NGC 4559 (also known as Caldwell 36) is an intermediate spiral galaxy with a weak inner ring structure in the constellation Coma Berenices. Distance estimates for NGC 4559 range from about 28 million light-years to 31 million light-years, averaging about 29 million light-years.[1] It was discovered on 11 April 1785 by German-British astronomer William Herschel.[2]
| NGC 4559 | |
|---|---|
.jpg) NGC 4559 imaged by the Sloan Digital Sky Survey | |
| Observation data (J2000 epoch) | |
| Constellation | Coma Berenices |
| Right ascension | 12h 35m 57.6285s[1] |
| Declination | +27° 57′ 35.851″[1] |
| Redshift | 816 ± 9 km/s[1] |
| Distance | ~ 29 Mly (8.859 Mpc)[1] |
| Apparent magnitude (V) | 10.4[1] |
| Characteristics | |
| Type | SAB(rs)cd[1] |
| Apparent size (V) | 10.7′ × 4.4′[1] |
| Other designations | |
| Caldwell 36, HOLM 423A, IRAS 12334+2814, UGC 7766, MCG +05-30-030, PGC 42002, CGCG 159-024[1] | |
NGC 4559 is a member of the Coma I Group.[3][4]
Supernova
editOne supernova has been recorded in NGC 4559: SN 1941A (Type II-L, mag. 13.2)[5] was discovered by Rebecca Jones on 24 February 1941, and after checking previous photographs of the galaxy, it was determined that the supernova was visible starting 5 February 1941.[6]
Luminous Blue Variable
editNGC 4559 is home to the luminous blue variable AT 2016blu, which experiences repeated supernova-like outbursts. First observed in January 2012, it burst out again in 2014, 2016, 2017, 2018, 2019, 2020, 2021, 2022, and 2024.[7][8]
See also
edit- Messier 99 – a similar spiral galaxy
Gallery
edit-
Hubble Space Telescope showing the inner structure -
Hubble image of IC 3550, located in NGC 4559.
References
edit- ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for NGC 4559. Retrieved 2020-12-21.
- ^ Seligman, Courtney. "NGC 4559". Celestial Atlas. Retrieved 15 August 2024.
- ^ Sandage, A.; Tammann, G.A. (1975). "Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field". The Astrophysical Journal. 196: 313–328. Bibcode:1975ApJ...196..313S. doi:10.1086/153413. ISSN 0004-637X.
- ^ Gregory, S.A.; Thompson, L. A. (1977). "The Coma I Galaxy Cloud". The Astrophysical Journal. 213: 345–350. Bibcode:1977ApJ...213..345G. doi:10.1086/155160. ISSN 0004-637X.
- ^ "SN 1941A". Transient Name Server. IAU. Retrieved 14 August 2024.
- ^ Elis, Stromgren (24 April 1941). "Circular No. 861". Central Bureau for Astronomical Telegrams. Observatory Copenhagen. Retrieved 27 November 2024.
- ^ Bishop, David (6 July 2021). "LBV 2016blu in NGC 4559". rochesterastronomy.org. Retrieved 9 August 2021.
- ^ Aghakhanloo, Mojgan; Smith, Nathan; Milne, Peter; Andrews, Jennifer E.; Van Dyk, Schuyler D.; Filippenko, Alexei V.; Jencson, Jacob E.; Lau, Ryan M.; Sand, David J.; Wyatt, Samuel; Zheng, WeiKang (2022). "Recurring outbursts of the supernova impostor AT 2016blu in NGC 4559". Monthly Notices of the Royal Astronomical Society. 526 (1): 456. arXiv:2212.09708. Bibcode:2023MNRAS.526..456A. doi:10.1093/mnras/stad2702.
External links
edit
Media related to NGC 4559 at Wikimedia Commons- NGC 4559 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
