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Title:
A lower limit to the accretion disc radius in the low-luminosity AGNNGC 1052 derived from high-angular resolution data
Authors:
Reb, Lennart; Fernández-Ontiveros, Juan A.; Prieto, M. Almudena; Dolag, Klaus
Affiliation:
AA(Universitäts-Sternwarte München, Scheinerstraße 1, D-81679 München, Germany; Instituto de Astrofí­sica de Canarias, C/Vía Láctea, E-38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, Avd. Astrofísico Fco. Sánchez s/n, E-38206 La Laguna, Tenerife, Spain), AB(Instituto de Astrofí­sica de Canarias, C/Vía Láctea, E-38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, Avd. Astrofísico Fco. Sánchez s/n, E-38206 La Laguna, Tenerife, Spain), AC(Instituto de Astrofí­sica de Canarias, C/Vía Láctea, E-38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, Avd. Astrofísico Fco. Sánchez s/n, E-38206 La Laguna, Tenerife, Spain), AD(Universitäts-Sternwarte München, Scheinerstraße 1, D-81679 München, Germany; Max-Planck Institute for Astrophysics, Karl-Schwarzschild-Straße 1, D-85741 Garching, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 478, Issue 1, p.L122-L126 (MNRAS Homepage)
Publication Date:
07/2018
Origin:
OUP
Astronomy Keywords:
accretion, accretion discs, black hole physics, galaxies: individual: NGC 1052, galaxies: jets, galaxies: nuclei
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnrasl/sly079
Bibliographic Code:
2018MNRAS.478L.122R

Abstract

We investigate the central sub-arcsec region of the low-luminosity active galactic nucleusNGC 1052, using a high-angular resolution data set that covers 10 orders of magnitude in frequency. This allows us to infer the continuum emission within the innermost ˜17 pc around the black hole to be of non-thermal, synchrotron origin and to set a limit to the maximum contribution of a standard accretion disc. Assuming the canonical 10 per cent mass-light conversion efficiency for the standard accretion disc, its inferred accretion power would be too low by one order of magnitude to account for the observed continuum luminosity. We thus introduce a truncated accretion disc and derive a truncation radius to mass-light conversion efficiency relation, which we use to reconcile the inferred accretion power with the continuum luminosity. As a result we find that a disc providing the necessary accretion power must be truncated at rtr ≳ 26 rg, consistent with the inner radius derived from the observations of the Fe Kalpha line in the X-ray spectrum of this nucleus. This is the first time to derive a limit on the truncation radius of the accretion disc from high-angular resolution data only.
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