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M81 Group

The M81 Group is a galaxy group in the constellations Ursa Major and Camelopardalis that includes the galaxies Messier 81 and Messier 82, as well as several other galaxies with high apparent brightnesses.[1] The approximate center of the group is located at a distance of 3.6 Mpc, making it one of the nearest groups to the Local Group.[1] The group is estimated to have a total mass of (1.03 ± 0.17)×1012M☉.[2]The M81 Group, the Local Group, and other nearby groups all lie within the Virgo Supercluster (i.e. the Local Supercluster).[3]

Members

The table below lists galaxies that have been identified as associated with the M81 Group by I. D. Karachentsev.[1]

Note that the object names used in the above table differ from the names used by Karachentsev. NGC, IC, UGC, and PGC numbers have been used in many cases to allow for easier referencing.

Interactions within the group

Messier 81, Messier 82, and NGC 3077 are all strongly interacting with each other.[5] Observations of the 21-centimeter hydrogen line indicate how the galaxies are connected.[6] The gravitational interactions have stripped some hydrogen gas away from all three galaxies, leading to the formation of filamentary gas structures within the group.[5] Bridges of neutral hydrogen have been shown to connect M81 with M82 and NGC 3077.[6][7] Moreover, the interactions have also caused some interstellar gas to fall into the centers of Messier 82 and NGC 3077, which has led to strong starburst activity (or the formation of many stars) within the centers of these two galaxies.[5] Computer simulations of tidal interactions have been used to show how the current structure of the group could have been created.[8]

Gallery

See also

References

  1. ^ a b c d e I. D. Karachentsev (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal. 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode:2005AJ....129..178K. doi:10.1086/426368. S2CID 119385141.
  2. ^ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6. S2CID 120973010.
  3. ^ R. B. Tully (1982). "The Local Supercluster". Astrophysical Journal. 257: 389–422. Bibcode:1982ApJ...257..389T. doi:10.1086/159999.
  4. ^ a b c d e "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2007-02-09.
  5. ^ a b c M. S. Yun; P. T. P. Ho; K. Y. Lo (1994). "A high-resolution image of atomic hydrogen in the M81 group of galaxies". Nature. 372 (6506): 530–532. Bibcode:1994Natur.372..530Y. doi:10.1038/372530a0. PMID 7990925. S2CID 4369085.
  6. ^ a b Chynoweth, Katie M.; et al. (2008). "Neutral Hydrogen Clouds in the M81/M82 Group". The Astronomical Journal. 135 (2008 June): 1983–1992. arXiv:0803.3631. Bibcode:2008AJ....135.1983C. doi:10.1088/0004-6256/135/6/1983. S2CID 4490764.
  7. ^ Hulst, J. M. van der (1978). "The Structure and Kinematics of the Neutral Hydrogen Bridge Between M 81 and NGC 3077". Astronomy and Astrophysics. 75 (1–2): 97–111.
  8. ^ Yun, M. S. (1999). "Tidal Interactions in M81 Group". Galaxy Interactions at Low and High Redshift, Proceedings of IAU Symposium. 186: 81. Bibcode:1999IAUS..186...81Y. doi:10.1007/978-94-011-4665-4_18. ISBN 978-0-7923-5833-6.
  9. ^ "The mysteries of UGC 8201". Retrieved 18 June 2015.

External links