The Abell catalogue is a catalogue of approximately 4,000 galaxy clusters with at least 30 members, almost complete to a redshift of z = 0.2. It was originally compiled by the American astronomer George O. Abell in 1958 using plates from POSS, and extended to the southern hemisphere by Abell, Corwin and Olowin in 1987. The name "Abell" is also commonly used as a designation for objects he compiled in a catalogue of 86 planetary nebulae in 1966. The proper designation for the galaxy clusters is ACO, as in "ACO 13", while the planetary-nebula designation is the single letter A, as in "A 39".
^Clavin, Whitney; Jenkins, Ann; Villard, Ray (7 January 2014). "NASA's Hubble and Spitzer Team up to Probe Faraway Galaxies". NASA. Retrieved 8 January 2014.
^ a b c d"NASA/IPAC Extragalactic Database". NASA/IPAC Extragalactic Database (NED). Retrieved March 15, 2012.
^ a b"The VizieR Catalogue Service". Strasbourg Astronomical Observatory, UdS/CNRS, Strasbourg, France. Retrieved March 15, 2012.
^Abell, George O.; Corwin, Harold G. Jr.; Olowin, Ronald P. (May 1989). "A catalog of rich clusters of galaxies" (PDF). Astrophysical Journal Supplement Series. 70 (May 1989): 1–138. Bibcode:1989ApJS...70....1A. doi:10.1086/191333. ISSN 0067-0049. Retrieved March 16, 2012.
^Reichert G, Mason KO, Charles PA, Bowyer S, Lea SM, Pravdo S (Aug 1981). "Low energy X-ray emission from five galaxy cluster sources". Astrophys. J. 247: 803–12. Bibcode:1981ApJ...247..803R. doi:10.1086/159092.
^ESO-A Galactic Crash Investigation
^NASA: Hubble Views a Double Cluster of Glowing Galaxies