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J/MNRAS/337/256     Galaxy in low X-ray luminosity clusters    (Balogh+, 2002)
Galaxy properties in low X-ray luminosity clusters at z=0.25.
    Balogh M., Bower R.G., Smail I., Ziegler B.L., Davies R.L., Gaztelu A.,
    Fritz A.
   <Mon. Not. R. Astron. Soc. 337, 256 (2002)>
   =2002MNRAS.337..256B
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Velocity dispersion ;
              Equivalent widths
Keywords: Galaxies: clusters: general


Abstract:
    We present the first spectroscopic survey of intrinsically low X-ray
    luminosity clusters at z\gl0, with Hubble Space Telescope (HST) WFPC2
    imaging and spectroscopy from Calar Alto and WHT-LDSS2. We study 172
    confirmed cluster members in a sample of ten clusters at 0.23<z<0.3,
    with LX≲4x1043h-2erg/s[0.1-2.4keV]. The core of each cluster is
    imaged with WFPC2 in the F702W filter, and the spectroscopic sample is
    statistically complete to Mr~-19.0+5logh, within an 11' (∼1.8h-1Mpc)
    field. The clusters are dynamically well-separated from the
    surrounding field and most have velocity distributions consistent with
    Gaussians. The velocity dispersions range from 350-850km/s, consistent
    with the local LX-σ correlation. All 10 clusters host a
    bright, giant elliptical galaxy without emission lines, near the
    centre of the X-ray emission. We measure the equivalent width of two
    nebular emission lines, [O II] and Hα, and the Hδ
    absorption line to classify the cluster members spectrally. Galaxy
    morphologies are measured from the HST images, using the
    two-dimensional surface-brightness fitting software GIM2D.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        61       10   Properties of the 10 clusters
table4.dat       100      173   Properties of cluster members


See also:
   J/ApJS/56/403  : X-ray survey of clusters of galaxies. IV. (Kowalski+, 1984)
   J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000)


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

   Bytes Format Units   Label     Explanations

   1-  2  A2    ---     ---       [Cl]
   4- 10  A7    ---     Cluster   Cluster name (HHMM+DD)
      11  A1    ---    m_Cluster  [ab] Multiplicity index on Cluster
  13- 14  I2    h       RAh       Right ascension (J2000)
  16- 17  I2    min     RAm       Right ascension (J2000)
  19- 20  I2    s       RAs       Right ascension (J2000)
      22  A1    ---     DE-       Declination sign (J2000)
  23- 24  I2    deg     DEd       Declination (J2000)
  26- 27  I2    arcmin  DEm       Declination (J2000)
  29- 30  I2    arcsec  DEs       Declination (J2000)
  33- 34  I2    ---     Nmemb     Number of members
  36- 41  F6.4  ---     <z>       Mean redshift
  43- 45  I3    km/s    sigma     Velocity dispersion
  47- 50  I4    km/s    e_sigma   rms uncertainty on sigma
  52- 55  F4.2  10+36W  LX        X-ray luminosity in 1043h-2erg/s
      56  A1    ---     n_LX      [b] Note for Cl 1444+63 (1)
  58- 61  F4.2  ---     Comp      Completeness  (2)

Note (1): Cl 1444+63 is only detected as a single X-ray source;
     this LX presumably includes contribution from both clusters.
Note (2): Computed for galaxies more than 1 magnitude brighter than
     the faintest galaxy with a redshift in that cluster.


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label         Explanations

   1-  7  A7    ----    Cluster       Cluster designation (HHMM+DD) (2)
   8- 10  A3    ---     m_Cluster     [a/b ] Multilicity index on Cluster
  13- 15  I3    ---     Gal           Galaxy identification number (1)
      16  A1    ---     n_Gal         [a] a: Central, giant elliptical galaxy
  18- 21  F4.1  mag     rmag          r magnitude
  24- 29  F6.4  ---     z             Redshfit
  31- 32  I2    h       RAh           Right ascension (J2000)
  34- 35  I2    min     RAm           Right ascension (J2000)
  37- 42  F6.3  s       RAs           Right ascension (J2000)
      44  A1    ---     DE-           Declination sign (J2000)
  45- 46  I2    deg     DEd           Declination (J2000)
  48- 49  I2    arcmin  DEm           Declination (J2000)
  51- 56  F6.3  arcsec  DEs           Declination (J2000)
  58- 61  F4.2  ---     B/T           ? Bulge to total light ratio (GIM2D
                                        parameter) in measurement for galaxies
                                         observed with HST
  64- 67  F4.1  ---     S/N           Signal-to-noise ratio
  69- 73  F5.1  0.1nm   EW0([OII])    ? [O II] dereddened equivalent width
  75- 78  F4.1  0.1nm   e_EW0([OII])  ? rms uncertainty on EW0([OII])
  81- 84  F4.1  0.1nm   EW0(Hdelta)   ? Hδ dereddened equivalent width
  86- 88  F3.1  0.1nm  e_EW0(Hdelta)  ? rms uncertainty on EW0(Hdelta)
  90- 94  F5.1  0.1nm  EW0(Ha+[NII])  ? Hα+[N II] dereddened equivalent
                                        width
  97-100  F4.1  0.1nm e_EW0(Ha+[NII])  ? rms uncertainty on EW0(Ha+[NII])

Note (1): Identification number from the photometric catalogue.
    Serendipitous observations not in the original catalogue have an
    identification number of -99.
    In Simbad, galaxies are identified as [BBS2002] Cl JHHMMa NNN
Note (2): the original table copntained only the RA part of the cluster
    name; the full cluster name (HHMM+DD) was added at CDS.


History:
    From electronic version of the journal
    05-Jun-2003: Two duplicated lines supressed in table4.
(End)                         James Marcout, Patricia Bauer [CDS]    07-Jan-2003