NGC 3585

NGC 3585 is an elliptical or a lenticular galaxy located in the constellation Hydra. It is located at a distance of circa 60 million light-years from Earth, which, given its apparent dimensions, means that NGC 3585 is about 80,000 light years across. It was discovered by William Herschel on December 9, 1784.[3]

NGC 3585
NGC 3585 by PanSTARRS
Observation data (J2000 epoch)
ConstellationHydra
Right ascension11h 13m 17.1s[1]
Declination−26° 45′ 17″[1]
Redshift0.004783 ± 0.000040 [1]
Heliocentric radial velocity1,434 ± 12 km/s[1]
Distance56 ± 15 Mly (17.3 ± 4.5 Mpc)[1]
Apparent magnitude (V)9.9 [2]
Characteristics
TypeE7/S0 [1]
Apparent size (V)4.7′ × 2.6′
Other designations
ESO 502- G 025, AM 1110-262, MCG -04-27-004, PGC 34160[1]

NGC 3585 features a red discy region in the core with a semi-major axis of circa 45 arcseconds, probably associated with diffuse dust. There are nearly 130 globular cluster candidates in the galaxy, with the total number of globular clusters estimated to be nearly 550. This number is quite low, but it is typical for field elliptical galaxies. Based on luminosity turnover of the globular clusters, it is suspected that there is a subpopulation of younger clusters.[4] The outer isophotes of the galaxy are asymmetrical, maybe due to a tidal disruption.[5]

In the centre of NGC 3585 lies a supermassive black hole whose mass is estimated to be 108.4 M☉ based on the tidal disruption rate[6] or 108.53 ± 0.122 M☉ based on the observation of the circumnuclear ring with very-long-baseline interferometry.[7] Based on observations by the Hubble Space Telescope to determine the stellar velocity dispersion at the core, the mass of the hole was estimated to be between 280 and 490 million M☉ by using the M–sigma relation.[8]

NGC 3585 is the most prominent member of a loose galaxy group known as the NGC 3585 group. Other members of the group are the spiral galaxies UGCA 226, ESO 502- G 016, and UGCA 230.[9][10]

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 3585. Retrieved 2016-01-18.
  2. "Revised NGC Data for NGC 3585". spider.seds.org. Retrieved 25 November 2018.
  3. Seligman, Courtney. "NGC 3585". Celestial Atlas. Retrieved 19 November 2018.
  4. Lane, R. R.; Salinas, R.; Richtler, T. (16 January 2013). "Isolated ellipticals and their globular cluster systems". Astronomy & Astrophysics. 549: A148. arXiv:1212.1451. doi:10.1051/0004-6361/201220231. S2CID 118433690.
  5. Tal, Tomer; van Dokkum, Pieter G.; Nelan, Jenica; Bezanson, Rachel (1 November 2009). "The Frequence of Tidal Features Associated with Nearby Luminous Elliptical Galaxies from a Statistically Complete Sample". The Astronomical Journal. 138 (5): 1417–1427. arXiv:0908.1382. Bibcode:2009AJ....138.1417T. doi:10.1088/0004-6256/138/5/1417. S2CID 19104100.
  6. Stone, Nicholas C.; Metzger, Brian D. (1 January 2016). "Rates of stellar tidal disruption as probes of the supermassive black hole mass function". Monthly Notices of the Royal Astronomical Society. 455 (1): 859–883. arXiv:1410.7772. Bibcode:2016MNRAS.455..859S. doi:10.1093/mnras/stv2281.
  7. Johannsen, Tim; Psaltis, Dimitrios; Gillessen, Stefan; Marrone, Daniel P.; Özel, Feryal; Doeleman, Sheperd S.; Fish, Vincent L. (10 October 2012). "Masses of Nearby Supermassive Black Holes with Very Long Baseline Interferometry". The Astrophysical Journal. 758 (1): 30. arXiv:1201.0758. Bibcode:2012ApJ...758...30J. doi:10.1088/0004-637X/758/1/30. S2CID 1129745.
  8. Gültekin, Kayhan; Richstone, Douglas O.; Gebhardt, Karl; Lauer, Tod R.; Pinkney, Jason; Aller, M. C.; Bender, Ralf; Dressler, Alan; Faber, S. M.; Filippenko, Alexei V.; Green, Richard; Ho, Luis C.; Kormendy, John; Siopis, Christos (20 April 2009). "A Quintet of Black Hole Mass Determinations". The Astrophysical Journal. 695 (2): 1577–1590. arXiv:0901.4162. Bibcode:2009ApJ...695.1577G. doi:10.1088/0004-637X/695/2/1577. S2CID 14365610.
  9. Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025. Archived from the original on 31 January 2016. Retrieved 3 January 2019.
  10. Garcia, A. M. (1993). "General study of group membership. II – Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100 (1): 47–90. Bibcode:1993A&AS..100...47G. ISSN 0365-0138.


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