/AJ/121/2331 : Coma cluster SDSS spectrosc. commissioning (Castander+, 2001)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label   Explanations
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   1- 30  A30   ---     Name    Quasar name
  32- 36  F5.3  ---     z       Redshift
  38- 39  I2    h       RAh     Right Ascension (J2000)
  41- 42  I2    min     RAm     Right Ascension (J2000)
  44- 48  F5.2  s       RAs     Right Ascension (J2000)
      50  A1    ---     DE-     Sign of the Declination (J2000)
  51- 52  I2    deg     DEd     Declination (J2000)
  54- 55  I2    arcmin  DEm     Declination (J2000)
  57- 60  F4.1  arcsec  DEs     Declination (J2000)
  62- 65  F4.2  arcsec  DelPos  Difference between SDSS and cataloged positions
  67- 71  F5.2  mag     u*mag   The SDSS u^*^ band photometry (1)
  73- 77  F5.3  mag   e_u*mag   Uncertainty in umag
  79- 83  F5.2  mag     g*mag   The SDSS g^*^ band photometry (1)
  85- 89  F5.3  mag   e_g*mag   Uncertainty in gmag
  91- 95  F5.2  mag     r*mag   The SDSS r^*^ band photometry (1)
  97-101  F5.3  mag   e_r*mag   Uncertainty in rmag
 103-107  F5.2  mag     i*mag   The SDSS i^*^ band photometry (1)
 109-113  F5.3  mag   e_i*mag   Uncertainty in imag
 115-119  F5.2  mag     z*mag   The SDSS z^*^ band photometry (1)
 121-125  F5.3  mag   e_z*mag   Uncertainty in zmag
 127-130  F4.2  mag     RedVec  Reddening vector in E(g^*^ - r^*^)  (2)
 132-134  A3    ---   r_Name    Source catalog of each object (3)
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Note (1): SDSS magnitudes are based on the AB magnitude system Oke & Gunn
     (1983ApJ...266..713O), and are given as asinh magnitudes
     Lupton, Gunn, & Szalay (1999AJ....118.1406L).
Note (2): As determined from Schlegel et al. (1998ApJ...500..525S).
Note (3): Source catalog of each object:
      1 = NED;
      2 = SDSS.
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History:
    From electronic version of the journal
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(End)                   Greg Schwarz [AAS],  Patricia Bauer [CDS]    30-Aug-2001