NGC 2915

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NGC 2915
NGC2915 3.6 5.8 8.0 microns spitzer.png
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)
ConstellationChamaeleon
Right ascension09h 26m 11.5s[1]
Declination−76° 37′ 35″[1]
Redshift468 ± 3 km/s[1]
Distance12.3 Mly (3.78 Mpc)[2]
Apparent magnitude (V)13.3[1]
Characteristics
TypeI0[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 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]

  1. ^ a b c d e f g "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.{{cite web}}: CS1 maint: archived copy as title (link)
  4. ^ 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.

References[edit]

External links[edit]

  • Media related to NGC 2915 at Wikimedia Commons

Coordinates: Sky map 09h 26m 11.5s, −76° 37′ 35″