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Title: THE BRIGHTEST CLUSTER GALAXY IN A85: THE LARGEST CORE KNOWN SO FAR

We have found that the brightest cluster galaxy (BCG) in A85, Holm 15A, displays the largest core known so far. Its cusp radius, r {sub γ} = 4.57 ± 0.06 kpc (4.''26 ± 0.''06), is more than 18 times larger than the mean for BCGs and ≳ 1 kpc larger than A2261-BCG, hitherto the largest-cored BCG. Holm 15A hosts the luminous amorphous radio source 0039-095B and has the optical signature of a LINER. Scaling laws indicate that this core could host a supermassive black hole (SMBH) of mass M {sub •} ∼ (10{sup 9}-10{sup 11}) M {sub ☉}. We suggest that cores this large represent a relatively short phase in the evolution of BCGs, whereas the masses of their associated SBMH might be set by initial conditions.
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Astrofísica, Luis Enrique Erro No.1, Tonantzintla, Pue., C.P. 72840 (Mexico)
  2. HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL (United Kingdom)
  3. Department of Physics and Astrophysics, University of North Dakota, Grand Forks, ND 58202 (United States)
  4. Departamento de Astronomía, Universidad de Guanajuato (DAUG), Callejón Jalisco S/N Col. Valenciana, C.P. 36240 Guanajuato, Gto. (Mexico)
  5. Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111 Varaíso (Chile)
Publication Date:
OSTI Identifier:
22364498
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 795; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; CUSPED GEOMETRIES; GALACTIC EVOLUTION; GALAXIES; GALAXY CLUSTERS; GALAXY NUCLEI; MASS; PHOTOMETRY; SCALING LAWS