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Galaxy in the constellation Lepus From Wikipedia, the free encyclopedia
NGC 2139 is a barred spiral galaxy in the constellation of Lepus.[4] It was discovered on November 17, 1784, by the German-English astronomer William Herschel.[7] The galaxy is located at a distance of 120.6 million light-years (36.98 Mpc) from the Sun and is receding with a radial velocity of 1,836 km/s.[3]
NGC 2139 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Lepus |
Right ascension | 06h 01m 07.963s[1] |
Declination | −23° 40′ 20.35″[1] |
Redshift | 0.006148±0.000017[2] |
Heliocentric radial velocity | 1,836 km/s[3] |
Galactocentric velocity | 1,649 km/s[3] |
Distance | 120.6 Mly (36.98 Mpc)[3] |
Apparent magnitude (V) | 11.6[4] |
Apparent magnitude (B) | 11.98[3] |
Characteristics | |
Type | SAB(rs)cd[5] |
Number of stars | 9.1×109 M☉[5] |
Apparent size (V) | 2.40′ × 1.9′[4] |
Notable features | Bulgeless |
Other designations | |
NGC 2139, IC 2154, LEDA 18258, MCG -04-15-005, PGC 18258[6] |
The overall form of this galaxy is irregular with spiral arms and the appearance of tidal features, suggesting a potential recent merger event. There is no central bulge of significance.[8] The morphological classification is SAB(rs)cd,[5] which indicates a barred spiral galaxy (SAB) with a transitional inner ring structure (rs) and loosely wound spiral arms (cd). It is a star forming galaxy with a formation rate of 3.8 M☉·yr−1.[5] There is a plume extending to the south of the galaxy.[8]
A luminous filament runs through the center of the galaxy, which includes a small nuclear cluster. This cluster is only 4.1×107 years old with a mass of 8.3×105 M☉.[8] It is offset at a distance of 320 pc from the center of the galaxy and may come to rest there on a time scale of around 100 million years.[9] The cluster is a source of X-ray emission.[10]
Three supernovae have been observed in NGC 2139:
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