Abell 665

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Abell 665
Abell 665 (Chandra).jpg
Chandra X-ray image of Abell 665
Credit: NASA
Observation data (Epoch J2000)
Constellation(s)Ursa Major
Right ascension08h 30m 45.2s[1]
Declination+65° 52′ 55″[1]
Brightest member2MASX J08305736+6550299 [2][3]
Richness class5[4]
Bautz-Morgan classificationIII[1]
Velocity dispersion1 390+120
720 Mpc (2,348 Mly) h−1
ICM temperature7.7 ± 0.4 keV (r ≲ 100 h−1
Binding mass~1015 h−1
[2] M
X-ray flux(11.8 ± 15.6%)×1012 erg s−1 cm−2 (0.1—2.4 keV)[1]
See also: Galaxy groups, Galaxy clusters, List of galaxy clusters

Abell 665 is a galaxy cluster in the Abell catalogue in the constellation Ursa Major. It is also known as the only cluster in his 1989 catalog to receive Abell's highest richness class of 5. This means that it contains at least 300 galaxies in the magnitude range of m3 to m3+2, where m3 is the magnitude of the third-brightest member of the cluster. The clusters in all other richness classes contain less than 300 such galaxies. Abell 665's combination of high brightness and large distance, made it an excellent candidate along with 37 other clusters to help determine the Hubble constant using the Sunyaev–Zel'dovich effect in 2006.[5]

Member velocity, cluster velocity dispersion, and X-ray data suggest that Abell 665 is composed of two similar-mass clusters which are at or very close to core crossing, give or take ≲ 0.5 gigayears.[2]


See also[edit]


  1. ^ a b c d e f "NED results for object ABELL 0665". NASA/IPAC Extragalactic Database (NED). Retrieved March 16, 2012.
  2. ^ a b c d Gómez, Percy L.; Hughes, John P.; Birkinshaw, Mark (September 2000). "A Merger Scenario for the Dynamics of Abell 665" (PDF). The Astrophysical Journal. Chicago, Illinois, USA: The University of Chicago Press. 540 (2): 726–740. arXiv:astro-ph/0004263. Bibcode:2000ApJ...540..726G. doi:10.1086/309360. Retrieved March 16, 2012.
  3. ^ Oegerle, William R.; Fitchett, Michael J.; Hill, John M.; Hintzen, Paul (July 20, 1991). "Dynamics of the microwave-decrement cluster Abell 665" (PDF). Astrophysical Journal, Part 1. 376: 46–50. Bibcode:1991ApJ...376...46O. doi:10.1086/170254. ISSN 0004-637X. Retrieved March 16, 2012.
  4. ^ 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 12, 2012.
  5. ^ a b Bonamente, Massimiliano; Joy, Marshall K.; LaRoque, Samuel J.; Carlstrom, John E.; Reese, Erik D.; Dawson, Kyle S. (August 2006). "Determination of the Cosmic Distance Scale from Sunyaev-Zel'dovich Effect and Chandra X-Ray Measurements of High-Redshift Galaxy Clusters" (PDF). The Astrophysical Journal. Chicago, Illinois, USA: The University of Chicago Press. 647 (1): 25–54. arXiv:astro-ph/0512349. Bibcode:2006ApJ...647...25B. doi:10.1086/505291. Retrieved March 16, 2012.
  6. ^ "Abell's richest cluster". www.spacetelescope.org. Retrieved 30 October 2017.

Coordinates: Sky map 08h 30m 45.2s, +65° 52′ 55″