Astronomy:NGC 2915
| NGC 2915 | |
|---|---|
 NGC 2915 as observed with the Spitzer Space Telescope (SST) as part of the SINGS 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 | |
| Observation data (J2000 epoch) | |
| Constellation | Chamaeleon |
| Right ascension | 09h 26m 11.5s[1] |
| Declination | −76° 37′ 35″[1] |
| Redshift | 468 ± 3 km/s[1] |
| Distance | 12.3 Mly (3.78 Mpc)[2] |
| Apparent magnitude (V) | 13.3[1] |
| Characteristics | |
| Type | I0[1] |
| Apparent size (V) | 1.9′ × 1.0′[1] |
| Other designations | |
| PGC 26761[1] | |
NGC 2915 is a blue dwarf galaxy located 12 million light-years away in the southern constellation Chamaeleon, right on the edge of the Local Group. The optical galaxy corresponds to the core of a much larger spiral galaxy traced by radio observation of neutral hydrogen.[3]
The galaxy has a short central bar, much like the Milky Way and very extended spiral arms.[4] The central disk appears to be rotating in the opposite direction to the extended spiral arms.[5]
The reason for the spiral arms and majority of the galaxy's disk to be still neutral hydrogen (as opposed to have formed stars) is not well understood but is thought to be related to the galaxy's isolation, in that it has no nearby satellite galaxies and no nearby major galaxies to force star formation.[4]
Notes
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "NASA/IPAC Extragalactic Database". Results for NGC 2915. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+2915#ObjNo1.
- ↑ I. D. Karachentsev; V. E. Karachentseva; W. K. Huchtmeier; D. I. Markarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127 (4): 2031–2068. doi:10.1086/382905. Bibcode: 2004AJ....127.2031K.
- ↑ "Archived copy". http://wwwatnf.atnf.csiro.au/people/bkoribal/ngc2915/n2915.html.
- ↑ 4.0 4.1 Masset, F. S.; Bureau, M. (2003-03-20). "On the Spiral Structure of NGC 2915 and Dark Matter". The Astrophysical Journal 586 (1): 152–169. doi:10.1086/367550. ISSN 0004-637X. Bibcode: 2003ApJ...586..152M.
- ↑ Tang, Yimeng; Tao, Bojun; Zhang, Hong-Xin; Chen, Guangwen; Gao, Yulong; Lin, Zesen; Yao, Yao; Shi, Yong et al. (2022). "Unveiling the formation of NGC 2915 with MUSE: A counter-rotating stellar disk embedded in a disordered gaseous environment". Astronomy & Astrophysics 668: A179. doi:10.1051/0004-6361/202243944. Bibcode: 2022A&A...668A.179T.
References
- NGC 2915 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
External links
Coordinates: 
09h 26m 11.5s, −76° 37′ 35″
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