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J/ApJS/158/161      Photometric redshift catalog from the RCS     (Hsieh+, 2005)
A photometric redshift galaxy catalog from the Red-Sequence Cluster Survey.
    Hsieh B.C., Yee H.K.C., Lin H., Gladders M.D.
   <Astrophys. J. Suppl. Ser., 158, 161-177 (2005)>
   =2005ApJS..158..161H
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Redshifts

Keywords: catalogs - galaxies: distances and redshifts - galaxies: general -
          galaxies: photometry - surveys - techniques: photometric

Abstract:
    The Red-Sequence Cluster Survey (RCS, Cat. J/ApJS/157/1) provides a
    large and deep photometric catalog of galaxies in the z' and Rc
    bands for 90°2 of sky, and supplemental V and B data have been
    obtained for 33.6°2. We compile a photometric redshift catalog
    from these four-band data by utilizing the empirical quadratic
    polynomial photometric redshift fitting technique in combination with
    CNOC2 and GOODS/HDF-N redshift data. The training set includes 4924
    spectral redshifts. The resulting catalog contains more than one
    million galaxies with photometric redshifts <1.5 and Rc<24, giving
    an rms scatter σ(Δz)<0.06 within the redshift range
    0.2<z<0.5 and σ(Δz)<0.11 for galaxies at 0.0<z<1.5.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        53       10   CFHT RCS patches
table3.dat       134  1464939   Photometric redshift catalog for extended sources


See also:
  J/ApJS/157/1   : Red-Sequence Cluster Survey (Gladders+, 2005)
  J/ApJS/129/475 : The CNOC2 survey. I. (Yee+, 2000)
  II/261         : GOODS initial results (Giavalisco+, 2005)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Seq       Patch number
   4- 10  A7    ---     Name      Patch name
  12- 13  I2    h       RAh       Hour of right ascension (J2000)
  15- 16  I2    min     RAm       Minute of right ascension (J2000)
  18- 21  F4.1  s       RAs       Second of right ascension (J2000)
      23  A1    ---     DE-       Sign of the declination (J2000)
  24- 25  I2    deg     DEd       Degree of declination (J2000)
  27- 28  I2    arcmin  DEm       Arcminute of declination (J2000)
  30- 31  I2    arcsec  DEs       Arcsecond of declination (J2000)
  33- 36  F4.2  deg2    Area1     Area with Rc and z'
  38- 41  F4.2  deg2    Area2     Area with four filters
  43- 53  A11   ---     Note      Note


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 11  I11   ---     RCS       Object RCS identification number (1)
  15- 23  F9.6  h       RAhour    Hour of Right Ascension (J2000)
  25- 34  F10.5 deg     DEdeg     Declination in decimal degrees (J2000)
  37- 41  F5.2  mag     z'mag     Total z' band magnitude (2)
  45- 48  F4.2  mag     e_z'mag   ?=9.99 Error in z'mag (3)
  52- 55  F4.2  mag     e-z'mag   ?=9.00 Color aperture error in z'mag (4)
  58- 62  F5.2  mag     Rcmag     Total R_c_ band magnitude (2)
  66- 69  F4.2  mag     e_Rcmag   ?=9.99 Error in Rcmag (3)
  73- 76  F4.2  mag     e-Rcmag   ?=9.00 Color aperture error in Rcmag (4)
  79- 83  F5.2  mag     Vmag      ?=99.00 Total V band magnitude (2)
  87- 90  F4.2  mag     e_Vmag    ?=9.99 Error in Vmag (3)
  94- 97  F4.2  mag     e-Vmag    ?=9.00 Color aperture error in Vmag (4)
 100-104  F5.2  mag     Bmag      ?=99.00 Total B band magnitude (2)
 108-111  F4.2  mag     e_Bmag    ?=9.99 Error in Bmag (3)
 115-118  F4.2  mag     e-Bmag    ?=9.00 Color aperture error in Bmag (4)
 121-126  F6.3  ---     z         ?=99.000 Photometric redshift (5)
 129-134  F6.3  ---     e_z       ?=99.000 Computed error in z (5)

Note (1): The first two digits indicate the patch number, numbered 01 to 10
          in the order of the patches in Table 1.  The second two digits
          indicate the pointing number within a patch.  The third two digits
          indicate the CCD chip number within the pointing.  The remaining
          five digits represent the object number within each CCD chip.
Note (2): Values of >90.00 in the total magnitude, 9.99 in the error,
          and 9.00 in the color aperture error indicate unknown values for
          that filter.
Note (3): Derived from the photon noise in the optimal aperture (on total
          magnitude, see Yee 1991PASP..103..396Y, Gladders & Yee 2005, Cat.
          J/ApJS/157/1) for each object.
Note (4): The sum in quadrature of the photon errors for each filter in
          the color aperture.
Note (5): 99.000=Unknown.



History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    02-Nov-2005