Astronomy:NGC 4945
| NGC 4945 | |
|---|---|
 NGC 4945 image take by the MPG/ESO 2.2-metre telescope at La Silla Observatory | |
| Observation data (J2000 epoch) | |
| Constellation | Centaurus |
| Right ascension | 13h 05m 27.5s[1] |
| Declination | −49° 28′ 06″[1] |
| Redshift | 563 ± 3 km/s[1] |
| Distance | 11.7 Mly (3.6 Mpc)[2] |
| Apparent magnitude (V) | 9.3[1] |
| Characteristics | |
| Type | SB(s)cd[1] |
| Apparent size (V) | 20.0′ × 3.8′[1] |
| Other designations | |
| PGC 45279,[1] Caldwell 83 | |
Coordinates: 
13h 05m 27.5s, −49° 28′ 06″
NGC 4945 (also known as Caldwell 83) is a barred spiral galaxy in the constellation Centaurus, visible near the star Xi Centauri.[3] The galaxy was discovered by James Dunlop in 1826 and is thought to be similar to the Milky Way Galaxy, although X-ray observations show that NGC 4945 has an unusual energetic Seyfert 2 nucleus that might house a supermassive black hole.[4] Around the nucleus of the galaxy, there is a dense disk of dust and gas, along with many dense star clusters.[5] This object has an estimated mass of 1.4+1.4
−0.7×1011 M☉.[6]
Two supernovae have been observed in NGC 4945: SN 2005af (Type II, mag. 12.8),[7] and SN 2011ja (type IIP, mag. 14).[8]
Galaxy group
NGC 4945 one of the brightest galaxies of the Centaurus A/M83 Group, a large, nearby group of galaxies. The galaxy is the second brightest galaxy in the subgroup centered on Centaurus A.[2][9]
In popular culture
NGC 4945 is the title of a song by Brett Domino on the album "Funk".
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "NASA/IPAC Extragalactic Database". Results for NGC 4945. http://nedwww.ipac.caltech.edu/.
- ↑ 2.0 2.1 I. D. Karachentsev; M. E. Sharina; A. E. Dolphin; E. K. Grebel et al. (2002). "New distances to galaxies in the Centaurus A group". Astronomy and Astrophysics 385 (1): 21–31. doi:10.1051/0004-6361:20020042. Bibcode: 2002A&A...385...21K.
- ↑ http://www.docdb.net/show_object.php?id=ngc_4945, NGC 4945 : DOCdb :Deep Sky Observer's Companion – the online database
- ↑ "Milky Way's Not-So-Distant Cousin Likely Harbors Supermassive Black Hole". Science Daily. https://www.sciencedaily.com/releases/2009/09/090902112111.htm.
- ↑ Gaspar, G.; Díaz, R. J.; Mast, D.; Agüero, M. P.; Schirmer, M.; Günthardt, G.; Schmidt, E. O. (2022). "An Infrared View of the Obscured AGN Environment in NGC 4945". The Astronomical Journal 163 (5): 230. doi:10.3847/1538-3881/ac5ea4. Bibcode: 2022AJ....163..230G.
- ↑ Graham, Alister W. (November 2008), "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values", Publications of the Astronomical Society of Australia 25 (4): 167–175, doi:10.1071/AS08013, Bibcode: 2008PASA...25..167G.
- ↑ Transient Name Server entry for SN 2005af. Retrieved 25 March 2023.
- ↑ Transient Name Server entry for SN 2011ja. Retrieved 25 March 2023.
- ↑ I. D. Karachentsev (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal 129 (1): 178–188. doi:10.1086/426368. Bibcode: 2005AJ....129..178K.
External links
- NGC 4945 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- APOD: Nearby Spiral Galaxy NGC 4945 (7/21/02)
- ESO: The milkyway's nearby cousin (2/10/09)
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