| NGC 6251 | |
|---|---|
 Hubble image of the heart of the
active galaxy NGC 6251 | |
| Observation data ( J2000 epoch) | |
| Constellation | Ursa Minor |
| Right ascension | 16h 32m 31.9700s [1] |
| Declination | +82° 32′ 16.400″ [1] |
| Redshift | 0.02471 [1] |
| Distance | 340 million light-years [2] |
| Apparent magnitude (V) | 14.3 [3] |
| Characteristics | |
| Type | E [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
- ^ a b c d "NASA/IPAC Extragalactic Database". Results for NGC 6251. Retrieved 2006-10-26.
- ^ "Distance and Length". Online-Unit-Converter.com. Archived from the original on 2010-03-30. Retrieved 2010-03-29.
- ^ a b c SIMBAD
- ^ 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.
- ^ 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
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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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