ACDS V10.0 - Detailed Description of VIII/50

ACDS V10.0 - Sun Jan 19 18:54:34 CET 2025

| # Detailed Description of VIII/50 : VLA Survey of Rich Clusters of Galaxies (Slee+ 1996) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    VIII/50      VLA Survey of Rich Clusters of Galaxies   (Slee+ 1996)
    ================================================================================
    A VLA survey of rich clusters of galaxies. I. Whole-cluster maps, source list
    and statistics.
         Slee O.B., Perley R.A., Siegman B.C.
        <Aust. J. Phys. 42, 633 (1989)>
        =1989AuJPh..42..633S
    ================================================================================

    A VLA Survey of Rich Clusters of Galaxies II. The Stronger Sources: Maps,
    Polarisations and Identifications
         Slee O.B., Roy A., Savage A.
        <Aust. J. Phys. 47, 145 (1994)>
        =1994AuJPh..47..145S

    A VLA Survey of Rich Clusters of Galaxies III. The Weaker Sources: Maps
    and Identifications
         Slee O.B., Roy A., Andernach H.
        <Aust. J. Phys. 49, 977 (1996)>
        =1996AuJPh..49..977S
    ADC_Keywords: Clusters, galaxy ; Radio sources

    Keywords: galaxies: clusters of - radio continuum: galaxies; surveys -
              radio sources: optical identification

    Description:
        We observed 60 fields towards 57 Abell and one Zwicky cluster of
        galaxies using the Very Large Array (VLA) with scaled arrays at 1.5
        and 4.9 GHz. The source catalogue contains radio and optical
        parameters for 994 sources up to a lower flux limit of 1.0 mJy at 1.5
        GHz and comprises a complete sample above 2.5 mJy. The combined sky
        area within the half-power circle on the maps is 3.5x10-3 sr, and
        the cluster fields are distributed between +35 deg and -30 deg
        declination. The source catalogue list positions, angular size,
        spectral index and optical identification, magnitude and morphology,
        if available.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × paper1.txt        62      937   Radio Sources Towards 58 Galaxy Clusters
    × table1.dat       105       60   Properties of the observed clusters
    × catalog.dat      108     1037  *Radio and optical parameters of sources

    Note on catalog.dat:
        The source catalogues from papers II and III were merged, as well as
        the radio and the optical information joined into a single table. For
        each source only the most likely optical candidates (if any) were
        retained. This merged table replaces the one published in paper I
        (1989AuJPh..42..633S). Tables on structural details of multiple
        sources as published in papers II and III are available upon request
        to the authors.

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

       Bytes Format  Units   Label    Explanations

       1-  7  A7     ---     Field    Name of observed field  (1)
           9  A1     ---     n_Field  [#*x ] Note on the field  (2)
      11- 12  I2     h       RAh      Right ascension (1950) of cluster centre (3)
      14- 17  F4.1   min     RAm      Right ascension of cluster centre(1950) (3)
          19  A1     ---     DE-      Declination sign
      20- 21  I2     deg     DEd      Declination of cluster centre (1950)  (3)
      23- 24  I2     arcmin  DEm      Declination of cluster centre (1950)  (3)
      27- 30  F4.1   arcmin  offRO    Offset of radio field centre from optical
                                        cluster centre
      33- 36  F4.2   ---     offRcl   Offset of radio field centre from optical
                                        cluster centre in units of cluster radii
      38- 43  F6.1   deg     offPA    Position angle of vector from optical
                                       cluster centre to radio field centre
                                       (positive from N through E)
      46- 48  I3     uJy     rms_1.5  ? rms noise of radio map at 1.5 GHz (/beam)
      50- 52  I3     uJy     rms_4.9  ? rms noise of radio map at 4.9 GHz (/beam)
          55  I1     ---     Rclass   Abell richness class of cluster
          57  I1     ---     Dclass   Abell distance class of cluster
      59- 62  F4.1   mag     m10R     red magnitude of 10th brightest galaxy
      64- 69  A6     ---     BMclass  Bautz-Morgan (BM) class of cluster
          70  A1     ---   u_BMclass  [ :] uncertainty flag on BM class
      72- 73  A2     arcmin  Rclu     angular cluster radius  (4)
      76- 79  F4.2   Mpc     Rclin    linear cluster radius (H0=75km/s/Mpc)
      82- 87  F6.4   ---     zclu     cluster redshift
          90  A1     ---     r_zclu   reference for cluster redshift  (5)
      93- 97  F5.2   [10-7W] lgxein   ? log of EINSTEIN X-ray luminosity (6)
          99  A1     ---    n_lgxein  [ R] R= ROSAT measurement converted to
                                        EINSTEIN luminosity scale (see paper)
     101-105  F5.2   [10-7W] lgxros   ? log of ROSAT X-ray luminosity from
                                        Ebeling 1993 (PhD MPE Garching)

    Note (1):
        'A' stands for 'Abell cluster' and Z1518.8 stands for the Zwicky
        cluster Zw1518.8+0747. Two clusters (A 85 and A154) were observed with
        two different field centers.
    Note (2):
      *= The RA is from Abell et al. (1989). The incorrect RA of Abell (1958)
         was used for the radio field centre - hence the large offset.
      #= Data from Abell et al. (1989) =1989ApJS...70....1A
      x= Data from "Catalogue of Galaxies and of Clusters of Galaxies"
         (Zwicky et al. 1961) and Slee & Quinn (1979) =1979PASAu...3..332S
    Note (3):
       The centroid position (B1950) of the optical cluster, mainly from
       Abell (1958) (=1958ApJS....3..211A), but data for three clusters come
       from Abell et al. (1989) (=1989ApJS...70....1A) and Zwicky et al. (1961).
    Note (4):
       Rclu is the cluster radius from the Palomar Sky Survey
       (Struble & Rood 1987 =1987ApJS...63..555S) except that the Abell
       radius (approximately 1.72/z arcmin) is quoted for A3528, Zw1518.8, A4038.
    Note (5):
       Redshift references :
       1  Struble & Rood            =1991ApJS...77..363S
       2  From the m10-z relation   =1994AuJPh..47..145S
            (Slee, Roy & Savage       SRS94, Paper II)
       3  Melnick & Quintana        =1981A&AS...44...87M
       4  Abell et al.              =1989ApJS...70....1A
       5  Beers et al.              =1991AJ....102.1581B
       6  Slee & Reynolds           =1984PASAu...5..516S
       7  Reynolds 1986             =1986USydn.T00J....R
       8  Postman et al.            =1992ApJ...384..404P
    Note (6):
      The EINSTEIN X-ray luminosity in the energy range 0.5-4.5 keV and out
      to a radius of 1Mpc from the cluster centre. The data (scaled to
      Ho=75 km/s/Mpc) are from Jones & Forman (1995, unpublished).

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

       Bytes Format Units   Label     Explanations

       1- 14  A14   ---     Name      Name of cluster (A=Abell, Z=Zwicky)  (1)
          16  A1    ---     multID    [ #] # denotes one of several optical
                                      identifications for the same source
          17  A1    ---     IDnum     Sequence number of optical ID
      20- 21  I2    h       RAh       Right ascension of radio centroid (1950)
      22- 23  I2    min     RAm       Right ascension of radio centroid (1950)
      24- 28  F5.2  s       RAs       Right ascension of radio centroid (1950)
          30  A1    ---     DE-       Declination sign
      31- 32  I2    deg     DEd       Declination of radio centroid (1950)
      33- 34  I2    arcmin  DEm       Declination of radio centroid (1950)
      35- 38  F4.1  arcsec  DEs       Declination of radio centroid (1950)
      40- 41  A2    ---     paper     [23 ] number of paper in which the source was
                                       published ('2 '=II; ' 3'=III; '23'=both)
      43- 46  F4.2  ---     offRcl    projected distance of radio source from
                                      cluster center in units of Rc (see table1)
      48- 53  F6.1  mJy     F1.5      ? integrated 1.5GHz flux density
      55- 59  F5.1  mJy     F4.9      ? integrated 4.9GHz flux density
      61- 64  F4.1  ---     alpha     ? spectral index between 1.5 and 4.9 GHz (2)
      67- 69  I3    arcsec  majax     ?  size of source major axis (deconvolved) (3)
      71- 72  I2    arcsec  minax     ? size of source minor axis (deconvolved) (3)
      74- 76  I3    deg     PosAng    ? position angle of major axis (N thru E)
      78- 81  A4    ---     omorph    optical morphology of most likely ID (4)
          82  A1    ---     l_Rmag    [ >] upper limit flag for Rmag (4)
      83- 86  F4.1  mag     Rmag      ? red magnitude from POSS prints (4)
      88- 91  F4.1  mag     Jmag      ? blue (B_j) magnitude from SERC plates (4)
      94- 95  I2    arcsec  offRO     ? Positional offset of opt. ID with respect
                                       to radio centroid
      97-100  I4    deg     offPA     ? Position angle of vector pointing from radio
                                       centroid to opt. ID (positive N through E)
     103-108  F6.4  ---     z         ? heliocentric redshift of opt. ID, if
                                      available (references see paper)

    Note (1):
        The source name is composed of the name of cluster (A=Abell, Z=Zwicky,
        in A5 format), an underscore symbol, the source running number within
        the observed field (optionally appended by a roman numeral), and an
        optional list of subcomponents (a, ab, abc...) which indicate the
        presence of more detailed structural data in tables 3 and 4 of both
        papers II and III. Note that Z1518 stands for the Zwicky cluster
        Zw1518.8+0747. The source running numbers are those of paper I.
        However, a few of the weak sources listed in Paper I (e.g. A0133_10)
        were omitted because subsequent analysis showed that they were
        probably spurious. To avoid later confusion, the additional sources
        are inserted in the Table at the correct right ascension but are given
        an extra lower case Roman numeral. For example, the source A0013_13 in
        table 2 of paper I is now A0013_13i, while the source A001313iiab of
        slightly later RA (as well as two components a and b) has been
        inserted in the present source list. In one case two sources (A1913_6
        and A1913_8) were merged to a single source (A1913_6,8).
    Note (2):
        The spectrum is defined as F(freq)~freqalpha. The spectral index is
        between 1.5 and 4.9 GHz. When no 4.9 GHz flux is listed in the table,
        the spectral index is between 1.5 GHz and another frequency taken from
        references quoted in the printed version of the papers.
    Note (3):
        An elliptical Gaussian was fitted to the source. The quoted values are
        the full widths at half power, deconvolved with the antenna beam, and
        corrected for bandwidth smearing.
    Note (4):
      The optical identifications were classified into the following categories:
      E    = elliptical galaxy (ie. visibly extended, surrounded by a
             diffuse structureless halo with axial ratio <~2
      D    = elliptical galaxy several times larger than all neighbouring
             galaxies if well away from cluster centre
      cD   = same as D if close to the cluster centre
      DB   = two barely resolved elliptical galaxies (dumb-bell galaxy)
      G    = galaxy (diffuse image too faint to assign a galaxy class)
      Q    = quasar known from literature
      S0   = as 'E' above but with an axial ratio >~2
      Sp   = spiral galaxy (galaxy with considerable structure in the halo)
      St   = image with a sharp circular boundary and sometimes showing
             diffraction spikes

      The symbol 'x2' is appended to double objects, for which the summed
      magnitude is quoted in the subsequent columns. Very faint images are
      difficult to assign to the G or St categories and often the choice is
      rather arbitrary. If an image was detected on the Bj plates, but not
      on the red POSS prints a conservative upper limit of ">19.5" is quoted
      for the red magnitude.

    ================================================================================
    (End)                               Heinz Andernach [IUE Vilspa]     23-Oct-1996