Published in

Zenodo, 2016

DOI: 10.5281/zenodo.163821

Links

Tools

Export citation

Search in Google Scholar

The Cso Pks 1718-649 In Gamma-Rays With Fermi-Lat

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Question mark in circle
Preprint: policy unknown
Question mark in circle
Postprint: policy unknown
Question mark in circle
Published version: policy unknown

Abstract

We report the detection (> 5sigma ) with Fermi-LAT of gamma-ray emission from the nearby (z = 0.014) radio galaxy, PKS 1718‚àí649. This is the first detection in gamma-rays of a bona fide Compact Symmetric Object, a class of sources that are thought to represent the first stage in the evolution of extragalactic radio sources. A detection in the gamma-ray band is a clear indication of a non-thermal high-energy component and provides us with important insights on the physical conditions of expanding young radio sources. The symmetric radio morphology indicates that the source is seen at a large inclination angle and disfavors a contribution of the jet boosted emission. The steep gamma-ray spectrum and steady faint emission are consistent with the scenario of isotropic gamma-ray emission from the compact (<2pc) radio lobes, as proposed by models of expanding young radio sources. We discuss this interpretation and the perspectives for the detection of other young sources in gamma-rays.

Beta version