Abell catalogue

The Abell catalog (English: Abell catalog of rich clusters of galaxies ) is a catalog of 4073 clusters of galaxies. Each of these clusters contains at least 50 galaxies between the brightness of the third brightest bunch member, and two magnitudes weaker (). In addition, must have at least 50 members who are assuming a Hubble constant of H = 70km/s/Mpc, in a radius of 2Mpc, called Abell radius. The redshifts of the pile to go nominally, in fact, larger values ​​for a number of Abell clusters measured later.

The first version of the catalog was published by George Ogden Abell 1958, due to inspection of the red-sensitive images of the Palomar Observatory Sky Survey using a magnifying glass and contained 2712 clusters of galaxies. Were supplemented with 1361 clusters from the previously unrecognized parts of the southern sky, which were, using photographs of the UK Schmidt Telescope found in 1989. In addition to the coordinates figures for the number of members, compactness and approximate distance of the cluster have been specified.

Examples

• Abell 262 in the constellation Andromeda.
• Abell 520 in the constellation of Orion.
• Abell 901 in the constellation Leo, together with Abell 902 a supercluster.
• Abell S0373 Fornax cluster of galaxies: the second closest galaxy clusters.
• Abell 1656 Coma cluster of galaxies: one of the most well-known galaxy clusters.
• Abell 1689 in the constellation Virgo, one of the most massive objects known in the universe.
• Abell 1835 in the constellation Virgo.
• Abell 2667 in the constellation Sculptor, by a hurtling comet galaxy.
• Abell 3266 in the southern sky, one of the largest mass concentrations in the nearby universe.