Access to Astronomical Catalogues

J/AJ/133/1780       GALEX/SDSS quasar catalog                (Trammell+, 2007)
The UV properties of SDSS-selected quasars.
    Trammell G.B., Vanden Berk D.E., Schneider D.P., Richards G.T., Hall P.B.,
    Anderson S.F., Brinkmann J.
   <Astron. J., 133, 1780-1794 (2007)>
   =2007AJ....133.1780T
ADC_Keywords: Surveys ; QSOs ; Ultraviolet ; Photometry, SDSS

Keywords: catalogs - surveys - galaxies: active - quasars: general -
          ultraviolet: galaxies

Abstract:
    We present an analysis of the broadband UV and optical properties of
    z~<3.4 quasars matched in the Galaxy Evolution Explorer (GALEX)
    General Data Release 1 (GR1) and the Sloan Digital Sky Survey (SDSS)
    Data Release 3 (DR3). Of the 6371 SDSS DR3 quasars covered by 204
    GALEX GR1 tiles, 5380 (84%) have near-UV detections, while 3034 (48%)
    have both near-UV and far-UV detections using a matching radius of 7".
    Most of the DR3 sample quasars are detected in the near-UV until
    z∼1.7, with the near-UV detection fraction dropping to ∼50% by z∼2.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       303     6371   GALEX GR1 matches to SDSS DR3 Quasars
table5.dat        24       63   Table for median SED


See also:
       II/259   : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005)
 J/AJ/130/825   : GALEX ultraviolet variability catalog (Welsh+, 2005)
 J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
 http://galex.stsci.edu/GR1  : GALEX GR1 Home Page
 http://www.sdss.org : SDSS Home Page


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label    Explanations

   1- 18  A18   ---     SDSS     SDSS DR3 Quasar Catalog object designation (1)
  20- 38  A19   ---     GALEX    ? GALEX GR1 merged object catalog
                                   designation (2)
  40- 49  F10.6 deg     RAdeg    SDSS Right Ascension
                                  in decimal degrees (J2000.0)
  51- 60  F10.6 deg     DEdeg    SDSS Declination in decimal degrees (J2000.0)
  62- 72  F11.6 deg     RAGdeg   ?=-999.000000 GALEX Right Ascension (J2000)
  74- 84  F11.6 deg     DEGdeg   ?=-999.000000 GALEX Declination (J2000)
  86- 92  F7.2  arcsec  Off      ?=-999.00 GALEX/SDSS coordinate position
                                           offset (3)
  94- 99  F6.4  ---     z        SDSS derived redshift
 101-106  F6.3  mag     umag     SDSS PSF u band magnitude (4)
 108-112  F5.3  mag     e_umag   Error in umag
 114-119  F6.3  mag     gmag     SDSS PSF g band magnitude (4)
 121-125  F5.3  mag     e_gmag   Error in gmag
 127-132  F6.3  mag     rmag     SDSS PSF r band magnitude (4)
 134-138  F5.3  mag     e_rmag   Error in rmag
 140-145  F6.3  mag     imag     SDSS PSF i band magnitude (4)
 147-151  F5.3  mag     e_imag   Error in imag
 153-158  F6.3  mag     zmag     SDSS PSF z band magnitude (4)
 160-164  F5.3  mag     e_zmag   Error in zmag
 166-173  F8.3  mag     fmag     ?=-999. GALEX f (FUV=120-177nm) magnitude (5)
 175-182  F8.3  mag     e_fmag   ?=-999. Error in GR1 object catalog fmag
 184-191  F8.3  mag     efmag    ?=-999. Empirical calibration error in fmag
 193-200  F8.3  mag     nmag     ?=-999. GALEX n (NUV=177-300nm) magnitude (5)
 202-209  F8.3  mag     e_nmag   ?=-999. Error in GR1 object catalog nmag
 211-218  F8.3  mag     enmag    ?=-999. Empirical calibration error in nmag
 220-224  F5.3  mag     Au       Galactic absorption in the SDSS u band (6)
 226-231  F6.3  [cm-2]  logNH    Logarithmic Galactic HI column density
 233-239  F7.3  mag     iMAG     Absolute SDSS i band magnitude (7)
 241-248  F8.3  [10-7W] L2200    ?=-999.000 Log of monochromatic luminosity
                                            at 2200Å (8)
 250-257  F8.3  [10-7W] L5100    ?=-999.000 Log of monochromatic luminosity
                                            at 5100Å (8)
 259-264  F6.3  mag     d(g-i)   Relative (g-i) color index (9)
 266-273  F8.3  mag     d(f-n)   ?=-999.000 Relative (f-n) color index (10)
 275-281  F7.5  deg     Dist     Object distance from GALEX field center
 283-291  E9.3  s       Nexp     GALEX NUV effective exposure time (11)
 293-301  E9.3  s       Fexp     GALEX FUV effective exposure time (11)
     303  I1    ---     S        GALEX survey identifier (12)

Note (1): In hhmmss.ss+ddmmss.s (J2000.0) format.

Note (2): A blank indicates no detection.

Note (3): A -999 entry if there is no match within 7".

Note (4): Not corrected for Galactic extinction and given in AB-magnitudes.
          From BEST processing if available.
Note (5): Not corrected for Galactic absorption and given in AB-magnitudes.
          A -999 entry indicates no detection.
Note (6): Where Af, An, Ag, Ar, Ai, Az = 1.584, 1.692, 0.736, 0.534, 0.405,
          0.287xAu.
Note (7): Where H0=70km/s/Mpc, OmegaM=0.30, OmegaL=0.70, and
          alphaQ=-0.50).
Note (8): Rest-frame and in units of erg/s. A -999 entry indicates no value.

Note (9): Corrected for Galactic absorption using the absorption maps
          of Schlegel et al. (1998ApJ...500..525S).
Note (10): A -999 entry unless there is a detection in both f,n bands.

Note (11): If there is no detection in either or both band(s), nexp, fexp,
           and Survey are drawn from the deepest (highest texp) tile
           that covered the quasar.
Note (12): GALEX survey identifier as follows:
       4 = AIS, All-Sky Imaging Survey
       3 = NGS, Nearby Galaxy Survey
       2 = MIS, Medium Imaging Survey
       1 = DIS, Deep Imaging Survey


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label   Explanations

   1-  5  F5.3  [0.1nm] logW    Logarithmic rest frame wavelength in Angstroms
   7- 12  F6.3  [Hz]    logf    Logarithmic rest frame frequency
  14- 18  F5.3  ---     RFlux   Flux relative to 2200 Angstroms flux
  20- 24  F5.3  ---    e_RFlux  The rms uncertainty in RFlux


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    03-May-2009