Messier 84

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Messier 84
Messier 84 nucleus by HST
M84. Credit:NOAO.
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension 12h 25m 03.74333s[1]
Declination+12° 53′ 13.1393″[1]
Redshift1,060±6 km/s[2]
Helio radial velocity999[3] km/s
Distance54.9 Mly (16.83 Mpc)[3]
Apparent magnitude (V)10.1[2]
Absolute magnitude (V)−22.41±0.10[4]
Characteristics
TypeE1[4]
Apparent size (V)6′.5 × 5′.6[2]
Half-light radius (apparent)72.5±6[4]
Other designations
M84, NGC 4374, PGC 40455, UGC 7494, VCC 763[5]

Messier 84 or M84, also known as NGC 4374, is an elliptical or lenticular galaxy in the constellation Virgo. Charles Messier discovered Messier 84 on 18 March 1781 in a systematic search for "nebulous objects" in the night sky.[6] The object is the 84th in the Messier Catalogue. M84 is situated in the heavily populated inner core of the Virgo Cluster of galaxies.[7]

This is a giant elliptical galaxy with a morphological classification of E1, indicating a flattening of 10%. The half-light radius is 72.5″ and the extinction-corrected total luminosity in the visual band is 7.64×1010 L. The central mass-to-light ratio is 6.5, which steadily increases away from the core. The visible galaxy is surrounded by a massive dark matter halo.[4]

Radio observations and Hubble Space Telescope images 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 indicating the presence of a 1.5 ×109 M[8] supermassive black hole. It also has a few young stars and star clusters, indicating star formation at a very low rate.[9] The number of globular clusters is 1,775±150, which is much lower than expected for an elliptical galaxy.[10]

Two supernovae have been observed in M84: SN 1957[11] and SN 1991bg.[12] Possibly, a third, SN 1980I is part of M84 or, alternatively, one of its neighboring galaxies, NGC 4387 and M86.[13] This high rate of supernova events is rare for elliptical galaxies, which may indicate there is a population of stars of intermediate age in M84.[10]

References[edit]

  1. ^ a b Lambert, S. B.; Gontier, A.-M. (January 2009). "On radio source selection to define a stable celestial frame". Astronomy and Astrophysics. 493 (1): 317–323. Bibcode:2009A&A...493..317L. doi:10.1051/0004-6361:200810582.
  2. ^ a b c "NASA/IPAC Extragalactic Database". Results for NGC 4374. Retrieved 2006-11-14.
  3. ^ a b Tully, R. Brent; et al. (August 2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 21. arXiv:1605.01765. Bibcode:2016AJ....152...50T. doi:10.3847/0004-6256/152/2/50. 50.
  4. ^ a b c d Napolitano, N. R.; et al. (March 2011). "The PN.S Elliptical Galaxy Survey: a standard ΛCDM halo around NGC 4374?". Monthly Notices of the Royal Astronomical Society. 411 (3): 2035–2053. arXiv:1010.1533. Bibcode:2011MNRAS.411.2035N. doi:10.1111/j.1365-2966.2010.17833.x.
  5. ^ "M 84". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-12-17.
  6. ^ Jones, K. G. (1991). Messier's Nebulae and Star Clusters (2nd ed.). Cambridge: Cambridge University Press. ISBN 978-0-521-37079-0.
  7. ^ Finoguenov, A.; Jones, C. (2002). "Chandra Observation of Low-Mass X-Ray Binaries in the Elliptical Galaxy M84". Astrophysical Journal. 574 (2): 754–761. arXiv:astro-ph/0204046. Bibcode:2002ApJ...574..754F. doi:10.1086/340997.
  8. ^ Bower, G.A.; et al. (1998). "Kinematics of the Nuclear Ionized Gas in the Radio Galaxy M84 (NGC 4374)". Astrophysical Journal. 492 (1): 111–114. arXiv:astro-ph/9710264. Bibcode:1998ApJ...492L.111B. doi:10.1086/311109.
  9. ^ Ford, Alyson; Bregman, J. N. (2012). "Detection of Ongoing, Low-Level Star Formation in Nearby Ellipticals". American Astronomical Society. 219: 102.03. Bibcode:2012AAS...21910203F.
  10. ^ a b Gómez, M.; Richtler, T. (February 2004). "The globular cluster system of NGC 4374". Astronomy and Astrophysics. 415 (2): 499–508. arXiv:1703.00313. Bibcode:2004A&A...415..499G. doi:10.1051/0004-6361:20034610.
  11. ^ Götz, W. (1958). "Supernova in NGC 4374 (= M 84)". Astronomische Nachrichten. 284 (3): 141–142. Bibcode:1958AN....284..141G. doi:10.1002/asna.19572840308.
  12. ^ Kosai, H.; et al. (1958). "Supernova 1991bg in NGC 4374". IAU Circular. 5400: 1. Bibcode:1991IAUC.5400....1K.
  13. ^ Smith, H. A. (1981). "The spectrum of the intergalactic supernova 1980I". Astronomical Journal. 86: 998–1002. Bibcode:1981AJ.....86..998S. doi:10.1086/112975.

External links[edit]

Coordinates: Sky map 12h 25m 03.7s, +12° 53′ 13″