NGC 7793
| NGC 7793 | |
|---|---|
J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 23h 57m 49.753s[1] |
| Declination | −32° 35′ 27.71″[1] |
| Heliocentric radial velocity | 227 km/s[2] |
| Distance | 12.2 Mly (3.7 Mpc)[3] |
| Group or cluster | Sculptor Group[4] |
| Apparent magnitude (V) | 10.0[5] |
| Characteristics | |
| Type | SA(s)d[6] |
| Mass | Stellar: 3.2×109 M☉ |
| Apparent size (V) | 9.3′ × 6.3′[5] (~30kly in diameter) |
| Other designations | |
| NGC 7793, PGC 73049[7] | |
NGC 7793 is a
light years and is receding with a heliocentric radial velocity of 227 km/s.[2] NGC 7793 is one of the five brightest galaxies within the Sculptor Group.[5][4]
The
angular size of 9.3′ × 6.3′[5] and a major axis aligned along a position angle of 99.3°.[6] There are two nearby dwarf galaxy companions.[9]
On March 25, 2008, a
red supergiant
, observed only 547 days prior to the explosion.
Jets from a black hole named P13 power a large nebula designated S26 in the outer spiral of this galaxy. Recently, the mass of P13 was determined to be less than 15 solar masses, and its companion star is estimated to be around 20 solar masses. The two orbit each other in 64 days.[12] Based on this estimate, P13 is stripping material away from a nearby star about ten times faster than was previously believed to be physically possible. If correct, this observation would show flaws in theories that a black hole's mass and rate of consumption are a fixed relationship.[13][14]
Gallery
-
Visual and infrared image of NGC 7793
See also
References
- ^ .
- ^ S2CID 250737862.
- ^ S2CID 174801441. A38.
- ^ S2CID 54977869.
- ^ ISBN 9781108103091.
- ^ .
- ^ "NASA/IPAC Extragalactic Database". Results for NGC 7793. Retrieved 2006-11-21.
- JSTOR 107841.
- S2CID 231718940. 203.
- ^ David Bishop. "Supernova 2008bk in NGC 7793". supernovae.net (International Supernovae Network). Archived from the original on 2011-09-27. Retrieved 2010-06-07.
- ^ David Bishop. "Bright Supernovae - 2008". supernovae.net (International Supernovae Network). Archived from the original on 2011-09-27. Retrieved 2010-06-07.
- ^ "Hungry black hole eats faster than thought possible". Archived from the original on 2016-03-17. Retrieved 2014-10-10.
- ^ "Black hole emitting a giant gas bubble 1000 light-years wide". 8 July 2010.
- ^ Winter, Lisa (October 8, 2014). "Small Black Hole Has Huge Appetite That Defies Theory".
External links
Wikimedia Commons has media related to NGC 7793.
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