Messier 84

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Messier 84 or M84, also known as NGC 4374, is a giant elliptical or lenticular galaxy in the constellation Virgo. Charles Messier discovered the object in 1781Template:Efn in a systematic search for "nebulous objects" in the night sky.[1] It is the 84th object in the Messier Catalogue and in the heavily populated core of the Virgo Cluster of galaxies, part of the local supercluster.[2]

This galaxy has morphological classification E1, denoting it has flattening of about 10%. The extinction-corrected total luminosity in the visual band is about Script error: No such module "val".. The central mass-to-light ratio is 6.5, which, to a limit, steadily increases away from the core. The visible galaxy is surrounded by a massive dark matter halo.[3]

Radio observations and Hubble Space Telescope images of M84 have revealed two jets of matter shooting out from its center as well as a disk of rapidly rotating gas and stars indicating the presence of a Template:Solar mass[4] supermassive black hole. It also has a few young stars and star clusters, indicating star formation at a very low rate.[5] The number of globular clusters is Script error: No such module "val"., which is much lower than expected for an elliptical galaxy.[6]

Viewed from Earth its half-light radius, relative angular size of its 50% peak of lit zone of the sky, is Script error: No such module "val"., thus just over an arcminute.

Supernovae

Three supernovae have been observed in M84:

  • SN 1957B (TypeScript error: No such module "String".Ia, mag. 12.5) was discovered by Howard S. Gates on 28 April 1957, and independently by Dr. Giuliano Romano on 18 May 1957.[7][8][9]
  • SN 1980I (Type Ia, mag. 14) was discovered by M. Rosker on 13 June 1980.[10][11] Historically, this supernova has been catalogued as belonging to M84, but it may have been in either neighboring galaxy NGC 4387 or M86.[12]
  • SN 1991bg (Type Ia-pec, mag. 14) was discovered by Reiki Kushida on 3 December 1991.[13][14] This supernova has been studied extensively as a peculiar and underluminous Type Ia, and is now used as a template, with similar events being classified as Type Ia-91bg-like.[15]

This high rate of supernovae is rare for elliptical galaxies, which may indicate there is a population of stars of intermediate age in M84.[6]

File:M84map.png
Location of M84

See also

References and footnotes

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  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".

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External links

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