| 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 | 13 05 27.5 |
| Declination | −49° 28′ 06″ |
| Redshift | 563 ± 3 km/s |
| Distance | 11.7 Mly (3.6 Mpc) |
| Apparent magnitude (V) | 9.3 |
| Characteristics | |
| Type | SB(s)cd |
| Apparent size (V) | 20.0′ × 3.8′ |
| Other designations | |
| PGC 45279, Caldwell 83 | |
NGC 4945 (also known as Caldwell 83) is a barred spiral galaxy in the constellation Centaurus, visible near the star Xi Centauri. 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. Around the nucleus of the galaxy, there is a dense disk of dust and gas, along with many dense star clusters. This object has an estimated mass of 1.4+1.4
−0.7×10 M☉.
Supernovae
Two supernovae have been observed in NGC 4945:
- SN 2005af (Type II, mag. 12.8) was discovered by CEAMIG/REA Supernovae Search on 8 February 2005.
- SN 2011ja (type IIP, mag. 14) was discovered by Libert "Berto" Monard on 18 December 2011.
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.
In popular culture
"NGC 4945" is the title of a song by Brett Domino on the album Funk.
References
- ^ "NASA/IPAC Extragalactic Database". Results for NGC 4945. Retrieved 2006-11-25.
- ^ 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. Bibcode:2002A&A...385...21K. doi:10.1051/0004-6361:20020042.
- 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.
- 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. arXiv:2203.03678. Bibcode:2022AJ....163..230G. doi:10.3847/1538-3881/ac5ea4. S2CID 247315251.
- 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, arXiv:0807.2549, Bibcode:2008PASA...25..167G, doi:10.1071/AS08013, S2CID 89905.
- Jacques, C.; Pimentel, E. (2005). "Possible Supernova in NGC 4945". International Astronomical Union Circular (8482): 1. Bibcode:2005IAUC.8482....1J.
- "SN 2005af". Transient Name Server. IAU. Retrieved 8 December 2024.
- Monard, L. A. G.; Milisavljevic, D.; Fesen, R.; Pickering, T.; Romero-Colmenero, E.; Turatto, M.; Benetti, S.; Pastorello, A.; Valenti, S.; Bufano, F.; Tomasella, L.; Ryder, S.; Soderberg, A.; Stockdale, C.; Van Dyk, S.; Immler, S.; Weiler, K.; Panagia, N. (2011). "Supernova 2011ja in NGC 4945 = PSN J13051112-4931270". Central Bureau Electronic Telegrams. 2946: 1. Bibcode:2011CBET.2946....1M.
- "SN 2011ja". Transient Name Server. IAU. Retrieved 8 December 2024.
- I. D. Karachentsev (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal. 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode:2005AJ....129..178K. doi:10.1086/426368. S2CID 119385141.
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)
| Caldwell catalogue | |
|---|---|
| List |
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| See also | |
