Astronomy:NGC 6251
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Short description: Seyfert galaxy in the constellation Ursa Minor
| 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
- ↑ 1.0 1.1 1.2 1.3 "NASA/IPAC Extragalactic Database". Results for NGC 6251. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC++6251&extend=no.
- ↑ "Distance and Length". Online-Unit-Converter.com. http://www.online-unit-converter.com/distance-and-length/.
- ↑ 3.0 3.1 3.2 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. doi:10.1086/190931. Bibcode: 1984ApJS...54..291P.
- ↑ 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, doi:10.1071/AS08013, Bibcode: 2008PASA...25..167G.
External links
- 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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