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 Template: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 Template: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 Template:Val, thus just over an arcminute.
Supernovae
Three supernovae have been observed in M84:
- SN 1957B ([[type_Ia_supernova|typeTemplate:NbspIa]], mag. 12.5) was discovered by H. S. Gates on 28 April 1957, and independently by Dr. G. 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 high rate of supernovae is rare for elliptical galaxies, which may indicate there is a population of stars of intermediate age in M84.[6]
See also
References and footnotes
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External links
Template:Portal bar Template:Virgo Template:Messier objects Template:Ngc45 Template:Sky
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- Pages with script errors
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- Elliptical galaxies
- Lenticular galaxies
- Virgo Cluster
- Virgo (constellation)
- Messier objects
- NGC objects
- UGC objects
- Principal Galaxies Catalogue objects
- Astronomical objects discovered in 1781
- Discoveries by Charles Messier
- Radio galaxies
- 3C objects
- 4C objects
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