NGC 2139
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 | |
|---|---|
Legacy Surveys DR10 image of 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]
Supernovae
Three supernovae have been observed in NGC 2139:
- Robert Evans and associates discovered SN 1995ad (type II, mag. 14) on 28 September 1995.[11][12] It was positioned in one of the spiral arms, 25″ west and 5″ south of the NGC 2139 nucleus. The recession velocity was consistent with that of the host galaxy.[13]
- SN 2022qhy (type Ibn, mag. 15.889) was discovered by ATLAS on 1 August 2022.[14]
- SN 2023zcu (type II, mag. 19.054) was discovered by ATLAS on 8 December 2023.[15]
References
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