Advanced search
Start date
Betweenand
Related content
(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

Full text
Author(s):
de Menezes, Raniere [1, 2] ; Nemmen, Rodrigo [1] ; Finke, Justin D. [3] ; Almeida, Ivan [1] ; Rani, Bindu [4, 5, 6, 7]
Total Authors: 5
Affiliation:
[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
Abstract

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