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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 Jr. H.G.
<Astron. J. 79, 1356 (1974)>
=1974AJ.....79.1356C
Zwicky F., Herzog E., Wild P., Karpowicz M., Kowal C.T.
<Catalogue of galaxies and of clusters of galaxies,
California Institute of Technology, Pasadena, 6 vols.(1961-68>
=1961CGCG..C......0Z
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ADC_Keywords: Clusters, galaxy
Description:
The catalog was originally prepared at the Bulgarian Academy of Sciences.
The Abell clusters are rich, compact clusters of galaxies identified by
Abell (1958). These clusters were identified on the red plates of the
Palomar Observatory Sky Survey (POSS). The Zwicky clusters were identified
by Zwicky et al. (1961-68) in 506 POSS fields. They are rich clusters,
each having at least 50 members within 3 mag of the brightest
member. The catalog includes cluster identification, several coordinate
systems, magnitude of the tenth brightest cluster member, distance groups,
richness groups, size, mean apparent population, and distance.
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.dat 130 2712 Abell Clusters (Abell, 1958; Corwin, 1974)
zwicky.dat 130 9134 Zwicky Clusters (Zwicky et al., 1961-68)
zwindex.dat 130 9134 Zwicky Clusters index
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Byte-by-byte Description of file: abell.dat
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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.dat
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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.dat.
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Byte-by-byte Description of file: zwindex.dat
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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