Abell 1991

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Abell 1991
Observation data (Epoch J2000)
Right ascension 14h 54m 30.2s[1]
Declination+18° 37′ 51″[1]
Richness class1 [2]
Bautz–Morgan classificationI [2]
Redshift0.05870 (17 598)[1]
249 Mpc (812 Mly) h−1
ICM temperature2.61 keV[3]
Binding mass1.23×1014[3] M
X-ray flux(9.40 ± 16.7%)×1012 erg s−1 cm−2 (0.1–2.4 keV)[1]
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

Abell 1991 is a galaxy cluster in the Abell catalogue.

See also[edit]


  1. ^ a b c d e "NED results for object ABELL 1991". NASA/IPAC Extragalactic Database (NED). Retrieved March 17, 2012.
  2. ^ a b Abell, George O.; Corwin, Harold G., Jr.; Olowin, Ronald P. (May 1989). "A catalog of rich clusters of galaxies". Astrophysical Journal Supplement Series. 70 (May 1989): 1–138. Bibcode:1989ApJS...70....1A. doi:10.1086/191333. ISSN 0067-0049.
  3. ^ a b Table 4 from Vikhlinin, A.; Kravtsov, A.; Forman, W.; Jones, C.; Markevitch, M.; Murray, S. S.; Van Speybroeck, L. (April 2006). "Chandra Sample of Nearby Relaxed Galaxy Clusters: Mass, Gas Fraction, and Mass-Temperature Relation". The Astrophysical Journal. Chicago, Illinois, USA. 640 (2): 691–709. arXiv:astro-ph/0507092. Bibcode:2006ApJ...640..691V. doi:10.1086/500288.

Coordinates: Sky map 14h 54m 30.2s, +18° 37′ 51″