2014/05/31 by Omar Lopez‐Cruz, O. López-Cruz, C. Añorve +8 · 51 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics #Brightest cluster galaxy #Cluster (spacecraft) #Core (optical fiber) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Optics #Physics #RADIUS #Supermassive black hole #astro-ph.GA
paper · pdf · doi:10.1088/2041-8205/795/2/l31
published in The Astrophysical Journal Letters 795(2), L31 (IOP Publishing) · 14 pages, 3 figure, 2 tables, accepted for publication in ApJ Letters on October 6th, 2014, replacement of previous manuscript submitted on May 30th, 2014 to astro-ph
arxiv created 2014/10/15 · openalex publication_date 2014/10/22 · arxiv updated 2015/06/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have found that the brightest cluster galaxy (BCG) in A85, Holm 15A, displays the largest core known so far. Its cusp radius, r 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 • ∼ (10 9 –10 11 ) M ☉ . 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.