NGC 1156

NGC 1156 is a dwarf irregular galaxy in the Aries constellation of the type ibm. It is considered a Magellanic-type irregular. The galaxy has a larger than average core, and contains zones of contra-rotating gas. The counter-rotation is thought to be the result of tidal interactions with another gas rich galaxy some time in the past.

NGC 1156
NGC 1156 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationAries
Right ascension 02h 59m 42.2s[1]
Declination+25° 14′ 14″[1]
Redshift375 ± 1 km/s[1]
Apparent magnitude (V)12.3[1]
Characteristics
TypeIB(s)m[1]
Apparent size (V)3′.3 × 2′.5[1]
Other designations
UGC 2455,[1] PGC 11329[1]

The AGES survey has discovered a candidate dark galaxy close to NGC 1156, one of only a few so far found.

It has a H II nucleus.[2]

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 1156. Retrieved 2006-11-27.
  2. Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112. pp. 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041.


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