Astronomy:NGC 4068
| NGC 4068 | |
|---|---|
 A picture of the NGC 4068 galaxy from the Sloan Digital Sky Survey. | |
| Observation data | |
| Constellation | Ursa Major |
| Right ascension | 12h 04m 2.49s |
| Declination | +52° 35′ 26″ |
| Distance | 4.36 Mpc (14.2 Mly) |
| Apparent magnitude (B) | 13.3 |
| Characteristics | |
| Type | Dwarf Irregular Galaxy (dIrr) |
| Size | 10,000–12,000 ly (3,100–3,700 pc) |
| Other designations | |
| IC 757, LEDA 38148, MCG+09-20-079, UGC 7047, II 781, GC 2692 | |
NGC 4068 is an irregular galaxy located 4.36 megaparsecs (14.2 million light-years[1] away in the Ursa Major constellation.[2] It was discovered on 12 April 1789 by William Herschel using a 18.7-inch f/13 speculum reflector telescope.[3][4]
Characteristics
NGC 4068 is a dwarf irregular galaxy 10,000–12,000 light-years in diameter.[3] As is the case with most observed galaxies of its type, 4068 has low-metallicity.[1] It is currently undergoing a starburst.[2][5]
Observations
In 2014–2015, researchers using SCORPIO-2 obtained the first two spectroscopic observations of an object later dubbed Object #A.[1] Said object was later observed again twice in 2020 using terahertz time-domain spectroscopy (TDS). Researchers consider the central star in Object #A to be a single star due to TDS observations, excluding the possibility of it being a cluster-ionizing nebula. They hypothesize said star to be 70–80 M☉ and in the late stage of its evolution, with the most likely categorization being a Wolf–Rayet star.[1]
References
- ↑ 1.0 1.1 1.2 1.3 Yarovova, Anastasiya D; Egorov, Oleg V; Moiseev, Alexei V; Maryeva, Olga V (2022-11-25). "Unveiling the nitrogen-rich massive star in the metal-poor galaxy NGC 4068" (in en). Monthly Notices of the Royal Astronomical Society 518 (2): 2256–2272. doi:10.1093/mnras/stac2949. ISSN 0035-8711. https://academic.oup.com/mnras/article/518/2/2256/6761713.
- ↑ 2.0 2.1 Sulentic, Jack W.; Tifft, William G. (1980). The revised new general Catalogue of nonstellar astronomical objects (5. print ed.). Tucson, Ariz: The Univ. of Arizona Pr. ISBN 978-0-8165-0421-3.
- ↑ 3.0 3.1 "New General Catalog Objects: NGC 4050 - 4099". https://cseligman.com/text/atlas/ngc40a.htm#4068.
- ↑ "DOCdb - NGC 4068". https://www.docdb.net/show_object.php?id=ngc_4068.
- ↑ "Starbursts in Dwarf Galaxies are a Global Affair - NASA Science" (in en-US). 2009-04-30. https://science.nasa.gov/missions/hubble/starbursts-in-dwarf-galaxies-are-a-global-affair/.
category:Ursa Major category:dwarf irregular galaxies category:IC objects 007047
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