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J/AJ/112/36                Velocities in Abell 3266 (Quintana+ 1996)
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Dynamics of the cluster of galaxies A3266 (SERSIC 40/6). I. Spectroscopic data
       Quintana H., Ramirez A., Way M.J.
      <Astron. J. 112, 36 (1996)>
      =1996AJ....112...36Q      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Galaxies, spectra ; Radial velocities

Abstract:
    We present 387 velocities covering an area 1.8x1.8deg^2^, including
    229 new galaxy velocities obtained from 309 spectra, of which 317
    appear to be cluster members according to our analysis. Based on this
    extended velocity sample we reanalyzed the velocity structure of the
    cluster. We found a strongly decreasing velocity dispersion profile
    that, as well as the mean velocity, shows significant radial scatter.
    Inside the 2.5h_50_^-1^Mpc radius, the velocity dispersion has a value
    of 1306+/-73km/s, while further out than 3h_50_^-1^Mpc it falls below
    800km/s. The global dispersion is 1085+/-51km/s. We found a remarkable
    velocity substructure, which we interpret as a tidal outgoing arm
    reaching from the center to the northernmost extensions surveyed. The
    arm could be produced by a recent merger with another cluster, that
    moved from the front and SW direction and scattered from the main
    cluster core into the arm. This model allows us to derive an epoch for
    the collision between the more massive core and the front edge of the
    incoming cluster of 4x10^9^h_50_^-1^yr ago and of ~2x10^9^h_50_^-1^yr
    for the merging of both cores. Formation of the dumb-bell is a later
    merger process of the two BCMs, consistent with theoretical estimates.
    The collision picture is also consistent with the distorted X-ray
    image. The very northernmost parts of the arm could, alternatively, be
    interpreted as ongoing infall of a few outlying loose groups. The
    suggestion of a faint galaxy system within 400h_50_^-1^kpc, satellite
    to the central dumb-bell, is maintained in spite of the large central
    velocity dispersion value; however, confirmation requires data for
    further compact faint members. From several mass estimators we derived
    a cluster dynamical mass value of 5x10^15^h_50_^-1^M_{sun}_, but this
    value should be seen in the merger context described.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             68      592   A3266 - Velocities.
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Byte-by-byte Description of file: table1
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   Bytes Format Units   Label    Explanations
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   1-  5  I5    ---     Id       Identification number
   7-  8  I2    h       RAh      Right ascension (1950)
  10- 11  I2    min     mAh      Right ascension (1950)
  13- 16  F4.1  s       RAs      Right ascension (1950)
      18  A1    ---     DE-      Declination sign
  19- 20  I2    deg     DEd      Declination (1950)
  22- 23  I2    arcmin  DEm      Declination (1950)
  25- 28  F4.1  arcsec  DEs      Declination (1950)
  30- 34  I5    km/s    Vel      Velocity
  36- 38  I3    km/s  e_Vel      rms uncertainty on Vel
  40- 43  F4.1  Mpc     R        ? R Tonry and Davis (1979AJ.....84.1511T) value
      45  A1    ---     Note     [*e] emission/uncertainty (1)
  47- 51  A5    ---     Ref      References (2)
  53- 57  A5    ---     IdRef    Fiber or galaxy number in the references (3)
  59- 63  I5    km/s    VelAdop  ? Adopted final velocity
  65- 67  I3    km/s  e_VelAdop  ? rms uncertainty on VelAdop
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Note (1): e: presence of emission lines
          *: Velocities noted as uncertain by TCG90 that presents a great
              disagreement with our data
Note (2): This paper: argu = ARGUS spectra
                      fibr = LCO fiber spectra
                      shec = re-measured by Quintana and Ramirez
                                                          (1990AJ....100.1121Q)
          Others: C085  = Carter et al. (1985MNRAS.212..471C)
                  G088  = Green et al. (1988MNRAS.234.1051G)
                  M082  = Materne et al. (1982A&A...109..238M)
                  MQ81a = Melnick and Quintana (1981A&AS...44...87M)
                  MQ81b = Melnick and Quintana (1981AJ.....86.1567M)
                  TCG90 = Teague et al. (1990ApJS...72..715T)
                  V075  = Vidal (1975PASP...87..625V)
                  W080  = West and Frandsen (1981A&AS...44..329W)
Note (3): A negative value indicates that the velocity was not used in the
           calculation
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History: Prepared via OCR at CDS.
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(End)                           James Marcout, Patricia Bauer [CDS]  10-Apr-1997