Detailed Description of J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)

J/MNRAS/301/881     The ROSAT brightest cluster sample - I.  (Ebeling+, 1998)
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The ROSAT brightest cluster sample - I.
The compilation of the sample and the cluster log N-log S distribution.
    Ebeling H., Edge A.C., Boehringer H., Allen S.W., Crawford C.S.,
    Fabian A.C., Voges W., Huchra J.P.
   <Mon. Not. R. Astron. Soc. 301, 881 (1998)>
   =1998MNRAS.301..881E
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ADC_Keywords: Clusters, galaxy ; X-ray sources ; Surveys

Mission_Name: ROSAT

Keywords: catalogues - surveys - galaxies: clusters: general -
          cosmology: observations - large-scale structure of Universe -
          X-rays: galaxies

Abstract:
    We present a 90 per cent flux-complete sample of the 201
    X-ray-brightest clusters of galaxies in the northern hemisphere
    ({delta}>=0°), at high Galactic latitudes (|b|>= 20°), with
    measured redshifts z<=0.3 and fluxes higher than
    4.4x10-12erg/cm2/s in the 0.112.4 keV band. The sample, called the
    ROSAT Brightest Cluster Sample (BCS), is selected from ROSAT All-Sky
    Survey data and is the largest X-ray-selected cluster sample compiled
    to date. In addition to Abell clusters, which form the bulk of the
    sample, the BCS also contains the X-ray-brightest Zwicky clusters and
    other clusters selected from their X-ray properties alone. Effort has
    been made to ensure the highest possible completeness of the sample
    and the smallest possible contamination by non-cluster X-ray sources.
    X-ray fluxes are computed using an algorithm tailored for the
    detection and characterization of X-ray emission from galaxy clusters.
    These fluxes are accurate to better than 15 per cent (mean 1{sigma}
    error).

File Summary:

       FileName      Lrecl  Records   Explanations

×                   80        .   This file
× ReadMe            80        .   This file
× table3.dat       119      206   The ROSAT Brightest Cluster Sample
× refs.dat          73       47   References


See also:
           IX/10   : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
   J/ApJ/502/558   : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)
   J/ApJ/514/148   : ROSAT survey of bright galaxies clusters (De Grandi+, 1999)
   J/MNRAS/306/857 : ROSAT Brightest Cluster Sample. III. (Crawford+, 1999)
   J/MNRAS/318/333 : Extended ROSAT Bright Cluster Sample (Ebeling+ 2000)


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

   Bytes Format Units     Label   Explanations

   1-  4  A4    ---       n_Name  Note on Name (1)
   6- 20  A15   ---       Name    Cluster name (2)
  22- 23  I2    h         RAh     Right ascension (B1950)
  25- 26  I2    min       RAm     Right ascension (B1950)
  28- 31  F4.1  s         RAs     Right ascension (B1950)
      33  A1    ---       DE-     Declination sign (B1950)
  34- 35  I2    deg       DEd     Declination (B1950)
  37- 38  I2    arcmin    DEm     Declination (B1950)
  40- 41  I2    arcsec    DEs     Declination (B1950)
  43- 49  F7.3  deg       RAdeg   X-ray right ascension (J2000)
  51- 57  F7.3  deg       DEdeg   X-ray declination (J2000)
  59- 62  F4.1  10+20cm-2 NH      Hydrogen column density from
                                  Stark et al. (1992, Cat. J/ApJS/79/77)
  64- 67  I4    s         Texp    RASS exposition time
  69- 73  F5.2  ct/s     CR(VTP)  PSPC count rate in PHA (Pulse Height Analyser)
                                  channels 11 to 235 originally detected by VTP
                                  (Voronoi tesselation and percolation)
  75- 78  F4.1  arcmin    R(VTP)  Equivalent radius of the source detected by
                                  VTP (Voronoi tesselation and percolation)
  80- 85  F6.2  ct/s      CR      Final PSCP count rate (3)
  87- 91  F5.2  ct/s      e_CR    rms uncertainty on CR (4)
  93- 96  F4.1  keV       kT      Intra-cluster medium gas temperature used in
                                  conversion from count rates to energy fluxes
      97  A1    ---       n_kT    [e] e: temperature estimated
  99-103  F5.4  ---       z       Redshift
 105-109  F5.1  10-15W/m2 FX      Unabsorbed X-ray energy flux in the
                                  0.1-2.4keV band (10-12erg/cm2/s)
 111-116  F6.2  10+37W    LX      Intrinsic X-ray luminosity in 0.1-2.4keV band
 118-119  I2    ---       r_z     Redshift reference in refs.dat file

Note (1): Flags:
     V = extended according to VTP, Voronoi tesselation and percolation
     S = extended according to SASS, Standard Analysis Sofware System
         (Vosges et al., 1992, Proc. Satellite Symp. 3, ESA ISY-3, p. 223)
     c = likely contamination from point sources
     + = serendipitous VTP detection
     * = redshift z>0.3
Note (2): Where clusters appear to consist of two components,
     two entries ('a' and 'b') are listed.
Note (3): Final PSC count rate in PHA channels 11 to 235 based on the original
     VTP count rate. Statistical corrections for low-surface brightness
     emission that has not been detected directly and for contamination
     from point sources have been applied.
Note (4): Error in the final PSPC count rate according to equation
          {Delta}CR/CR=2.29(CR*Texp)-0.48.
     The fractional uncertainty in the energy flux and the X-ray luminosity 
     can be assumed to be the same as the fractional count rate error.


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

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Ref       Reference number
   4- 22  A19   ---     BibCode   BibCode
  24- 49  A26   ---     Aut       Author's name
  51- 73  A23   ---     Com       Comments


History:
    Provided by H. Andernach, A489 in his list
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(End)                                   Francois Ochsenbein [CDS]    28-Jun-2000