NGC 6251

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. ↑ 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.
2. ↑ "Distance and Length". Online-Unit-Converter.com. http://www.online-unit-converter.com/distance-and-length/.
3. ↑ 3.0 3.1 3.2 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. doi:10.1086/190931. Bibcode: 1984ApJS...54..291P.
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, 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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New General Catalogue 6000 to 6499

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* 6251
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* Astronomical catalog
* List of NGC objects

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Constellation of Ursa Minor

* List of stars in Ursa Minor
* Ursa Minor in Chinese astronomy

Stars|

| Bayer|

* α (Polaris)
* β (Kochab)
* γ (Pherkad)
* δ (Yildun)
* ε
* ζ (Akhfa al Farkadain)
* η (Anwar al Farkadain)
* θ
* λ
* π1
* π2

|

Flamsteed|

* 3
* 4
* 5
* 6
* 8
* 9
* 10
* 11
* 12
* 14
* 17
* 19
* 20
* 24

Variable|

* R
* S
* T
* U
* V
* W
* Z
* RR
* RU
* RW
* SS
* UY
* VX

HR|

* 286
* 4683
* 4950
* 5073
* 5139
* 5184
* 5334
* 5479
* 5596
* 5629
* 5672
* 5691
* 5844
* 6034
* 6088
* 6173
* 6191
* 6238
* 6267
* 6529

HD|

* 150706

Other|

* Calvera
* H1504+65
* LP 40-365
* WD 1337+705
* WISE 1506+7027

Galaxies|

| NGC|

* 5034
* 5144
* 6217
* 6251

|

| Galaxy clusters|

* Abell 2256

|

Category

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Original source: https://en.wikipedia.org/wiki/NGC 6251. Read more

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