Back Holmberg 15A Spanish هولمبرگ ۱۵ای Persian Holmberg 15A French Holmberg 15A Portuguese Holmberg 15A Russian
| Holmberg 15A | |
|---|---|
 Holmberg 15A (in the center) in X-rays by Chandra X-ray Observatory | |
| Observation data (J2000.0 epoch) | |
| Constellation | Cetus |
| Right ascension | 00h 41m 50.5s |
| Declination | −09° 18′ 11″ |
| Redshift | 0.055672 |
| Heliocentric radial velocity | 16690 km/s |
| Galactocentric velocity | 16747 km/s |
| Distance | 704×106 ly (216 Mpc) h−1 0.678 |
| Group or cluster | Abell 85 |
| Apparent magnitude (V) | 14.7 |
| Characteristics | |
| Type | cD;BrClG |
| Mass | 7×1013 M☉ |
| Number of stars | 5×1012 |
| Size | 270,000 ly (83 kpc) |
| Apparent size (V) | 1.3 moa |
| Other designations | |
| Abell 85-BCG, PGC 2501 | |
Preview warning: Page using Template:Infobox galaxy with unknown parameter "discoverer"
Holmberg 15A (abbreviated to Holm 15A) is a supergiant elliptical galaxy and the central dominant galaxy of the Abell 85 galaxy cluster in the constellation Cetus, about 700 million light-years from Earth.[1] It was discovered c. 1937 by Erik Holmberg.[2] It became well known when it was reported to have the largest core ever observed in a galaxy, spanning some 15,000 light years,[2] however this was subsequently refuted.[3][4]
- ^ "Astronomers Just Found an Absolutely Gargantuan Black Hole The Mass of 40 Billion Suns". 6 August 2019.
- ^ a b López-Cruz, O.; Añorve, C.; Birkinshaw, M.; Worrall, D. M.; Ibarra-Medel, H. J.; Barkhouse, W. A.; Torres-Papaqui, J. P.; Motta, V. (2014). "The Brightest Cluster Galaxy in Abell 85: The Largest Core Known So Far". The Astrophysical Journal. 795 (2): L31. arXiv:1405.7758. Bibcode:2014ApJ...795L..31L. doi:10.1088/2041-8205/795/2/L31. S2CID 1140857.
- ^ Bonfini, Paolo; Dullo, Bililign T.; Graham, Alister W. (2015), Too Big to Be Real? No Depleted Core in Holm 15A
- ^ Madrid, Juan P.; Donzelli, Carlos J. (2016), The Abell 85 BCG: A Nucleated, Coreless Galaxy