Discovery of gamma-ray emission from a strongly lobe-dominated quasar 3C 275.1

Abstract

We systematically analyze the 6-year {\it Fermi}/LAT data of the lobe-dominated quasars (LDQs) in the complete LDQ sample from 3CRR survey and report the discovery of high-energy $\gamma$-ray emission from 3C 275.1. The $\gamma$-ray emission of 3C 207 is confirmed and significant variability of the lightcurve is identified. We do not find statistically significant $\gamma$-ray emission from other LDQs. 3C 275.1 is the known $\gamma$-ray quasar with the lowest core dominance parameter (i.e., $R=0.11$). We also show that both the northern radio hotspot and parsec jet models can reasonably reproduce the $\gamma$-ray data. The parsec jet model, however, is favored by the potential $\gamma$-ray variability at the timescale of months. We suggest that some dimmer $\gamma$-ray LDQs will be detected in the future and LDQs could contribute non-negligibly to the extragalactic $\gamma$-ray background.

26 pages, 10 figures, 3 tables; ApJ in press

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• Roma-BZCAT: A multifrequency catalogue of Blazars
• Fermi Gamma-ray Imaging of a Radio Galaxy
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• Multi-wavelength variability properties of Fermi blazar S5 0716+714
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Cited by in corpus (6)

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• Radio Galaxies Dominate the High-Energy Diffuse Gamma-Ray Background
• Examining High Energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets
• Discovery of $\gamma$-ray emission from the radio-intermediate quasar III Zw 2: violent jet activity with intraday $\gamma$-ray variability
• Effect of spectral index distribution on estimating the AGN radio luminosity function
• Fermi/LAT observations of Lobe-dominant Radio Galaxy 3C 207 and Possible Radiation Region of the Gamma-Rays