ACDS V10.0 - Detailed Description of J/ApJ/502/558

ACDS V10.0 - Sun Jan 19 22:38:17 CET 2025

| # Detailed Description of J/ApJ/502/558 : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    J/ApJ/502/558       Catalog of ROSAT galaxy clusters          (Vikhlinin+ 1998)
    ================================================================================
    A catalog of 200 galaxy clusters serendipitously detected in the
    ROSAT PSPC pointed observations.
          Vikhlinin A., McNamara B.R., Forman W., Jones C., Quintana H.,
          Hornstrup A.
         <Astrophys. J. 502, 558 (1998)>
         =1998ApJ...502..558V
    ================================================================================
    ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts

    Mission_Name: ROSAT

    Keywords: catalogs - galaxies: clusters: general - surveys - X-rays: galaxies

    Abstract:
        We present a catalog of 203 clusters of galaxies serendipitously
        detected in 647 ROSAT PSPC high Galactic latitude pointings covering
        158deg2. This is one of the largest X-ray-selected cluster samples,
        comparable in size only to the ROSAT All-Sky Survey sample of nearby
        clusters (Ebeling et al., 1997ApJ...479L.101E). We detect clusters in
        the inner 175 of the ROSAT PSPC field of view using the spatial extent
        of their X-ray emission. Fluxes of detected clusters range from
        1.6x10-14 to 8x10-12ergs/s/cm2 in the 0.52keV energy band. X-ray
        luminosities range from 1042ergs/s, corresponding to very poor
        groups, to ~5x1044ergs/s, corresponding to rich clusters. The
        cluster redshifts range from z=0.015 to z>0.5. The catalog lists X-ray
        fluxes, core radii, and spectroscopic redshifts for 73 clusters and
        photometric redshifts for the remainder.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table3.dat        67      223   Cluster catalog
    × notes.dat         79       41   Notes to table3.dat

    See also:
       IX/11 : ROSAT Source Catalog        (Voges+ 1994)

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

       Bytes Format Units    Label   Explanations

       1-  3  I3    ---     [VMF98]  Sequential number
       5-  6  I2    h        RAh     X-ray centroid right ascension (J2000)
       8-  9  I2    min      RAm     X-ray centroid right ascension (J2000)
      11- 14  F4.1  s        RAs     X-ray centroid right ascension (J2000)
          16  A1    ---      DE-     X-ray centroid declination sign (J2000)
      17- 18  I2    deg      DEd     X-ray centroid declination (J2000)
      20- 21  I2    arcmin   DEm     X-ray centroid declination (J2000)
      23- 24  I2    arcsec   DEs     X-ray centroid declination (J2000)
      26- 30  F5.1 10-17W/m2 FX      Total unabsorbed X-ray flux in the 0.5-2keV
                                       energy band (in 10-14erg/s/cm2)
      32- 35  F4.1 10-17W/m2 e_FX    rms uncertainty on FX
      37- 39  I3    arcsec   Rc      Angular core radius
      41- 42  I2    arcsec   e_Rc    rms uncertainty on Rc
      44- 48  F5.3  ---      z       ? Heliocentric spectroscopic or photometric
                                        redshift (1)
      50- 53  F4.2  ---      zmin    ? Photometric redshift 90% confidence interval
          54  A1    ---      ---     [-]
      55- 58  F4.2  ---      zmax    ? Photometric redshift 90% confidence interval
      59- 61  A3    ---      n_zmax  [dss ] dss: Digited Sky Survey redshift
      63- 64  I2    arcsec   errPos  90% X-ray position error circle
          65  A1    ---     detFlag  [UF] Uncertain or False detections (2)
      66- 67  I2    ---      Note    ? Note detailed in file "notes.dat"

    Note (1): If the redshift is spectroscopic, no error interval is given

    Note (2): the 'U' flag is set for clusters
        that show clear concentrations of galaxies near the X-ray position,
        but the choice of BCG is uncertain because of the large cluster
        angular size. No photometric redshift are given.

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

       Bytes Format Units   Label     Explanations

       1-  2  I2    ---     Note      Note number
       4- 79  A76   ---     Text      Text of the note

    History: From ApJ electronic version
      * 18-Dec-2001: Thanks to checks by Stephen A. Drake
        (drake@olegacy.gsfc.nasa.gov), the flux units have corrected.
    ================================================================================
    (End)                           James Marcout, Patricia Bauer [CDS]  22-Sep-1998