NGC 4945

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]

NGC 4945
NGC 4945 image take by the MPG/ESO 2.2-metre telescope at La Silla Observatory
Observation data (J2000 epoch)
ConstellationCentaurus
Right ascension13h 05m 27.5s[1]
Declination−49° 28′ 06″[1]
Redshift563 ± 3 km/s[1]
Distance11.7 Mly (3.6 Mpc)[2]
Apparent magnitude (V)9.3[1]
Characteristics
TypeSB(s)cd[1]
Apparent size (V)20.0′ × 3.8′[1]
Other designations
PGC 45279,[1] Caldwell 83
The location of NGC 4945 (labelled in red)

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]

NGC 4945 is the title of a song by Brett Domino on the album "Funk".

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 4945. Retrieved 2006-11-25.
  2. 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.
  3. http://www.docdb.net/show_object.php?id=ngc_4945, NGC 4945 : DOCdb :Deep Sky Observer's Companion – the online database
  4. "Milky Way's Not-So-Distant Cousin Likely Harbors Supermassive Black Hole". Science Daily.
  5. 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.
  6. 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.
  7. Transient Name Server entry for SN 2005af. Retrieved 25 March 2023.
  8. Transient Name Server entry for SN 2011ja. Retrieved 25 March 2023.
  9. 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.
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