NGC 6251

Seyfert galaxy in the constellation Ursa Minor
NGC 6251
Hubble image of the heart of the active galaxy NGC 6251
Observation data (J2000 epoch)
ConstellationUrsa Minor
Right ascension16h 32m 31.9700s[1]
Declination+82° 32′ 16.400″[1]
Redshift0.02471[1]
Distance340 million light-years[2]
Apparent magnitude (V)14.3[3]
Characteristics
TypeE[1]
Apparent size (V)1.82´X1.55´
Other designations
NGC 6251, UGC 10501, LEDA 58472, 6C 1636+8239, QSO B1637+826

NGC 6251 is an active supergiant elliptical radio galaxy in the constellation Ursa Minor, and is more than 340 million light-years away from Earth. The galaxy has a Seyfert 2 active galactic nucleus,[3] and is one of the most extreme examples of a Seyfert galaxy. This galaxy may be associated with gamma-ray source 3EG J1621+8203, which has high-energy gamma-ray emission.[3] It is also noted for its one-sided radio jet—one of the brightest known—discovered in 1977.[4] The supermassive black hole at the core has a mass of (5.9±2.0)×108 M☉.[5]

References

  1. ^ a b c d "NASA/IPAC Extragalactic Database". Results for NGC 6251. Retrieved 2006-10-26.
  2. ^ "Distance and Length". Online-Unit-Converter.com. Archived from the original on 2010-03-30. Retrieved 2010-03-29.
  3. ^ a b c SIMBAD
  4. ^ Perley, R. A.; Bridle, A. H.; Willis, A. G. (1984). "High-resolution VLA Observations of the Radio Jet in NGC 6251". Astrophysical Journal Supplement Series. 54: 291–334. Bibcode:1984ApJS...54..291P. doi:10.1086/190931.
  5. ^ Graham, Alister W. (November 2008), "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values", Publications of the Astronomical Society of Australia, 25 (4): 167–175, arXiv:0807.2549, Bibcode:2008PASA...25..167G, doi:10.1071/AS08013, S2CID 89905.

External links

  • Media related to NGC 6251 at Wikimedia Commons
  • www.jb.man.ac.uk/atlas/
  • Wikisky image of NGC 6251
  • Hubble Finds a Bare Black Hole Pouring Out Light (Probing the heart of the active galaxy NGC 6251—September 10, 1997)
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