Messier Index/M84

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Messier 84
M84. Credit:w:NOAO.
Observation data (w: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]

Messier 84 (also known as M84 or NGC 4374) is a w:lenticular galaxy in the w:constellation Virgo. M84 is situated in the heavily populated inner core of the Virgo Cluster of galaxies.[3]

Radio observations and images of the w: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 w:black hole of 18 ×108 M[4] in the galaxy's nucleus.

Messier 84 nucleus by HST


w: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 w:Messier Catalogue.


Two w:supernovae have been observed in M84: w:SN 1957[6] and w:SN 1991bg.[7] Possibly, a third, w:SN 1980I is part of M84 or, alternatively, one of its neighboring galaxies, w:NGC 4387 and M86.[8]

External links


  1. a b c d e f g h i j "NASA/IPAC Extragalactic Database". Results for NGC 4374. Retrieved 2006-11-14. 
  2. 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. doi:10.1086/318301. 
  3. 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. doi:10.1086/340997. 
  4. 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. doi:10.1086/379855. 
  5. K. G. Jones (1991). Messier's Nebulae and Star Clusters (2nd ed.). Cambridge: Cambridge University Press. ISBN 0-521-37079-5. 
  6. Götz, W. (1958). "Supernova in NGC 4374 (= M 84)". Astronomische Nachrichten 284: 141. doi:10.1002/asna.19572840308. 
  7. Kosai, H.; Kushida, R.; Kato, T.; Filippenko, A.; Newberg, H. (1958). "Supernova 1991bg in NGC 4374". IAU Circ. 5400: 1. 
  8. Smith, H. A. (July 1981). "The spectrum of the intergalactic supernova 1980I". Astronomical Journal 86: 998–1002. doi:10.1086/112975.