Gamma-rays from young radio galaxies and quasars

Abstract

According to radiative models, radio galaxies and quasars are predicted to produce gamma rays from the earliest stages of their evolution. Exploring their high-energy emission is crucial for providing information on the most energetic processes, the origin and the structure of the newly born radio jets. Taking advantage of more than 11 years of \textit{Fermi}-LAT data, we investigate the gamma-ray emission of 162 young radio sources (103 galaxies and 59 quasars), the largest sample of young radio sources used so far for such a gamma-ray study. We separately analyze each source and perform the first stacking analysis of this class of sources to investigate the gamma-ray emission of the undetected sources. We detect significant gamma-ray emission from 11 young radio sources, four galaxies and seven quasars, including the discovery of significant gamma-ray emission from the compact radio galaxy PKS 1007+142 (z=0.213). The cumulative signal of below-threshold young radio sources is not significantly detected. However, it is about one order of magnitude below than those derived from the individual sources, providing stringent upper limits on the gamma-ray emission from young radio galaxies ($F_{\gamma }<4.6\times 10^{-11}$ ph cm${}^{-2}$ s${}^{-1}$) and quasars ($F_{\gamma }<10.1\times 10^{-11}$ ph cm${}^{-2}$ s${}^{-1}$), and enabling a comparison with the models proposed. With this analysis of more than a decade of \textit{Fermi}-LAT observations, we can conclude that while individual young radio sources can be bright gamma-ray emitters, the collective gamma-ray emission of this class of sources is not bright enough to be detected by \textit{Fermi}-LAT.

Accepted for publication in MNRAS, 20 pages, 20 figures

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• The Origin of High Energy Emission in the Young Radio Source PKS 1718-649
• The extremely X-ray luminous radio-loud quasar CFHQS J142952+544717 at $z=6.18$ under Chandra high-angular resolution lens
• Hunting for gamma-ray emission from Fast Radio Bursts
• GeV $\gamma$-ray Emission of Compact Steep-Spectrum Source 4C +39.23B
• X-ray and GeV-gamma-ray emission property of TeV Compact Symmetric Object PKS 1413+135 and Implication for Episodic Jet Activity
• A Stacking Survey of Gamma-ray Pulsars
• Jetted subgalactic-size radio sources in merging galaxies -- A jet redirection scenario
• PKS1413+135: OH and HI at z = 0.247 with MeerKAT
• Constraints on VHE gamma-ray emission of Flat Spectrum Radio Quasars with the MAGIC telescopes
• Fermi-LAT Discovery of a Gamma-ray Outburst from the Peculiar Compact Steep Spectrum Radiogalaxy 3C 216
• The gamma-ray emission from young radio galaxies and quasars
• IGR J18249-3243: a new GeV-emitting FR II and the emerging population of high energy radio galaxies