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| DOI | 10.1093/MNRAS/STAB3752 | ||||
| Año | 2022 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
According to theory, the torus of active galactic nuclei (AGN) is sustained from a wind coming off the accretion disc, and for low efficient AGN, it has been proposed that such structure disappears. However, the exact conditions for its disappearance remain unclear. This can be studied throughout the reflection component at X-rays, which is associated with distant and neutral material at the inner walls of the torus in obscured AGN. We select a sample of 81 AGNs observed with NuSTAR with a distance limit of D< 200 Mpc and Eddington rate lambda(Edd) L-bol/L-Edd < 10(-3). We fit the 3-70 keV spectra using a model accounting for a partial-covering absorber plus a reflection component from neutral material. We find that the existence of the reflection component spans in a wide range of black hole mass and bolometric luminosities, with only similar to 13 per cent of our sample (11 sources) lacking of any reflection signatures. These sources fall in the region in which the torus may be lacking in the L-MBII diagram. For the sources with a detected reflection component, we find that the vast majority of them are highly obscured (log N-H > 23), with similar to 20 per cent being Compton-thick. We also find an increase in the number of unobscured sources and a tentative increase on the ratio between FeK alpha emission line and Compton-hump luminosities toward lambda(Edd) = 10(-5), suggesting that the contribution of the FeK alpha line changes with Eddington ratio.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Osorio-Clavijo, N. | - |
Inst Radioastron & Astrofis IRyA UNAM - México
Instituto de Radioastronomía y Astrofísica - México |
| 2 | Gonzalez-Martin, O. | - |
Inst Radioastron & Astrofis IRyA UNAM - México
Instituto de Radioastronomía y Astrofísica - México |
| 3 | SANCHEZ-SANCHEZ, SEBASTIAN FRANCISCO | Hombre |
Univ Nacl Autonoma Mexico - México
Universidad Nacional Autónoma de México - México |
| 4 | Esparza-Arredondo, Donaji | - |
Inst Radioastron & Astrofis IRyA UNAM - México
Instituto de Radioastronomía y Astrofísica - México |
| 5 | Masegosa, J. | - |
IAA Inst Astrofis Andalucia CSIC - España
Instituto de Astrofísica de Andalucía - CSIC - España CSIC - Instituto de Astrofísica de Andalucía (IAA) - España |
| 6 | Victoria-Ceballos, C. | - |
Inst Radioastron & Astrofis IRyA UNAM - México
Instituto de Radioastronomía y Astrofísica - México |
| 7 | Hernandez-Garcia, L. | Mujer |
Instituto Milenio de Astrofísica - Chile
Universidad de Valparaíso - Chile |
| 8 | Diaz, Y. | - |
Universidad de Valparaíso - Chile
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| Fuente |
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| CONACYT |
| National Aeronautics and Space Administration |
| UNAM PAPIIT |
| CONACyT scholarship |
| ANID - Millennium Science Initiative Program |
| Agradecimiento |
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| We thank the anonymous referee for her/his useful comments which greatly improved this paper. This research has made use of the NASA/IPAC Extragalactic Data base (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of data and/or software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. NOC would like to thank CONACyT scholarship No. 897887. CVC acknowledges support from CONACyT. We thank the UNAM PAPIIT project IN105720 (PI OGM). LHG acknowledges funds by ANID - Millennium Science Initiative Program - ICN12_009 awarded to the Millennium Institute of Astrophysics (MAS). |