NGC 4051
Galaxy in the constellation Ursa Major
From Wikipedia, the free encyclopedia
NGC 4051 is an intermediate spiral galaxy in the constellation of Ursa Major.[2] It was discovered on 6 February 1788 by William Herschel.
| NGC 4051 | |
|---|---|
The nucleus of NGC 4051 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 12h 03m 09.686s[1] |
| Declination | +44° 31′ 52.54″[1] |
| Redshift | 0.002336[2] |
| Heliocentric radial velocity | 700 km/s[2] |
| Distance | 54.14 ± 0.98 Mly (16.6 ± 0.3 Mpc)[3] |
| Group or cluster | Ursa Major Cluster |
| Apparent magnitude (V) | 12.92[4] |
| Apparent magnitude (B) | 11.08[4] |
| Characteristics | |
| Type | SAB(rs)bc[2] |
| Size | 78,800 ly (24,160 pc)[2][note 1] |
| Apparent size (V) | 6.00′ × 4.98′[2][note 1] |
| Other designations | |
| IRAS 12005+4448, UGC 7030, PGC 38068, CGCG 243-038[4][2] | |
NGC 4051 contains a supermassive black hole with a mass of 1.73 million M☉.[5] This galaxy was studied by the Multicolor Active Galactic Nuclei Monitoring 2m telescope.[6]
The galaxy is a Seyfert galaxy that emits bright X-rays. However, in early 1998 the X-ray emission ceased as observed by the Beppo-SAX satellite. X-ray emission had risen back to normal by August 1998.[7]
NGC 4051 is a member of the Ursa Major Cluster.[8][9][10] Its peculiar velocity is −490 ± 34 km/s, consistent with the rest of the cluster.[3] It is a member of the NGC 4111 Group,[11][12] which is part of the Ursa Major Cloud and is the second largest group in the cloud after the NGC 3992 Group.[13][14][15]
Supernovae
Three supernovae have been discovered in NGC 4051:
- SN 1983I (Type Ic, mag. 13.5) was discovered independently by J. Kielkopf et al, on 11 May 1983, and by Tsvetkov on 12 May 1983.[16][17]
- SN 2003ie (Type II, mag. 15.2) was discovered by Ron Arbour on 19 September 2003.[18][19]
- SN 2010br (Type Ib/c, mag. 17.7) was discovered by Vitali Nevski on 10 April 2010.[20][21]
