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]
| 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] | |
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
edit- ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for NGC 2915. Retrieved 2007-03-19.
- ^ I. D. Karachentsev; V. E. Karachentseva; W. K. Huchtmeier; D. I. Markarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
- ^ "Archived copy". wwwatnf.atnf.csiro.au. Archived from the original on 12 July 2002. Retrieved 30 June 2022.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ a b 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. arXiv:astro-ph/0212049. Bibcode:2003ApJ...586..152M. doi:10.1086/367550. ISSN 0004-637X. S2CID 18683377.
{{cite journal}}:|last2=has generic name (help) - ^ Tang, Yimeng; Tao, Bojun; Zhang, Hong-Xin; Chen, Guangwen; Gao, Yulong; Lin, Zesen; Yao, Yao; Shi, Yong; Kong, Xu (2022). "Unveiling the formation of NGC 2915 with MUSE: A counter-rotating stellar disk embedded in a disordered gaseous environment". Astronomy & Astrophysics. 668: A179. arXiv:2210.06485. Bibcode:2022A&A...668A.179T. doi:10.1051/0004-6361/202243944. S2CID 252873264.
References
edit- NGC 2915 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
External links
edit
Media related to NGC 2915 at Wikimedia Commons
 | This galaxy-related article is a stub. You can help Wikipedia by expanding it. |