Messier 84
From Wikipedia, the free encyclopedia
- This article is about the galaxy M84. For the Yugoslav tank, see M-84.
M84. Credit:NOAO. |
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| Observation data: J2000 epoch | |
|---|---|
| Constellation: | Virgo |
| Right ascension: | 12h 25m 03.7s[1] |
| Declination: | +12° 53′ 13″[1] |
| Redshift: | 1060 ± 6 km/s[1] |
| Distance: | 60 ± 3 Mly (18.4 ± 0.9 Mpc)[2] |
| Type: | E1[1] |
| Apparent dimensions (V): | 6′.5 × 5′.6[1] |
| Apparent magnitude (V): | 10.1[1] |
| Notable features: | - |
| Other designations | |
| NGC 4374,[1] UGC 7494,[1] PGC 40455,[1] VCC 763[1] |
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| See also: Galaxy, List of galaxies | |
Messier 84 (also known as M84 or NGC 4374) is a lenticular galaxy in the constellation Virgo. M84 is situated in the heavily populated inner core of the Virgo Cluster of galaxies.[3]
Radio observations and images of the Hubble Space Telescope of M84 have revealed two jets of matter shooting out from the galaxy's center as well as a disk of rapidly rotating gas and stars close to the nucleus indicating the presence of a supermassive black hole of 18 ×108 M☉[4] in the galaxy's nucleus.
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[edit] History
Charles Messier discovered Messier 84 on 18 March 1781 in a systematic search for "nebulous objects" in the night sky[5]. The object is the 84th in the Messier Catalogue.
[edit] Supernovae
Two supernovae have been observed in M84: SN 1957[6] and SN 1991bg.[7] Possibly, a third, SN 1980I is part of M84 or, alternatively, one of its neighboring galaxies, NGC 4387 and M86.[8]
[edit] External links
[edit] References
- ^ a b c d e f g h i j NASA/IPAC Extragalactic Database. Results for NGC 4374. Retrieved on 2006-11-14.
- ^ J. L. Tonry, A. Dressler, J. P. Blakeslee, E. A. Ajhar, A. B. Fletcher, G. A. Luppino, M. R. Metzger, C. B. Moore (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal 546 (2): 681-693.
- ^ Finoguenov, A.; Jones, C. (2002). "Chandra Observation of Low-Mass X-Ray Binaries in the Elliptical Galaxy M84". The Astrophysical Journal 574 (2): 754-761.
- ^ Ly, C.; Walker, R. C.; Wrobel, J. M. (2004). "An Attempt to Probe the Radio Jet Collimation Regions in NGC 4278, NGC 4374 (M84), and NGC 6166". The Astronomical Journal 127 (1): 119-124.
- ^ K. G. Jones (1991). Messier's Nebulae and Star Clusters, 2nd edition, Cambridge: Cambridge University Press. ISBN 0-521-37079-5.
- ^ Götz, W. (1958). "Supernova in NGC 4374 (= M 84)". Astronomische Nachrichten 284: 141.
- ^ Kosai, H.; Kushida, R.; Kato, T.; Filippenko, A.; Newberg, H. (1958). "Supernova 1991bg in NGC 4374". IAU Circ. 5400: 1.
- ^ Smith, H. A. (July 1981). "The spectrum of the intergalactic supernova 1980I". Astronomical Journal 86: 998-1002.
