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A search for γ-ray emission from a sample of local universe low-frequency selected radio galaxies

Harvey, Max; Rulten, Cameron B; Chadwick, Paula M

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Authors

Max Harvey max.harvey@durham.ac.uk
PGR Student Doctor of Philosophy



Abstract

Radio galaxies are uncommon γ-ray emitters, and only low redshift radio galaxies are detected with Fermi-LAT. However, they offer potential insights into the emission mechanisms of active galaxies, particularly as the alignment of their jets with respect to the Earth means that, unlike blazars, their emission is not necessarily jet-dominated. We use Fermi-LAT data to perform an unbiased survey of 78 radio galaxies from the Bologna Complete Sample in order to search for new γ-ray-emitting radio galaxies. We observe statistically significant γ-ray emission from 4 of the 6 known Fermi-LAT detected radio galaxies included in this sample, and find some evidence for γ-ray emission spatially coincident with 4 previously undetected radio galaxies. As a large parameter space is searched, we calculate a probability distribution to compute the look-elsewhere effect. We find that these 4 spatially coincident sub-threshold γ-ray excesses are most likely a chance association, and are unlikely to be emission from the radio galaxies. Upper limits on flux are calculated for the radio galaxies from which no γ-ray emission is observed.

Citation

Harvey, M., Rulten, C. B., & Chadwick, P. M. (2020). A search for γ-ray emission from a sample of local universe low-frequency selected radio galaxies. Monthly Notices of the Royal Astronomical Society, 496(1), 903-912. https://doi.org/10.1093/mnras/staa1593

Journal Article Type Article
Acceptance Date Jun 1, 2020
Online Publication Date Jun 9, 2020
Publication Date 2020-07
Deposit Date Jun 9, 2020
Publicly Available Date May 26, 2021
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 496
Issue 1
Pages 903-912
DOI https://doi.org/10.1093/mnras/staa1593
Related Public URLs https://arxiv.org/abs/2006.02831

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.







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