The Brightest Cluster Galaxy in Abell 85: The Largest Core Known so far
| Autor: | Juan Pablo Torres-Papaqui, Hector Ibarra-Medel, Mark Birkinshaw, Wayne A. Barkhouse, Omar Lopez-Cruz, Diana M Worrall, C. Añorve, Veronica Motta |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | 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 ', Astrophysical Journal Letters, vol. 795, no. 2, L31 . https://doi.org/10.1088/2041-8205/795/2/L31 |
| DOI: | 10.1088/2041-8205/795/2/L31 |
| Popis: | We have found that the brightest cluster galaxy (BCG) in Abell~85, Holm 15A, displays the largest core so far known. Its cusp radius, $r_{\gamma} = 4.57 \pm 0.06$ kpc ($4.26^{\prime\prime}\pm 0.06^{\prime\prime}$), is more than 18 times larger than the mean for BCGs, and $\geq1$ kpc larger than A2261-BCG, hitherto the largest-cored BCG (Postman, Lauer, Donahue, et al. 2012) 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 $M_{\bullet}\thicksim (10^{9}-10^{11})\,M_{\odot}$. 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. Comment: 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 |
| Databáze: | OpenAIRE |
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