NGC 3862

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NGC 3862
NGC3862 - SDSS DR14.png
SDSS image of NGC 3862. The small galaxy at the top of the image is IC 2955.
Observation data (J2000 epoch)
Right ascension 11h 45m 05.0s[1]
Declination19° 36′ 23″[1]
Redshift0.021718 ± 0.000019[1]
Helio radial velocity6511 ± 6 km/s[1]
Distance304 Mly (93.3 Mpc)
Group or clusterLeo Cluster
Apparent magnitude (V)13.67[1]
Size~152,000 ly (46.6 kpc) (estimated)[1]
Apparent size (V)1.5 x 1.5[1]
Notable featurescontains a supermassive black hole powering a jet of plasma that is moving at 98 percent of the speed of light
Other designations
UGC 06723, PGC 036606, MCG +03-30-095, CGCG 097-127, 3C 264, 4C +19.40, PKS 1142+19[1]
See also: Galaxy, List of galaxies

NGC 3862 is an elliptical galaxy located 300 million light-years away[2] in the constellation Leo.[3] Discovered by astronomer William Herschel on April 27, 1785,[4] NGC 3862 is an outlying member of the Leo Cluster.[5]

The galaxy is classified as a FR I radio galaxy[6] and as a Head-tail radio galaxy.[7] It hosts a supermassive black hole that is blasting a jet of plasma that is moving at 98 percent of the speed of light and is one of the few jets that can be seen in visible light.[8]


Observations made by Bridle et al. in 1981 using maps made with the VLA revealed a jet-like structure emerging from the nucleus of NGC 3862.[7] In late January 1992, the HST observed NGC 3862 with the Faint Object Spectrograph confirmed the presence of an optical jet in nucleus of NGC 3862.[9][3]

The optical jet which has a measured length of 2,800 ly (860 pc), appears to expand slowly and dims in peak and integrated brightness within the interior to the apparent ring of dust.[10] Within distances of about 260–360 ly (80–110 pc), the appears narrow and well-collimated.[11][12] At a distance of 330 ly (100 pc) the jet starts to abruptly expand and becomes turbulent. At this distance, filaments and pronounced kinks can be observed which suggests that the jet is oscillating or evolving a helical structure.[12] After crossing the ring at a distance of around 980–1,300 ly (300–400 pc), the jet widens dramatically, changes direction, and dims more rapidly both in peak and integrated brightness and becomes more diffuse in appearance. This suggests that the jet is interacting with the dust ring and becomes less collimated.[10] However, Perlman et al. suggsts that the disk and the jet occupy physically distinct regions of the galaxy and therefore not interacting.[13]


The central region of NGC 3862 appears host a nearly face-on disk of dust[14][15][10][16] with a diameter of 2,200 ly (675 pc).[17] However as the jet of galaxy has been suggested to lie at angle of 50°[13][10] to Earth's line of sight, the dust disk must be ''puffed up''[10][14] in order of the jet to have been disturbed by the disk.[10] The emission of CO in the nucleus exhibits a double-horned line profile which suggests that the dust disk is rotating. The inferred distribution of the CO is consistent with the observed dust disk and the presence of the molecular gas suggests that the gas originated from ether a merger with two gas-rich galaxies a few billion years ago or from cannibalism of smaller gas-rich galaxies.[18]

Hutchings et al. proposed instead that the apparent disk represents an evacuated region cleared of dust by some nuclear related process or by the jet itself[19][14] as indicated by the color of the region inside the ring being similar to the color of the galaxy spectrum.[19] Lara et al. also suggested this as the jet appears to widen within the apparent ring which would be consistent with an explanation of a favored expansion of the jet due to the lower density medium within the evacuated region or bubble.[11]

Supermassive black hole[edit]

NGC 3862 contains a supermassive black hole with an estimated mass of 4.7×108 M☉.[20]

The black hole is responsible for producing the jet of plasma that is moving at nearly the speed of light.[8]

Companion galaxies[edit]

NGC 3862 has an elliptical[21] or a lenticular companion galaxy known as IC 2955. It lies about 72,000 ly (22 kpc) from NGC 3862.[15]

See also[edit]


  1. ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for NGC 3862. Retrieved 2018-09-03.
  2. ^ "Your NED Search Results". Retrieved 2018-09-03.
  3. ^ a b "High Energy Jet in Galaxy NGC 3862". ESA. 7 May 1992. Retrieved 26 August 2018.
  4. ^ "New General Catalog Objects: NGC 3850 - 3899". Retrieved 2018-09-03.
  5. ^ Northover, K. J. E. (1976-11-01). "Observations of the Radio Galaxies 3C 264 and 3C 315". Monthly Notices of the Royal Astronomical Society. 177 (2): 307–317. Bibcode:1976MNRAS.177..307N. doi:10.1093/mnras/177.2.307. ISSN 0035-8711.
  6. ^ "3CRR Atlas:3C 264: Main Page". Retrieved 2018-09-04.
  7. ^ a b Bridle, A. H.; Vallee, J. P. (August 1981). "High-resolution radio observations of the X-ray galaxy NGC 3862 /3C 264/ in Abell 1367". The Astronomical Journal. 86: 1165–1174. doi:10.1086/112995.
  8. ^ a b "HubbleSite: News - Hubble Video Shows Shock Collision Inside Black Hole Jet". Retrieved 2018-09-04.
  9. ^ Crane, P.; Peletier, R.; Baxter, D.; Sparks, W. B.; Albrecht, R.; Barbieri, C.; Blades, J. C.; Boksenberg, A.; Deharveng, J. M. (January 1993). "Discovery of an optical synchrotron jet in 3C 264". The Astrophysical Journal. 402: L37–L40. Bibcode:1993ApJ...402L..37C. doi:10.1086/186694. ISSN 0004-637X.
  10. ^ a b c d e f Baum, Stefi A.; O'Dea, Christopher P.; Giovannini, Gabriele; Cotton, William B.; Koff, Sigrid de; Luigina Feretti; Golombek, Daniel; Lara, Lucas; Macchetto, Ferdinando D. (1997). "HST and Merlin Observations of 3C 264—A Laboratory for Jet Physics and Unified Schemes". The Astrophysical Journal. 483 (1): 178. Bibcode:1997ApJ...483..178B. doi:10.1086/304221. ISSN 0004-637X.
  11. ^ a b Lara, L.; Giovannini, G.; Cotton, W. D.; Feretti, L.; Venturi, T. (2004-02-13). "The inner kiloparsec of the jet in 3C 264". Astronomy & Astrophysics. 415 (3): 905–913. arXiv:astro-ph/0311077. Bibcode:2004A&A...415..905L. doi:10.1051/0004-6361:20034317. ISSN 0004-6361.
  12. ^ a b Lara, L.; Feretti, L.; Giovannini, G.; Baum, S.; Cotton, W. D.; O’Dea, C. P.; Venturi, T. (March 1, 1999). "The Radio‐Optical Jet in NGC 3862 from Parsec to Subkiloparsec Scales". The Astrophysical Journal. 513 (1): 197–206. arXiv:astro-ph/9810495. Bibcode:1999ApJ...513..197L. doi:10.1086/306852. ISSN 0004-637X.
  13. ^ a b Perlman, E. S.; Padgett, C. A.; Georganopoulos, M.; Worrall, D. M.; Kastner, J. H.; Franz, G.; Birkinshaw, M.; F. Dulwich; O'Dea, C. P. (2010). "A Multi-Wavelength Spectral and Polarimetric Study of the Jet of 3C 264". The Astrophysical Journal. 708 (1): 171–187. arXiv:0911.1817. Bibcode:2010ApJ...708..171P. doi:10.1088/0004-637X/708/1/171. ISSN 0004-637X.
  14. ^ a b c Martel, André R.; Turner, Neal J.; Sparks, William B.; Baum, Stefi A. (2000). "Nuclear Gas and Dust Disks in Nearby 3CR Elliptical Galaxies". The Astrophysical Journal Supplement Series. 130 (2): 267. Bibcode:2000ApJS..130..267M. doi:10.1086/317356. ISSN 0067-0049.
  15. ^ a b Kleijn, Gijs A. Verdoes; Baum, Stefi A.; Zeeuw, P. Tim de; O'Dea, Chris P. (1999). "Hubble Space Telescope Observations of Nearby Radio-Loud Early-Type Galaxies". The Astronomical Journal. 118 (6): 2592. arXiv:astro-ph/9909256. Bibcode:1999AJ....118.2592V. doi:10.1086/301135. ISSN 1538-3881.
  16. ^ Quillen, A. C.; Almog, Jessica; Yukita, Mihoko (2003). "870 Micron Observations of Nearby 3CRR Radio Galaxies". The Astronomical Journal. 126 (6): 2677. arXiv:astro-ph/0308306. Bibcode:2003AJ....126.2677Q. doi:10.1086/379562. ISSN 1538-3881.
  17. ^ van Bemmel, I. M.; Morganti, R.; Oosterloo, T.; van Moorsel, G. (2012-11-29). "A relation between circumnuclear H I, dust, and optical cores in low-power radio galaxies". Astronomy & Astrophysics. 548: A93. arXiv:1211.0859. Bibcode:2012A&A...548A..93V. doi:10.1051/0004-6361/201219179. ISSN 0004-6361.
  18. ^ Lim, Jeremy; Leon, Stephane; Combes, Françoise; Dinh-V-Trung (2000). "Molecular Gas in the Powerful Radio Galaxies 3C 31 and 3C 264: Major or Minor Mergers?". The Astrophysical Journal Letters. 545 (2): L93. arXiv:astro-ph/0011520. Bibcode:2000ApJ...545L..93L. doi:10.1086/317885. ISSN 1538-4357.
  19. ^ a b Hutchings, J. B.; Baum, S. A.; Weistrop, D.; Nelson, C.; Kaiser, M. E.; Gelderman, R. F. (1998). "Spatially Resolved Spectra of 3C Galaxy Nuclei". The Astronomical Journal. 116 (2): 634. arXiv:astro-ph/9805177. Bibcode:1998AJ....116..634H. doi:10.1086/300474. ISSN 1538-3881.
  20. ^ Le, Truong; Newman, William; Edge, Brinkley (2018-03-10). "Jet launching radius in low-power radio-loud AGNs in advection-dominated accretion flows". Monthly Notices of the Royal Astronomical Society. 477 (2): 1803–1813. arXiv:1803.03860. Bibcode:2018MNRAS.477.1803L. doi:10.1093/mnras/sty644. ISSN 0035-8711.
  21. ^ "Your NED Search Results". Retrieved 2018-10-12.

External links[edit]