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

Harvey, Max and Rulten, Cameron B. and Chadwick, Paula 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). pp. 903-912.


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.

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Publisher 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.
Date accepted:01 June 2020
Date deposited:26 May 2021
Date of first online publication:09 June 2020
Date first made open access:26 May 2021

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