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Title: Gamma-ray observations of low-luminosity active galactic nuclei

Abstract

ABSTRACT The majority of the activity around nearby (z ≈ 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 γ-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 γ-rays. Precisely, the four radio-brightest LLAGN in the sample are identified as significant γ-ray emitters, all of which are recognized as powerful Fanaroff–Riley I galaxies. These results suggest that the presence of powerful radio jets is of substantial importance for observing a significant γ-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 γ-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 γ-rays, is provided where we make a detailed comparison between the predicted hadronicmore » γ-ray emission from a radiatively inefficient accretion flow (RIAF) and the γ-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 γ-ray observations.« less

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [2];  [4]
  1. Departamento de Astronomia, Instituto de Astronomia, Universidade de São Paulo,Geofísica e Ciências Atmosféricas, São Paulo, SP 05508-090, Brazil, Dipartimento di Fisica, Università degli Studi di Torino, via Pietro Giuria 1, I-10125 Torino, Italy
  2. Departamento de Astronomia, Instituto de Astronomia, Universidade de São Paulo,Geofísica e Ciências Atmosféricas, São Paulo, SP 05508-090, Brazil
  3. U.S. Naval Research Laboratory, Code 7653, 4555 Overlook Ave. SW, Washington, DC, 20375-5352, USA
  4. Southeastern Universities Research Association, Washington, DC 20005, USA, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA, Center for Research and Exploration in Space Sciences and Technology, NASA/GSFC, Greenbelt, MD 20771, USA, Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1595848
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 492 Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

de Menezes, Raniere, Nemmen, Rodrigo, Finke, Justin D., Almeida, Ivan, and Rani, Bindu. Gamma-ray observations of low-luminosity active galactic nuclei. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa083.
de Menezes, Raniere, Nemmen, Rodrigo, Finke, Justin D., Almeida, Ivan, & Rani, Bindu. Gamma-ray observations of low-luminosity active galactic nuclei. United Kingdom. doi:10.1093/mnras/staa083.
de Menezes, Raniere, Nemmen, Rodrigo, Finke, Justin D., Almeida, Ivan, and Rani, Bindu. Thu . "Gamma-ray observations of low-luminosity active galactic nuclei". United Kingdom. doi:10.1093/mnras/staa083.
@article{osti_1595848,
title = {Gamma-ray observations of low-luminosity active galactic nuclei},
author = {de Menezes, Raniere and Nemmen, Rodrigo and Finke, Justin D. and Almeida, Ivan and Rani, Bindu},
abstractNote = {ABSTRACT The majority of the activity around nearby (z ≈ 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 γ-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 γ-rays. Precisely, the four radio-brightest LLAGN in the sample are identified as significant γ-ray emitters, all of which are recognized as powerful Fanaroff–Riley I galaxies. These results suggest that the presence of powerful radio jets is of substantial importance for observing a significant γ-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 γ-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 γ-rays, is provided where we make a detailed comparison between the predicted hadronic γ-ray emission from a radiatively inefficient accretion flow (RIAF) and the γ-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 γ-ray observations.},
doi = {10.1093/mnras/staa083},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 492,
place = {United Kingdom},
year = {2020},
month = {1}
}

Journal Article:
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DOI: 10.1093/mnras/staa083

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