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	09^h 26^m 11.5^s[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. "NASA/IPAC Extragalactic Database". Results for NGC 2915. Retrieved 2007-03-19.
2. 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.
3. "Archived copy". wwwatnf.atnf.csiro.au. Archived from the original on 12 July 2002. Retrieved 30 June 2022.
4. 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)
5. 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

• NGC 2915 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

External links

• Media related to NGC 2915 at Wikimedia Commons