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ZWICLU : ZWICKY Catalogue of clusters of galaxies
Contents
Table name: ZWICLU
Records: 9134
Spectral Band: OPT
Kind of Object: Cluster of Galaxies
Mode: General
PreView:
Coordinates: B1950
Reference
- Zwicky F. et al.: Catalogue of galaxies and of clusters of galaxies,
California Institute of Technology, 1961-1968, 6 voll.
- Vol. I : Zwicky F., Herzog E., Wild P., 1961, PSS fields of the
declination zones 0, +6, +12 deg. between 7 and 18 hours in right
ascension
- Vol. II : Zwicky F., Herzog E., 1963, PSS fields of the declination
zones +18, +24, +30 deg. between 6:30 and 18:30 hours in right
ascension
- Vol. III: Zwicky F., Herzog E., 1966, PSS fields of the declination
zones +36, +42, +48, +54, deg. between 5:30 and 20:00 hours in right
ascension
- Vol. IV : Zwicky F., Herzog E., 1968, PSS fields of the declination
zones +60, +66, +72, +78, +84, +90 deg.
- Vol. V : Zwicky F., Karpowicz M., Kowal C.T., 1965, PSS fields of the
declination zones 0, +6, +12, +18 deg. between 19:30 and 6 hours in
right ascension
- VI : Zwicky F., Kowal C.T., 1968, PSS fields of the declination
zones +24, +30, +36, +42, +48, +54, in the southern galactic cap
Description
This catalogue contains a list of cluster of galaxies to the limit of
the 48 inch Scmidt telescope on the Palomar Mountain.
It includes only rich clusters containing at least 50 galaxies
in the luminosity range from m_max to m_max+3 where m_max is
the apparent photographic magnitude of the brightest galaxy
in the cluster. The positions are given to the nearest
minute of arc in declination and to the nearest tenth of a
minute of time in right ascension. The distance classes are
classified as follows :
- Near RADVEL <= 15000Km/s
- MD = medium distant 15000Km/sec < RADV EL <= 30; 000Km/sec
- D = distant 30; 000Km/sec < RADV EL <= 45; 000Km/sec
- VD = very distant 45000Km/sec < RADV EL <= 60; 000Km/sec
- ED = extremely distant 60000Km=sec < RADV EL
The population of a cluster is the number of galaxies actually
counted within the outline of that cluster as given on the
chart minus the estimated number of background galaxies in the
same area.
The diameter of the cluster is defined as that of a circle
overing approximately the same area as the cluster on the
original Survey plate.
Fields
Name Type Meaning
number I Order number
r_a I Right Ascension
dec I Declination
type I Type:
1 : open cluster
2 : medium compact cluster
3 : compact cluster
pop I Population in number of galaxies
diam F Diameter in cm. on the PSS plate
dist I Distance class (see above)
nf1 I identification : field number
n1 I " : cluster number
nf2 I identification : field number
n2 I " : cluster number
nf3 I identification : field number
n3 I " : cluster number
nf4 I identification : field number
n4 I " : cluster number
Derived Quantities
_diam F Diameter in '
_ra F J2000 Right Ascension
_de F J2000 Declination
_lii F Galactic Longitude
_bii F Galactic Latitude
_L F SuperGalactic Longitude
_B F SuperGalactic Latitude