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NGC 4861, also known as Arp 266, is a galaxy in the constellation Canes Venatici. It was discovered by William Herschel on May 1, 1785.[4]

NGC 4861
Hubble Space Telescope image of NGC 4861, taken using the Advanced Camera for Surveys
Observation data (J2000 epoch)
ConstellationCanes Venatici
Right ascension12h 59m 02.340s[1]
Declination+34° 51′ 33.98″[1]
Redshift0.002785[2]
Helio radial velocity835[2]
Distance34.77 ± 15.99 Mly (10.662 ± 4.903 Mpc)[2]
Group or clusterVirgo Cluster
Apparent magnitude (V)12.32
Apparent magnitude (B)12.90
Characteristics
TypeSB(s)m[2]
Im/BCD
Apparent size (V)0.797′ × 0.692′[1]
Other designations
Arp 266, UGC 8098, MCG+06-29-003, PGC 44536[3]

Morphological classification of NGC 4861 has proved relatively difficult. Its mass, size, and rotational velocity are consistent with it being a spiral galaxy. However, due to its highly irregular shape, it may also be classified as a dwarf irregular galaxy.[5] In fact, since dwarf galaxies are less massive and have lower gravitational potentials, gases and other material for star formation can move within them much faster, causing the galaxy to become a specific type of starburst galaxy, called a blue compact dwarf galaxy.[5][3] It has also been described as a "comet-like" galaxy due to its resemblance to a comet.[6]

Two ultraluminous X-ray sources (ULXs) have been found within NGC 4861. The first, NGC 4861 X1, is associated with a dense H II region. The second, NGC 4861 X2, seems to be within a small star cluster near the "comet head" of NGC 4861. Assuming it is a star cluster, it has a mass of 400±80 M☉ and an age of 5 million years. Compared to other star clusters with which ULXs are associated, its mass is quite low.[6]


See also



References


  1. Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131: 1163–1183. doi:10.1086/498708. ISSN 0004-6256.
  2. "NED results for object NGC 4861". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 4 February 2017.
  3. "NGC 4861". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 February 2017.
  4. Courtney Seligman. "New General Catalog Objects: NGC 4500 - 4599". Retrieved 4 February 2017.
  5. "Starbirth with a chance of winds?". www.spacetelescope.org. Retrieved 4 February 2017.
  6. Ela, M Ozdogan; Akyuz, A.; Aksaker, N.; Avdan, S.; Oralhan, I Akkaya; Vinokurov, A.; Allak, S.; Solovyeva, Y.; Atapin, K.; Bizyaev, D. (2021). "Optical counterparts of ULXs in two dwarf galaxies: NGC 4861 and NGC 4449". Monthly Notices of the Royal Astronomical Society. 505: 771–782. arXiv:2105.02302. doi:10.1093/mnras/stab1321.



На других языках

[de] NGC 4861

NGC 4861 = IC 3961= Arp 266 ist eine Balkenspiralgalaxie vom Hubble-Typ SB(s)m: im Sternbild Jagdhunde am Nordsternhimmel, welche etwa 39 Millionen Lichtjahre von der Milchstraße entfernt ist. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Galaxien mit unregelmäßigen Klumpen.
- [en] NGC 4861

[ru] NGC 4861

NGC 4861 (другие обозначения — IC 3961, MK 59, UGC 8098, 1ZW 49, MCG 6-29-3, ARP 266, ZWG 189.5, KUG 1256+351, VV 797, KCPG 362A, PGC 44536) — галактика в созвездии Гончие Псы.


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