Abell 2142

Abell 2142
Abell 2142
	Chandra X-ray Observatory image of Abell 2142.
Observation data (Epoch J2000)
Constellation(s)	Corona Borealis
Right ascension	15h 58m 19.8s
Declination	+27° 13′ 45.0″
Number of galaxies	> 100
Richness class	2
Bautz–Morgan classification	II
Redshift	0.09090 (27 251 km/s)
Distance	381 Mpc (1,243 Mly) h−1; 0.705
Binding mass	~6.3×1017 M☉
X-ray flux	(6.50 ± 0.70)×10−11 erg s−1 cm−2 (2-10 keV)
	See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

Abell 2142, or A2142, is a huge, X-ray luminous galaxy cluster in the constellation Corona Borealis. It is the result of a still ongoing merger between two galaxy clusters. The combined cluster is six million light years across, contains hundreds of galaxies and enough gas to make a thousand more. It is "one of the most massive objects in the universe."^[1]

^ ^a ^b ^c "Cosmic Pressure Fronts Mapped by Chandra". CXC PR: 00-08. Harvard-Smithsonian Center for Astrophysics. 1 Mar 2000. Retrieved 11 Nov 2008.
^ ^a ^b 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 13, 2012.
^ ^a ^b ^c Cite error: The named reference NED was invoked but never defined (see the help page).

[cxcpr:00-08-1] "Cosmic Pressure Fronts Mapped by Chandra". CXC PR: 00-08. Harvard-Smithsonian Center for Astrophysics. 1 Mar 2000. Retrieved 11 Nov 2008.

[ACO-2] 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 13, 2012.

[NED-3] Cite error: The named reference NED was invoked but never defined (see the help page).

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