The Astrophysical Journal Letters
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 (426 ± 006), 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 • ~ (109-1011) 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.
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López-Cruz, O.; Añorve, C.; Birkinshaw, M.; Worrall, D. M.; Ibarra-Medel, H. J.; Barkhouse, Wayne A.; Torres-Papaqui, J. P.; and Motta, V., "The Brightest Cluster Galaxy in Abell 85: The Largest Core Known So Far" (2014). Physics Faculty Publications. 11.