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J/MNRAS/339/913     Two distant massive clusters of galaxies       (Edge+, 2003)
The discovery of two distant, massive clusters of galaxies in the
ROSAT All-Sky Survey.
    Edge A.C., Ebeling H., Bremer M., Rottgering H., Van Haarlem M.P.,
    Rengelink R., Courtney N.J.D.
   <Mon. Not. R. Astron. Soc. 339, 913 (2003)>
   =2003MNRAS.339..913E
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Radio sources

Keywords: galaxies: clusters: individual: MACS J0717.5 +3745 -
          galaxies: clusters: individual: MACS J1621.3 +3810 -
          cooling flows - radio continuum: galaxies

Abstract:
    We discuss the radio, optical, and X-ray properties of two newly
    discovered, very X-ray luminous, distant clusters of galaxies. Both
    systems were noted as cluster candidates in a cross-correlation of
    data from the WENSS (VIII/162) radio survey and the ROSAT All-Sky
    Survey (IX/10). Follow-up observations performed by us and the
    Massive Cluster Survey (MACS) team confirmed both sources as distant
    galaxy clusters. The first cluster, MACS J0717.5+3745 at a redshift of
    z=0.5548, contains a very extended, steep-spectrum radio source offset
    from the cluster core, making it the most distant radio relic known.
    The second cluster, MACS J1621.3+3810 at z=0.465, is a strong cooling
    flow with a relatively weak central radio source. We present results
    from ROSAT High-Resolution Imager (HRI, Cat. IX/28) observations of
    both clusters as well as from optical imaging and VLA radio
    interferometry observations. Our discoveries demonstrate that distant
    clusters can be efficiently identified in a relatively shallow X-ray
    survey, that radio/X-ray selection is efficient, and that both cooling
    flow and non-cooling flow clusters are selected.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       107      112   Identifications of cluster candidates and
                              known clusters with z>0.3.
refs.dat          72       17   References


See also:
      IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
      IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)
      I/221 : The Magellanic Catalogue of Stars - MACS (Tucholke+ 1996)
    VIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998)


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

   Bytes Format Units   Label     Explanations

   1- 16  A16   ---     RASS-BSC  RASS-BSC designation (JHHMMSS.s+DDMMSS)
      17  A1    ---   n_RASS-BSC  [*] Note (1)
  19- 33  A15   ---     WENSS     WENSS designation (WNBHHMM.m+DDMM)
  34- 37  F4.1  arcsec  OffSet    Offset between RASS-BSC and WENSS objects
  39- 43  I5    mJy     Flux      WENSS Integrated flux density at 330MHz
  45- 49  F5.2  ---     Sp-Index  Spectral index (alpha1.4GHz365MHz)
      51  A1    ---     P1.4GHz   [YN] Polarized flag, Pol1.4GHz>2%
      53  A1    ---     Obs?      [YN-] Observed ?
  55-104  A50   ---     Note      Comments, identifications and redshifts (2)
 106-107  I2    ---     Ref       ? Reference for redshift specified in Com,
                                    in refs.dat file (3)

Note (1): Sources marked with an asterisk do not meet the final selection
          criteria but were imaged to provide a control sample.
Note (2): MACS JHHMM.m+DDMM identified as MCS JHHMMm+DDMM in Simbad

Note (3): References are given to all redshifts published in the last decade.



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

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Ref       Reference code
   4- 22  A19   ---     BibCode   BibCode
  24- 48  A25   ---     Aut       Author's name
  50- 72  A23   ---     Com       Comments


History:
    From electronic version of the journal
(End)                                        Patricia Bauer [CDS]    27-May-2003