NGC 1140 explained
| NGC 1140 |
| Epoch: | J2000 |
| Constellation Name: | Eridanus |
| Ra: | [1] |
| Z: | 0.005007[2] |
| H Radial V: | 1150 km/s |
| Dist Ly: | 18.233+/- |
| Type: | IBm pec |
| Appmag V: | 12.25 |
| Appmag B: | 12.84[3] |
| Absmag V: | -19.05 |
| Size V: | 1.7 × 0.9 |
| Notes: | Wolf–Rayet galaxy |
| Names: | Markarian 1063, VV 482, MCG-02-08-019, PGC 10966 |
NGC 1140 is an irregular galaxy in the southern constellation of Eridanus. Estimates made using the Tully–Fisher method put the galaxy at about 59 million light years (18 megaparsecs).[2] It was discovered on 22 November 1786 by William Herschel, and was described as "pretty bright, small, round, stellar" by John Louis Emil Dreyer, the compiler of the New General Catalogue.[4]
NGC 1140 is a starburst galaxy, meaning it is forming stars at a very fast rate. In fact, while it is only a tenth as wide as the Milky Way, it is producing stars at a rate of /yr, about the same as the Milky Way. The image taken by the Hubble Space Telescope shows bright blue and red regions of star formation, similar to NGC 1569. The starburst is estimated to have begun about 5 million years ago. Its low metallicity (the ratio of hydrogen and helium to other elements) makes NGC 1140 similar to primordial galaxies.[5]
Notes and References
- 2003yCat.2246....0C . VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) . CDS/ADC Collection of Electronic Catalogues . II/246 . 2246 . Cutri . Roc M. . Skrutskie . Michael F. . Van Dyk . Schuyler D. . Beichman . Charles A. . Carpenter . John M. . Chester . Thomas . Cambresy . Laurent . Evans . Tracey E. . Fowler . John W. . Gizis . John E. . Howard . Elizabeth V. . Huchra . John P. . Jarrett . Thomas H. . Kopan . Eugene L. . Kirkpatrick . J. Davy . Light . Robert M. . Marsh . Kenneth A. . McCallon . Howard L. . Schneider . Stephen E. . Stiening . Rae . Sykes . Matthew J. . Weinberg . Martin D. . Wheaton . William A. . Wheelock . Sherry L. . Zacarias . N. . 2003 .
- Web site: NED results for object NGC 1140. National Aeronautics and Space Administration / Infrared Processing and Analysis Center. 4 March 2017.
- NGC 1140. 4 March 2017.
- Web site: New General Catalogue objects: NGC 1100 - 1149. Seligman, Courtney. cseligman.com. 4 March 2017.
- Photometric and spectroscopic studies of star-forming regions within Wolf-Rayet galaxies. Karthick, M. Chrisphin. López-Sánchez, Ángel R.. Sahu, D. K.. Sanwal, B. B.. Bisht, Shuchi. Monthly Notices of the Royal Astronomical Society. 439. 1. 157–178. 2014. 2014MNRAS.439..157K. 10.1093/mnras/stt2301. 1311.7504.
- Web site: Intense and short-lived . www.spacetelescope.org. 2015. 4 March 2017.
- Web site: A galactic nursery | ESA/Hubble|website=www.spacetelescope.org|date=2015|access-date=4 March 2017}}
Wolf–Rayet star
]s, a class of blue, massive, and luminous stars, are present in this galaxy; in fact, NGC 1140 has so many of them that their spectra also appear in the galaxy's spectrum.[5] These types of galaxies are known Wolf–Rayet galaxies, and are fairly rare because Wolf–Rayet stars are a short stage in the lives of very massive stars.[6] External links
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