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J/A+A/432/381      VLT spectroscopic survey of RX J0152.7-1357  (Demarco+, 2005)
A VLT spectroscopic survey of RX J0152.7-1357,
a forming cluster of galaxies at z=0.837.
    Demarco R., Rosati P., Lidman C., Homeier N.L., Scannapieco E., Benitez N.,
    Mainieri V., Nonino M., Girardi M., Stanford S.A., Tozzi P., Borgani S.,
    Silk J., Squires G., Broadhurst T.J.
   <Astron. Astrophys. 432, 381 (2005)>
   =2005A&A...432..381D
ADC_Keywords: Clusters, galaxy ; Surveys ; Redshifts

Keywords: galaxies: clusters: general - techniques: spectroscopic -
          X-ray: galaxies: clusters -
          galaxies: clusters: individuals: RX J0152.7-1357

Abstract:
    We present the results of an extensive spectroscopic survey of
    RX J0152.7-1357, one of the most massive distant clusters of galaxies
    known. Multi-object spectroscopy, carried out with FORS1 and FORS2 on
    the ESO Very Large Telescope (VLT), has allowed us to measure more
    than 200 redshifts in the cluster field and to confirm 102 galaxies as
    cluster members. The mean redshift of the cluster is z=0.837±0.001
    and we estimate the velocity dispersion of the overall cluster galaxy
    distribution to be ∼1600km/s.

Description:
    Spectroscopic catalogs of cluster members and field galaxies in the
    field of RX J0152.7-1357. The spectroscopic data have been obtained
    with VLT/FORS under seeing conditions of <0.8". For cluster members,
    the following information is given: equatorial coordinates (J2000),
    redshift and error in redshift, emission line flag indicating presence
    of emission features in galaxy spectra, most prominent spectral
    features and spectroscopic type as defined in Dressler et al. (1999,
    Cat. J/ApJS/122/51). For field galaxies only equatorial coordinates
    (J2000), redshift and error in redshift are given.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
members.dat      104      102   Spectroscopic information of cluster members
fields.dat        46       85   Spectroscopic information of field galaxies


See also:
 J/ApJS/122/51 : Spectroscopic cat. of 10 rich galaxy clusters (Dressler+ 1999)


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

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Seq       Galaxy ID number
       5  A1    ---     m_Seq     [b] Multiplicity index on Seq
   7-  8  I2    h       RAh       Right ascension (J2000.0)
  10- 11  I2    min     RAm       Right ascension (J2000.0)
  13- 17  F5.2  s       RAs       Right ascension (J2000.0)
      19  A1    ---     DE-       Declination sign (J2000.0)
  20- 21  I2    deg     DEd       Declination (J2000.0)
  23- 24  I2    arcmin  DEm       Declination (J2000.0)
  26- 29  F4.1  arcsec  DEs       Declination (J2000.0)
  31- 36  F6.4  ---     z         Galaxy redshift
  38- 43  F6.4  ---     e_z       Error in redshift
      45  I1    ---     Em        [0,2] Emission line flag
  47- 92  A46   ---     SpecFeat  Detected Spectral Features
  95-104  A10   ---     SpClass   Spectral Classification (1)

Note (1): Spectral classification following Dressler et al. (1999,
           Cat. J/ApJS/122/51) classification:
 -----------------------------------------------------------------------------
 Class  [OII]3727 EW Hδ Comments
                     (Å)
 -----------------------------------------------------------------------------
 k       Absent     < 3       Passive
 k+a     Absent       3-8     Moderate Balmer absorption without emission
 a+k     Absent     ≥8       Strong Balmer absorption without emission
 e(c)    Yes, <40   < 4       Moderate Balmer absorption plus emission,
                               spiral-like
 e(a)    Yes        ≥4       Strong Balmer absorption plus emission
 e(b)    ≥40                 Starburst
 e(n)                         AGN from broad lines or [O III] 5007/Hβ ratio
 e       Yes          ?       With at least one emission line but S/N too low
                               to classify


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

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Seq       Galaxy ID number
   7-  8  I2    h       RAh       Right Ascension J2000 (hours)
  10- 11  I2    min     RAm       Right Ascension J2000 (minutes)
  13- 17  F5.2  s       RAs       Right Ascension J2000 (seconds)
      20  A1    ---     DE-       Declination J2000 (sign)
  21- 22  I2    deg     DEd       Declination J2000 (degrees)
  24- 25  I2    arcmin  DEm       Declination J2000 (minutes)
  27- 30  F4.1  arcsec  DEs       Declination J2000 (seconds)
  33- 38  F6.4  ---     z         Galaxy redshift
  41- 46  F6.4  ---     e_z       Error in redshift


Acknowledgements: Ricardo Demarco, demarco(at)pha.jhu.edu

(End)                                        Patricia Vannier [CDS]  25-Nov-2004