| NGC 2146 | |
|---|---|
 HST image of NGC 2146. | |
| Observation data (J2000 epoch) | |
| Constellation | Camelopardalis |
| Right ascension | 06h 18m 37.7s[1] |
| Declination | +78° 21′ 25″[1] |
| Redshift | 893 ± 5 km/s[1] |
| Distance | 70,000,000 lyr |
| Apparent magnitude (V) | 11.38[1] |
| Characteristics | |
| Type | SB(s)ab pec[1] |
| Apparent size (V) | 6′.0 × 3′.4[1] |
| Other designations | |
| UGC 3429,[1] CGCG 348-017, MCG +13-05-0, 4C +78.06, PGC 18797[1] | |
NGC 2146 (also known as the Dusty Hand Galaxy[2]) is a barred spiral galaxy type SB(s)ab pec in the constellation Camelopardalis. The galaxy was discovered in 1876 by Friedrich August Theodor Winnecke.[3]
It has a diameter of 80,000 lyr.[3] The galaxy's most conspicuous feature is the dusty lanes of a spiral arm lying across the core of the galaxy as seen from Earth, the arm having been bent 45 degrees by a close encounter with a smaller galaxy possibly NGC 2146a about 0.8 billion years ago.[3] This close encounter is credited with the relatively high rates of star formation that qualify NGC 2146 as a starburst galaxy.[3]
It has been host to two known supernova events:
- SN 2005V, a type Ib/c supernova discovered by LIRIS on 30 January 2005.[4][5]
- SN 2018zd, a type II supernova (possibly type IIn[6] and maybe the first electron-capture supernova[7][8][9]), was discovered on 2 March 2018 by Kōichi Itagaki.[10]
- ^ a b c d e f g h NED (July 16, 2012), Results for search on NGC 2146
- ^ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
- ^ a b c d "Feeling the strain". The Hubble European Space Agency Information Centre. 22 August 2011. Retrieved 6 October 2012.
- ^ Mattlla, S; Greimel, R; Meikle, P (2005). "LIRIS Discovers Supernovae in Starburst Galaxies" (PDF). The Newsletter of the Isaac Newton Group of Telescopes. 9: 16. Bibcode:2005INGN....9...16M. Retrieved 8 July 2015.
- ^ "Image of supernova 2005V". rochesterastronomy.org. 4 February 2005. Retrieved 10 March 2018.
- ^ Zhang, Jujia; Xu, Liang; Wang, Xiaofeng (6 March 2018). "ATEL #11379: Spectroscopic Classification of SN 2018zd as a very young Type IIn Supernova". Retrieved 10 March 2018.
- ^ Hiramatsu D, Howell D, Van S, et al. (28 June 2021). "The electron-capture origin of supernova 2018zd". Nat Astron. 5 (9): 903–910. arXiv:2011.02176. Bibcode:2021NatAs...5..903H. doi:10.1038/s41550-021-01384-2. S2CID 226246044.
- ^ "New, Third Type Of Supernova Observed". W. M. Keck Observatory. 28 June 2021.
- ^ "Astronomers discover new type of supernova". RTE News. PA. 28 June 2021. Retrieved 1 July 2021.
In 1980, Ken'ichi Nomoto of the University of Tokyo predicted a third type called an electron capture supernova. ... In an electron capture supernova, as the core runs out of fuel, gravity forces electrons in the core into their atomic nuclei, causing the star to collapse in on itself.
- ^ "SN 2018zd". Transient Name Server. 2 March 2018. Retrieved 10 March 2018.