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J/AJ/106/1273    Kinematics of dense clusters of galaxies      (Zabludoff+ 1993)
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The kinematics of dense clusters of galaxies. I. The data.
     Zabludoff A.I., Geller M.J., Huchra J.P., Vogeley M.S.
    <Astron. J. 106, 1273 (1993)>
    =1993AJ....106.1273Z
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ADC_Keywords: Clusters, galaxy; Radial velocities; Velocity dispersion

Abstract:
    We have measured redshifts in the fields of the 31 R>=1 Abell clusters
    with 0.02<z<0.05 and |bII|>30{deg}, from medium resolution spectra (5
    or 7{AA}). At least ten of the fields are severely contaminated by
    superimposed velocity peaks. We derive the mean velocities and
    velocity dispersions of the 25 dense peaks in the sample.

    The abundance of peaks, 6.6x10^-6^h^3^ Mpc^-3^, is consistent with the
    mean number density of R>1 Abell clusters (Bahcall & Soneira
    1983ApJ...270...20B). The range of velocity dispersions is 304-1346
    km/s. The median dispersion is 718 km/s. The subset of eight systems
    with cD galaxies has a median velocity dispersion of 792 km/s, close
    to that of non-cD systems (626 km/s). When these data are combined
    with 16 cD cluster velocity dispersions from our previous study
    (Zabludoff et al. 1990ApJS...74....1Z, and Dunn [Proceedings of NATO
    Conf. 1991]), eight of 25 cD galaxies have peculiar motions larger
    than half the cluster velocity dispersions. These findings further
    support the conclusions of Beers & Geller (1983ApJ...274..491B), and
    Dunn (1991), who argue that cD galaxies do not lie in the global
    kinematic center, but in local potential minima. If so, systems with
    speeding cD's are probably a guide to substructure in dynamically
    evolving systems.

File Summary:
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 FileName   Lrecl  Records    Explanations
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ReadMe         80        .    This file
table1.dat     64      564    Cluster data
table2.dat     80       47    Peak velocity dispersions
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units   Label    Explanations
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   1-  5  A5     ---     Cluster  Abell cluster designation
   7- 22  A16    ---     Galaxy   Galaxy name (1)
  24- 25  I2     h       RAh      Right Ascension 1950 (hours)
  27- 28  I2     min     RAm      Right Ascension 1950 (minutes)
  30- 33  F4.1   s       RAs      Right Ascension 1950 (seconds)
      35  A1     -       DE-      Declination 1950 (sign)
  36- 37  I2     deg     DEd      Declination 1950 (degrees)
  39- 40  I2     arcmin  DEm      Declination 1950 (minutes)
  42- 43  I2     arcsec  DEs      Declination 1950 (seconds)
  47- 51  F5.2   mag     B(0)     []? Integrated magnitude
      52  A1     ---     n_B(0)   [RMCPHK] Origin of B(0) (2)
  55- 59  I5     km/s    RV       Velocity
  62- 64  I3     km/s    e_RV     Mean error on V
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Note (1): Names with RA given with five digits are normally from
    Zwicky catalogues; the other (with four digits in RA, starting or
    not with the letter A) are anonymous galaxies.
Note (2):
    C = CCD photometry (CfA redshift survey 1992)
    H = Zwicky magnitude split by observers
    K = Markarian catalogue of galaxies (1967)
    M = MCG (Vorontsov-Velyaminov et al. 1962-68)
    P = observer's eye estimate
    R = RC1 (de Vaucouleurs & de Vaucouleurs 1964)
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Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label     Explanations
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   1-  5  A5     ---    Cluster   Abell cluster designation
   7- 14  A8    ---     Peak      Peak name (1)
  15- 16  A2    ---   n_Peak      Note (2)
  18- 19  I2    h       RAh       Right ascension (1950.0)
  21- 24  F4.1  min     RAm       Right ascension (1950.0)
      26  A1    ---     DE-       Declination sign (1950.0)
  27- 28  I2    deg     DEd       Declination (1950.0)
  30- 31  I2    arcmin  DEm       Declination (1950.0)
  33- 35  I3    ---     Ntot      Total number of redshifts in the field
  38- 43  F6.3 10+3km/s Vlow      Velocity limit which enclose member galaxies
      45  A1    ---     ---       [-]
  47- 50  F4.1 10+3km/s Vup       Velocity limit which enclose member galaxies
  53- 55  I3    ---     Nc        Number of member galaxies
  58- 62  I5    km/s    <v>       Mean velocity
  64- 66  I3    km/s  e_<v>       rms uncertainty on mean velocity
  69- 72  I4    km/s    sigma     Line-of-sight velocity dispersion
  74- 76  I3    km/s  E_sigma     Error on sigma (upper limit)
  78- 80  I3    km/s  e_sigma     Error on sigma (lower limit)
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Note (1): Peak name:
     Peak name in the form A119A, or [A154B].
Note (2): Notes:
     d: dense cluster sample
     c: cD cluster
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History:
  * 20-Apr-1994: Keypunched at CDS
  * 24-Sep-2001: error communicated by H.A. Andernach:
    name corrected for galaxy at 14 00 06.4 -11 26 36
  * 01-Jan-2002: table2 added
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(End)                                    Francois Ochsenbein [CDS]   20-Apr-1994