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J/AJ/141/88         Galaxy cluster environments of radio sources  (Wing+, 2011)
Galaxy cluster environments of radio sources.
    Wing J.D., Blanton E.L.
   <Astron. J., 141, 88 (2011)>
   =2011AJ....141...88W
ADC_Keywords: Clusters, galaxy ; Radio sources ; Photometry, SDSS

Keywords: galaxies: clusters: general - galaxies: groups: general -
          radio continuum: galaxies

Abstract:
    Using the Sloan Digital Sky Survey (SDSS) and the Faint Images of the
    Radio Sky at Twenty Centimeters (FIRST) catalogs, we examined the
    optical environments around double-lobed radio sources. Previous
    studies have shown that multi-component radio sources exhibiting some
    degree of bending between components are likely to be found in galaxy
    clusters. Often this radio emission is associated with a cD-type
    galaxy at the center of a cluster. We cross-correlated the SDSS and
    FIRST catalogs and measured the richness of the cluster environments
    surrounding both bent and straight multi-component radio sources. This
    led to the discovery and classification of a large number of galaxy
    clusters out to a redshift of z∼0.5.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table6.dat       108      384   All extended sources with N-191.0≥40


See also:
   VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
    II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
   http://www.sdss.rg : SDSS Home Page


Byte-by-byte Description of file: table6.dat

   Bytes Format Units   Label     Explanations

   1- 16  A16   ---     [WB2011]  Source name (JHHMMSS.s+DDMMSS)
      18  A1    ---     S         [VAS] Sample source belongs to (1)
  20- 21  I2    h       RAh       Hour of Right Ascension (J2000)
  23- 24  I2    min     RAm       Minute of Right Ascension (J2000)
  26- 30  F5.2  s       RAs       Second of Right Ascension (J2000)
      32  A1    ---     DE-       Sign of the Declination (J2000)
  33- 34  I2    deg     DEd       Degree of Declination (J2000)
  36- 37  I2    arcmin  DEm       Arcminute of Declination (J2000)
  39- 42  F4.1  arcsec  DEs       Arcsecond of Declination (J2000)
  44- 48  F5.2  mag     rmag0     Apparent SDSS dereddened r band magnitude
  50- 55  F6.2  mag     rMAG      Absolute SDSS r band magnitude
  57- 61  F5.1  mJy     S1440     Total 1440MHz flux density
  63- 67  F5.1  deg     theta     Radio source opening angle θ
  69- 76  A8    W/Hz    P1440     Total 1440MHz power
  78- 79  A2    ---     FR1       Ledlow & Owen (1996AJ....112....9L) FR type
  81- 83  A3    ---     FR2       FR type determined visually
  85- 89  F5.3  ---     z         Redshift
      91  A1    ---     f_z       [ab] Redshift type (a=spectro) (2)
  93- 95  I3    ---     N         Richness measurement N^-19^_1.0_ (3)
  97-100  F4.2  ---     fc        Schechter correction factor
 102-106  A5    ---     Abell     Abell source identification (4)
     108  A1    ---     f_Abell   [cd] Flag on Abell association (5)

Note (1): Sample source as follows:
    V = the visual bent sample
    A = the auto bent sample
    S = the straight sample
Note (2): Flag on z as follows:
    a = The redshift comes from a spectroscopic measurement
    b = The redshift comes from a photometric measurement
Note (3): The richness measurement, N-191.0 corresponds to counting all
     galaxies within a 1.0Mpc radius of the radio source with absolute
     magnitudes brighter than MV=-19.
Note (4): Located within 3Mpc (projected) of radio source.

Note (5): Flag on Abell as follows:
    c = The difference in redshift between the identified Abell cluster
        (from NED) and the radio cluster is greater than 1500km/s.
    d = The Abell cluster does not have a confirmed redshift in NED.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    28-Jul-2012