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J/A+AS/124/283      BR magnitude and redshift of A1300 (Pierre+ 1997)
Spectroscopic and photometric study of the bright X-ray cluster A1300
    Pierre M., Oukbir J., Dubreuil D., Soucail G., Sauvageot J.-L.,
    Mellier Y.
   <Astron. Astrophys. Suppl. Ser. 124, 283 (1997)>
   =1997A&AS..124..283P      (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Magnitudes ; Redshifts

Keywords: galaxies: clusters: individual: Abell 1300 - X-ray: galaxies -
          galaxies: redshifts

Abstract:
    We present the first results of an optical follow-up of X-ray bright
    clusters of galaxies located between 0.15≤z≤0.31: B and R photometry
    as well as medium resolution spectroscopy of the galaxies. The cluster
    studied here - A1300 - is found to have a redshift of 0.3072 and a
    velocity dispersion of 1210km/s, based on 52 cluster members.
    Structures are observed in the galaxy number counts but the velocity
    histogram shows no significant departure from a Gaussian
    distribution.
Objects:
    -----------------------------------------
       RA   (2000)   DE     Designation(s)
    -----------------------------------------
     11 32.0      -19 54    ACO 1300
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3            29      480   Photometric analysis of A1300
table4            51       64   Spectroscopic analysis of A1300
tables.tex        90      656   LaTeX version of the tables


Byte-by-byte Description of file: table3

   Bytes Format Units   Label     Explanations

   1-  6  F6.1  pix     xpos      x distance from the field center (cD) (1)
   8- 13  F6.1  pix     ypos      y distance from the field center (cD) (1)
  15- 19  F5.2  mag     Rmag      R magnitude (average between 2 frames)
  21- 24  F4.2  mag     B-R       B-R colour index (average between 4 frames)
  26- 29  F4.2  ---     Rmorph    Morphological class in the R band (see text)

Note (1): 1 pix = 0.314"



Byte-by-byte Description of file: table4

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     No        Internal number referring to Fig.7, 8
       4  A1    ---     n_No      [*n] Note on No (1)
   6- 13  F8.4  deg     RAdeg     Right ascension (J2000) (2)
  15- 22  F8.4  deg     DEdeg     Declination (J2000) (2)
  24- 29  F6.4  ---     z         Redshift
  31- 36  F6.4  ---     e_z       Error on the redshift
      38  A1    ---     q_z       [1,2,9] z measurement quality (3)
  40- 44  F5.2  mag     Rmag      ? R magnitude (only for galaxies within the
                                     area processed for photometry)
  46- 49  F4.2  mag     B-R       ? B-R colour index
      51  A1    ---     Member    [YN] Cluster member  galaxy (3sigma clipping
                                    method)

Note (1): *: Presence of emission lines:
              101: H_α
              103: H_α
              115: [OII] at 3727, H_β, [OIII] at 4959 and 5007,
                    OI at 6300 and 6364, H_α, NII at 6549 and 6583,
                    SII at 6717 and 6734
              205: H_α, H_β?
              225: OI at 6300 and 6364
              320: H_α?
              321: H_α? SII at 6717
           n: The two nuclei of the cD galaxy correspond to numbers 121 & 219
               and show totally similar redshifts at the present spectroscopic
               resolution.
Note (2): Galaxy positions were interactively measured on the STScI digitized
           blue sky survey images having a pixel size of 1.7", and should have
           an accuracy of ∼3.4"Note (3): 1: highest peak in the correlation function,
Note (3): 1: highest peak in the correlation function,
          2: 2nd peak,
          9: interactive measurement with lines


Acknowledgements: Marguerite Pierre 

(End)                                         Patricia Bauer [CDS]   24-Jan-1997