NGC 7793
| NGC 7793 | |
|---|---|
NGC 7793 as observed with the Spitzer Space Telescope as part of the Spitzer Infrared Nearby Galaxy Survey. The blue colors represent the 3.6 micrometre emission from stars. The green and red colors represent the 5.8 and 8.0 micrometre emission from polycyclic aromatic hydrocarbons and possibly dust.
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| Observation data (J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 23h 57m 49.8s[1] |
| Declination | −32° 35′ 28″[1] |
| Redshift | 227 ± 2 km/s[1] |
| Distance | 12.7 ± 1.3 Mly (3.9 ± 0.4 Mpc)[2][3][4] |
| Type | SA(s)d[1] |
| Apparent dimensions (V) | 9′.3 × 6′.3[1] |
| Apparent magnitude (V) | 10.0[1] |
| Other designations | |
| PGC 73049[1] | |
NGC 7793 is a spiral galaxy about 12.7 million light-years away in the constellation Sculptor. It was discovered in 1826 by James Dunlop.[5]
Contents
Galaxy group information
NGC 7793 is one of the brightest galaxies within the Sculptor Group, a group of galaxies in the constellation of the same name. The group itself is an elongated, loosely bound group of galaxies with the Sculptor Galaxy (NGC 253) and its companion galaxies forming a tightly-bound core of galaxies near the center.[2]
Supernova 2008bk
On March 25, 2008, SN 2008bk was discovered in NGC 7793.[6] At apparent magnitude 12.5, it became the 2nd brightest supernova of 2008.[7]
Black hole P13 in outer spiral
Jets from a black hole named P13 power a large nebula named 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.[8] 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.[9][10]
Gallery
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Jets and explosions in NGC 7793.jpg
Spiral arms and small central bulge[11]
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Image of the chaotic spiral galaxy NGC 7793
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Hungry black hole eats faster than thought possible
- ↑ Black hole emitting a giant gas bubble 1000 light-years wide
- ↑ Small Black Hole Has Huge Appetite That Defies Theory October 8, 2014 | by Lisa Winter
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
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