Detailed Description of Catalogue VII/4A/

Url: http://astro.u-strasbg.fr/cgi-bin/Cat?VII/4A/

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VII/4A              Abell and Zwicky Clusters of Galaxies   (Abell+ 1974)
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Catalogue of Abell and Zwicky Clusters of Galaxies
     ABELL G.O.
    <Astrophys. J. Suppl. Ser. 3, 211 (1958)>
    =1958ApJS....3..211A
     CORWIN H.G.
    <Astron. J. 79, 1356 (1974)>
    =1974AJ.....79.1356C
     ZWICKY F., HERZOG E., WILD P., KARPOWICZ M., KOWAL C.T.: 1961-68
    <Catalogue of galaxies and of clusters of galaxies,
     California Institute of Technology, Pasadena, 6vols.>
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ADC_Keywords: Clusters, galaxy ;

Description:
    See the complete documentation written by Robert S. Hill (file adc.doc)

File Summary:

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  FileName      Lrecl  Records   Explanations

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ReadMe             80        .   This file
adc.doc            80      614   Documentation written by Robert S. Hill
abell             130     2712   Abell Clusters (Abell, 1958; Corwin, 1974)
zwicky            130     9134   Zwicky Clusters (Zwicky et al., 1961-68)
zwindex           130     9134   Zwicky Clusters index

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Byte-by-byte Description of file: abell

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   Bytes Format  Units   Label    Explanations

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   2-  5  I4     ---     Abell    Abell cluster number
       7  I1     ---     n_Abell  [1/2] '2' if in Abell's statistical sample,
                                        '1' if not
   9- 10  I2     h       RAh      Hours RA, 1950.0
  12- 15  F4.1   min     RAm      Minutes RA, 1950.0
      17  A1     ---     DE-      Sign Dec, 1950.0
  18- 19  I2     deg     DEd      Degrees Dec, 1950.0
  21- 22  I2     arcmin  DEm      Minutes Dec, 1950.0
  25- 28  F4.1   mag     Mag10    Magnitude of 10th brightest cluster member
      31  I1     ---   DistGroup  [0/7] Distance group (1)
      34  I1     ---   RichGroup  [0/5] Richness group (2)
  37- 42  F6.2   deg     GLON     Galactic longitude
  44- 49  F6.2   deg     GLAT     Galactic latitude
  52- 58  F7.4   ---     RLamb    Lambert distance from pole (3)
  60- 66  F7.4   ---     XLamb    Lambert X coordinate (3)
  68- 74  F7.4   ---     YLamb    Lambert Y coordinate (3)
  77- 82  F6.2   deg     SGLON    Supergalactic longitude (de Vaucouleur's
                                    system)
  84- 89  F6.2   deg     SGLAT    Supergalactic latitude
  92- 95  F4.2   deg     ClusRad  Corrected Abell cluster radius
  98-103  F6.3   deg2   ClusArea  Cluster area computed from ClusRad
 106-109  I4     ct/deg2 Pop      Mean apparent population (galaxies/sq.deg)
 112-114  I3     Mpc     Dist     Radial distance to cluster
 117-120  I4     Mpc     DistX    X component of Distance
 122-125  I4     Mpc     DistY    Y component of Distance
 127-130  I4     Mpc     DistZ    Z component of Distance

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Note (1): DistGroup is Based on the magnitude of the 10th brightest member;
   it is defined as follows:
   '0'= < 13.3                  '4'= 15.7 - 16.4
   '1'= 13.3 - 14.0             '5'= 16.5 - 17.2
   '2'= 14.1 - 14.8             '6'= 17.3 - 18.0
   '3'= 14.9 - 15.6             '7'= > 18.0
Note (2): RichGroup depends on galaxy counts as follows:
   '0'= 30 - 40                 '3'= 130 - 199
   '1'= 50 - 79                 '4'= 200 - 299
   '2'= 80 - 129                '5'= 300 or over.
Note (3): The Lambert projection is an equal-area projection, where the
    distance to the center (nearest galactic pole) RLamb is defined by:
        RLamb = 2 sin (theta/2)     where theta = polar distance = (90-b)
    and the position angle is the longitude.
    RLamb is negative for clusters located in southern galactic hemisphere.
    The cartesian values XLamb and YLamb are defined by:
        XLamb = RLamb sin(l)        (component directed toward l=90deg)
        YLamb = RLamb cos(l)        (component directed toward l=0deg)
    RLamb, XLamb and YLamb are therefore in range [-sqrt(2), +sqrt(2)]

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Byte-by-byte Description of file: zwicky

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   Bytes Format  Units   Label    Explanations

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   2-  5  I4     ---     Zwicky   Zwicky cluster number
   8-  9  I2     h       RAh      Hours RA, 1950.0
  11- 14  F4.1   min     RAm      Minutes RA, 1950.0
      17  A1     ---     DE-      Sign Dec, 1950.0
  18- 19  I2     deg     DEd      Degrees Dec, 1950.0
  21- 22  I2     arcmin  DEm      Minutes Dec, 1950.0
      26  I1     ---     Type     [1/3] Cluster type (1)
  30- 33  I4     ---     GalCnt   Population of cluster (number of galaxies)
  37- 40  F4.1   cm      Diam     Diameter of cluster
      44  I1     ---   DistGroup  Distance group (2)
  48- 53  F6.2   deg     GLON     Galactic longitude
  56- 61  F6.2   deg     GLAT     Galactic latitude
  65- 71  F7.4   ---     RLamb    Lambert distance from pole (3)
  74- 80  F7.4   ---     XLamb    Lambert X coordinate (3)
  83- 89  F7.4   ---     YLamb    Lambert Y coordinate (3)
  93- 98  F6.2   deg     SGLON    Supergalactic longitude, de Vaucouleur's
                                    system
 101-106  F6.2   deg     SGLAT    Supergalactic latitude
 110-113  F4.2   deg     ClusRad  Cluster radius: 0.09326 * Diam
 116-122  F7.3   deg2   ClusArea  Cluster area: 0.02733 * Diam**2
 126-130  I5     ct/deg2 Pop      Mean apparent population (galaxies/sq.deg)

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Note (1): Cluster type is '1'=open; '2'=medium compact; '3'=compact
Note (2): DistGroup is:
        '1'= near               '4'= very distant
        '2'= medium distant     '5'= extremely distant
        '3'= distant
Note (3): Lambert projection is explained above in Note(3) of file: abell.

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Byte-by-byte Description of file: zwindex

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   Bytes Format  Units   Label    Explanations

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   2-  5  I4     ---     Zwicky   Zwicky cluster number
   8-  9  I2     h       RAh      Hours RA, 1950.0
  11- 14  F4.1   min     RAm      Minutes RA, 1950.0
      17  A1     ---     DE-      Sign Dec, 1950.0
  18- 19  I2     deg     DEd      Degrees Dec, 1950.0
  21- 22  I2     arcmin  DEm      Minutes Dec, 1950.0
  25- 27  I3     ---     Area1    [1/559]? Plate area containing cluster (1)
  29- 31  I3     ---     Number1  [1/120]? Cluster number within plate area (1)
  34- 36  I3     ---     Area2    [1/559]? Plate area containing cluster (1)
  38- 40  I3     ---     Number2  [1/120]? Cluster number within plate area (1)
  43- 45  I3     ---     Area3    [1/559]? Plate area containing cluster (1)
  47- 49  I3     ---     Number3  [1/120]? Cluster number within plate area (1)
  52- 54  I3     ---     Area4    [1/559]? Plate area containing cluster (1)
  56- 58  I3     ---     Number4  [1/120]? Cluster number within plate area (1)
  61- 63  I3     ---     Area5    [1/559]? Plate area containing cluster (1)
  65- 67  I3     ---     Number5  [1/120]? Cluster number within plate area (1)
  70- 72  I3     ---     Area6    [1/559]? Plate area containing cluster (1)
  74- 76  I3     ---     Number6  [1/120]? Cluster number within plate area (1)
  79- 81  I3     ---     Area7    [1/559]? Plate area containing cluster (1)
  83- 85  I3     ---     Number7  [1/120]? Cluster number within plate area (1)
  88- 90  I3     ---     Area8    [1/559]? Plate area containing cluster (1)
  92- 94  I3     ---     Number8  [1/120]? Cluster number within plate area (1)
  97- 99  I3     ---     Area9    [1/559]? Plate area containing cluster (1)
 101-103  I3     ---     Number9  [1/120]? Cluster number within plate area (1)
 106-108  I3     ---     Area10   [1/559]? Plate area containing cluster (1)
 110-112  I3     ---    Number10  [1/120]? Cluster number within plate area (1)
 115-117  I3     ---     Area11   [1/559]? Plate area containing cluster (1)
 119-121  I3     ---    Number11  [1/120]? Cluster number within plate area (1)
 124-126  I3     ---     Area12   [1/559]? Plate area containing cluster (1)
 128-130  I3     ---    Number12  [1/120]? Cluster number within plate area (1)

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Note (1):
    Up to 12 Zwicky plate numbers and cluster numbers within the plates
    (a cluster often spreads into several plate areas). Pairs are sorted
    in order of increasing order of plate-area number.

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Historical Notes:
  * The catalogue has been prepared initially by the Bulgarian Academy of
    Sciences
  * See in "adc.doc" file, section 4, from the
    "Selected Astronomical Catalogs" Vol. 1 CD-ROM (1992), directory:
    /cd6/nonstell/galaxies/abzwclus
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(End)                                    Francois Ochsenbein [CDS]   12-Apr-1995

CDS Catalogue Service