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J/ApJS/183/197     Galaxy clusters identified from the SDSS-DR6     (Wen+, 2009)
Galaxy clusters identified from the SDSS DR6 and their properties.
    Wen Z.L., Han J.L., Liu F.S.
   <Astrophys. J. Suppl. Ser., 183, 197-213 (2009)>
   =2009ApJS..183..197W
ADC_Keywords: Redshifts ; Clusters, galaxy ; Cross identifications

Keywords: galaxies: clusters: general - galaxies: distances and redshifts


Abstract:
    Clusters of galaxies in most of the previous catalogs have redshifts
    z≤0.3. Using the photometric redshifts of galaxies from the Sloan
    Digital Sky Survey Data Release 6 (SDSS DR6), we identify 39716
    clusters in the redshift range 0.05<z<0.6 with more than eight
    luminous (Mr≤-21) member galaxies. Cluster redshifts are estimated
    accurately with an uncertainty of less than 0.022. The contamination
    rate of member galaxies is found to be roughly 20%, and the
    completeness of member galaxy detection reaches ∼90%. Monte Carlo
    simulations show that the cluster detection rate is more than 90% for
    massive (M200>2x1014M☉) clusters of z≤0.42. The false
    detection rate is ∼5%. We obtain the richness, the summed luminosity,
    and the gross galaxy number within the determined radius for
    identified clusters. They are tightly related to the X-ray luminosity
    and temperature of clusters. Cluster mass is related to the richness
    and summed luminosity with M200∝R1.90±0.04 and
    M200∝L1.64±0.03r, respectively. In addition, 790 new
    candidates of X-ray clusters are found by cross-identification of our
    clusters with the source list of the ROSAT X-ray survey.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       132    39668   Clusters identified from the SDSS-DR6 (table
                             from erratum 2010ApJS..187..272W)
table2.dat        87      912   Clusters with ROSAT X-ray sources including
                             685 candidates and 227 known X-ray clusters
                             (table from erratum 2010ApJS..187..272W)


See also:
    II/282  : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
    VII/190 : Zwicky Galaxy Catalog (Zwicky+ 1968)
    VII/4   : Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
    VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
    IX/29   : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
    II/294  : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
  J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000)
  J/AJ/123/1807  : SDSS galaxy clusters redshifts (Goto+, 2002)
  J/AJ/125/2064  : Northern Optical Cluster Survey. II. (Gal+, 2003)
  J/AJ/128/1017  : Northern Optical Cluster Survey. IV. (Lopes+, 2005)
  J/A+A/425/367  : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
  J/ApJ/660/239  : SDSS MaxBCG catalog of 13823 galaxy clusters (Koester+, 2007)
  http://www.sdss.org : SDSS Home page


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

   Bytes Format Units   Label     Explanations

   1-  3  A3    ---     ---       [WHL]
   5- 20  A16   ---     WHL       Cluster name (JHHMMSS.s+DDMMSS) (1)
  22- 30  F9.5  deg     RAdeg     BCG Right Ascension in decimal degrees (J2000)
  32- 40  F9.5  deg     DEdeg     BCG Declination in decimal degrees (J2000)
  42- 47  F6.4  ---     zph       Photometric redshift of cluster
  49- 55  F7.4  ---     zsp       BCG spectroscopic redshift of cluster
  57- 61  F5.2  mag     rmag      BCG r band magnitude
  63- 65  I3    ---     Ngal      Number of member galaxy candidates within 1Mpc
  67- 72  F6.2  ---     R         Cluster richness
  74- 79  F6.2  ---     GCN       Gross galaxy number
  81- 86  F6.2  Mpc     Rad       Radius of member galaxy detection
  88- 93  F6.2 10+10Lsun Lr       Summed r band cluster luminosity
  95-100  F6.2  ---     D         Overdensity level of cluster
 103-132  A30   ---     Cats      Other catalogs containing the cluster (2)

Note (1): [WHL2009] JHHMMSS.s+DDMMSS or [WHL2009] JHHMMSS.s+DDMMSS BCG
          for the BCGs in Simbad.
Note (2): Acronyms used:
  Abell = Abell 1958, Cat. VII/4, Abell et al. 1989, Cat. VII/110,
          ACO NNNN in Simbad;
  Zwcl  = Zwicky et al., 1968, Cat. VII/190, ZwCl HHMM+DDMM or ZwCl FFF-NNN
          in Simbad;
  CE    = Goto et al. 2002, Cat. J/AJ/123/1807;
  NSC   = Gal et al. 2003, Cat. J/AJ/125/2064, NSC JHHMMSS+DDMMSS in Simbad;
  NSCS  = Lopes et al. 2004, Cat. J/AJ/128/1017, NSCS Jhhmmss+ddmmss in Simbad
 maxBCG = Koester et al. 2007, Cat. J/ApJ/660/239, cluster identified
          as [KMA2007] DDD.ddddd+DD.ddddd in Simbad;
  RXC   = Bohringer et al. 2000, Cat. J/ApJS/129/435,
          2004, Cat. J/A+A/425/367, RXC JHHMM.m+DDMM in Simbad.


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

   Bytes Format Units   Label     Explanations

   1-  3  A3    ---     ---       [1RXS]
   5- 20  A16   ---     1RXS      Name of X-ray source (JHHMMSS.s+DDMMSS)
  22- 24  A3    ---     ---       [WHL]
  26- 41  A16   ---     WHL       Cluster name (JHHMMSS.s+DDMMSS)
  43- 51  F9.5  deg     RAdeg     BCG Right Ascension in decimal degrees (J2000)
  53- 61  F9.5  deg     DEdeg     BCG Declination in decimal degrees (J2000)
  63- 68  F6.4  ---     zph       Photometric redshift of cluster
  70- 75  F6.2  Mpc     rp        Projected X-ray source and cluster BCG
                                  separation
  77- 82  F6.3  ct/s    Xrate     X-ray cluster 0.1-2.4keV band count rate
  84- 87  A4    ---     NED       Known X-ray cluster in NED


History:
   * 29-Jan-2010: From electronic version of the journal
   * 27-May-2010: Corrected tables from erratum 2010ApJS..187..272W
(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    12-Jan-2010