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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gamma-ray observations of low-luminosity active galactic nuclei

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de Menezes, Raniere [1, 2] ; Nemmen, Rodrigo [1] ; Finke, Justin D. [3] ; Almeida, Ivan [1] ; Rani, Bindu [4, 5, 6, 7]
Total Authors: 5
[1] Univ Sao Paulo, Geofis & Ciencias Atmosfer, Inst Astron, Dept Astron, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Troino - Italy
[3] US Naval Res Lab, Code 7653, 4555 Overlook Ave SW, Washington, DC 20375 - USA
[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 - USA
[5] Korea Astron & Space Sci Inst, Daejeon 34055 - South Korea
[6] Southeastent Univ Res Assoc, Washington, DC 20005 - USA
[7] NASA, GSFC, Ctr Res & Explorat Space Sci & Technol, Greenbelt, MD 20771 - USA
Total Affiliations: 7
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 492, n. 3, p. 4120-4130, MAR 2020.
Web of Science Citations: 0

The majority of the activity around nearby (z approximate to 0) supermassive black holes is found in low-luminosity active galactic nuclei (LLAGN), the most of them being classified as low ionization nuclear emission regions. Although these sources are well studied from radio up to X-rays, they are poorly understood in gamma-rays. In this work, we take advantage of the all sky-surveying capabilities of the Large Area Telescope on board Fermi Gamma-ray Space Telescope to study the whole Palomar sample of LLAGN in gamma-rays. Precisely, the four radio brightest LLAGN in the sample are identified as significant gamma-ray emitters, all of which are recognized as powerful Fanaroff-Riley 1 galaxies. These results suggest that the presence of powerful radio jets is of substantial importance for observing a significant gamma-ray counterpart even if these jets are misaligned with respect to the line of sight. We also find that most of the X-ray-brightest LLAGN do not have a significant gamma-ray and strong radio emission, suggesting that the X-rays come mainly from the accretion flow in these cases. A detailed analysis of the spectral energy distributions (SEDs) of NGC 315 and NGC 4261, both detected in gamma-rays, is provided where we make a detailed comparison between the predicted hadronic gamma-ray emission from a radiatively inefficient accretion flow (RIAF) and the gamma-ray emission from a leptonic jet-dominated synchrotron self-Compton (SSC) model. Both SEDs are better described by the SSC model, while the RIAF fails to explain the gamma-ray observations. (AU)

FAPESP's process: 18/24801-6 - Multislit spectroscopy of unidentified gamma-ray sources
Grantee:Raniere Maciel de Menezes
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 19/10054-7 - Black hole winds and feedback
Grantee:Ivan Carlos de Almeida
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 17/01461-2 - The extreme universe: black holes and the Fermi telescope
Grantee:Rodrigo Nemmen da Silva
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 16/24857-6 - Winds and feedback from supermassive black holes accreting at low rates
Grantee:Ivan Carlos de Almeida
Support type: Scholarships in Brazil - Master