The blazar S5 0014+813: a real or apparent monster?
G. Ghisellini (1), L. Foschini (1), M. Volonteri (2), G. Ghirlanda, (1), F. Haardt (3), D. Burlon (4), F. Tavecchio (1) ((1) INAF-OABrera, Italy,, (2) Univ. of Michigan, USA, (3) Univ. Insubria, Como, Italy, (4) Max Planck, Inst. extrat. Physik, Garching, Germany)

TL;DR
This study confirms the presence of an extremely massive black hole in the blazar S5 0014+813, with an estimated mass of 40 billion solar masses, based on multi-wavelength observations and spectral energy distribution analysis.
Contribution
It provides a detailed spectral energy distribution analysis confirming one of the largest black hole masses ever estimated in a blazar.
Findings
Black hole mass estimated at 40 billion solar masses.
Optical-UV emission consistent with a standard accretion disk.
Black hole radiates at 40% of the Eddington luminosity.
Abstract
A strong hard X-ray luminosity from a blazar flags the presence of a very powerful jet. If the jet power is in turn related to the mass accretion rate, the most luminous hard X-ray blazars should pinpoint the largest accretion rates, and therefore the largest black hole masses. These ideas are confirmed by the Swift satellite observations of the blazar S5 0014+813, at the redshift z=3.366. Swift detected this source with all its three instruments, from the optical to the hard X-rays. Through the construction of its spectral energy distribution we are confident that its optical-UV emission is thermal in origin. Associating it to the emission of a standard optically thick geometrically thin accretion disk, we find a black hole mass of 40 billion solar masses, radiating at 40% the Eddington value. The derived mass is among the largest ever found. Super-Eddington slim disks or thick disks…
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