The blazar S 5 0014 + 813 : a real or apparent monster ?
نویسنده
چکیده
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 M ∼ 4×10 10 M⊙, radiating at 40% the Eddington value. The derived mass is among the largest ever found. Super–Eddington slim disks or thick disks with the presence of a collimating funnel can in principle reduce the black hole mass estimate, but tends to produce spectra bluer than observed.
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