Astronomy:Messier 85

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Short description: Elliptical galaxy in the constellation Coma Berenices
Messier 85
Messier85 - HST - Potw1905a.jpg
Galaxy Messier 85 by Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationComa Berenices
Right ascension 12h 25m 24.0s[1]
Declination+18° 11′ 28″[1]
Redshift729 ± 2 km/s[1]
Distance60 ± 4 Mly (18.5 ± 1.2 Mpc)[2]
Apparent magnitude (V)9.1[3]
Characteristics
TypeSA(s)0+ pec[1]/E2[4]
Apparent size (V)7′.1 × 5′.5[1]
Other designations
NGC 4382, UGC 7508, PGC 40515[1]

Messier 85 (also known as M85 or NGC 4382 or PGC 40515 or ISD 0135852) is a lenticular galaxy, or elliptical galaxy for other authors,[4] in the Coma Berenices constellation. It is 60 million light-years away, and it is estimated to be 125,000 light-years across.

Pierre Méchain discovered M85 in 1781. It is within the outskirts of the Virgo cluster, and is relatively isolated.[5]

Properties

M85 is extremely poor in neutral hydrogen[6] and has a very complex outer structure with shells and ripples that are thought to have been caused by a merger with another galaxy that took place between 4 and 7 billion years ago,[6] as well as a relatively young (<3 billion years old) stellar population on its centermost region, some of it in a ring, that may have been created by a late starburst.[7] Like other massive, early-type galaxies, it has different populations of globular clusters. Aside from the typical "red" and "blue" populations, there is also a population with intermediate colors and an even redder population.[5] It is likely transitioning from being a lenticular galaxy into an elliptical galaxy.[5]

While indirect methods imply that Messier 85 should contain a central supermassive black hole of around 100 million solar masses,[8] velocity dispersion observations imply that the galaxy may entirely lack a central massive black hole.[9]

M85 is interacting with the nearby spiral galaxy NGC 4394, and a small elliptical galaxy called MCG 3-32-38.[10]

Compared to other early-type galaxies, M85 emits a relatively smaller proportion of X-rays.[5]

Novae and Supernovae

The type I supernova, SN 1960R was discovered in M85 on December 20, 1960 and reached an apparent magnitude of 11.7 (its effect in the telescope-resolvable sky to outshine most red dwarves a million times closer).

This galaxy has also been the host of the first luminous red nova identified as such, M85 OT2006-1. It was discovered on January 7 of 2006 and took place on the outskirts of this galaxy.[11]

On 25 June 2020, the ATLAS telescope in Hawaii spotted type Ia supernova SN 2020nlb in M85, which reached a peak magnitude of 12.0. [12] [13] [14]

Location of M85

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "NASA/IPAC Extragalactic Database". Results for Messier 85. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=M+85&extend=yes&out_equinox=J2000.0. 
  2. ↑ J. L. Tonry; A.Dressler; J. P. Blakeslee; E. A. Ajhar et al. (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal 546 (2): 681–693. doi:10.1086/318301. Bibcode: 2001ApJ...546..681T. 
  3. ↑ "Messier 85". https://messier.seds.org/m/m085.html. 
  4. ↑ 4.0 4.1 Kormendy, John; Fisher, David B.; Cornell, Mark E.; Bender, Ralf (2009). "Structure and Formation of Elliptical and Spheroidal Galaxies". Astrophysical Journal Supplement 182 (1): 216–309. doi:10.1088/0067-0049/182/1/216. Bibcode: 2009ApJS..182..216K. 
  5. ↑ 5.0 5.1 5.2 5.3 Escudero, Carlos G.; Cortesi, Arianna; Faifer, Favio R.; Sesto, Leandro A.; Smith Castelli, Analía V.; Johnston, Evelyn J.; Reynaldi, Victoria; Chies-Santos, Ana L. et al. (2022). "The complex globular cluster system of the S0 galaxy NGC 4382 in the outskirts of the Virgo Cluster". Monthly Notices of the Royal Astronomical Society 511 (1): 393–412. doi:10.1093/mnras/stac021. Bibcode: 2022MNRAS.511..393E. 
  6. ↑ 6.0 6.1 Hibbard, J. E.; Sansom, A. E. (2003). "A Search for H I in Five Elliptical Galaxies with Fine Structure". The Astronomical Journal 125 (2): 667–683. doi:10.1086/345822. Bibcode: 2003AJ....125..667H. 
  7. ↑ Fisher, David; Franx, Marijn; Illingworth, Garth (1996). "Line Strengths and Line-Strength Gradients in S0 Galaxies". Astrophysical Journal 459 (1): 110. doi:10.1086/176873. Bibcode: 1996ApJ...459..110F. 
  8. ↑ Kormendy, John; Bender, Ralf (2009). "Correlations between Supermassive Black Holes, Velocity Dispersions, and Mass Deficits in Elliptical Galaxies with Cores". Astrophysical Journal Letters 691 (2): L142–L146. doi:10.1088/0004-637X/691/2/L142. Bibcode: 2009ApJ...691L.142K. 
  9. ↑ Gultekin, Kayhan; Richstone, Douglas O. et al. (2011). "Is There a Black Hole in NGC 4382?". Astrophysical Journal 741 (1): L142–L146. doi:10.1088/0004-637X/741/1/38. Bibcode: 2011ApJ...741...38G. 
  10. ↑ "M85, Lenticular Galaxy". Messier's Nebulae and Star Clusters. http://www.kopernik.org/images/archive/m85.htm. 
  11. ↑ Kulkarni, S. R.; Ofek, E. O.; Rau, A.; Cenko, S. B. et al. (2007). "An unusually brilliant transient in the galaxy M85". Nature 447 (7143): 458–460. doi:10.1038/nature05822. PMID 17522679. Bibcode: 2007Natur.447..458K. 
  12. ↑ "AstroNote 2020-126". ATLAS20qoq (AT2020nlb): discovery of a candidate SN in MESSIER 85 (17 Mpc). https://wis-tns.weizmann.ac.il/astronotes/astronote/2020-126. 
  13. ↑ "Messier 85". SEDS: Galaxy M85. http://messier.seds.org/m/m85.html. 
  14. ↑ "SN 2020nlb". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=SN+2020nlb. 

External links

Coordinates: Sky map 12h 25m 24s, +18° 11′ 28″



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