1974AJ.....79.1356C
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.
=1958ApJS....3..211A
CORWIN H.G.
=1974AJ.....79.1356C
ZWICKY F., HERZOG E., WILD P., KARPOWICZ M., KOWAL C.T.: 1961-68
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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.
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