Seyfert 2 galaxies in the GeV band: jets and starburst
Jean-Philippe Lenain, Claudio Ricci, Marc T\"urler, Daniela Dorner,, Roland Walter

TL;DR
This study reports the first detection of high energy gamma-ray emission from a Seyfert 2 galaxy, NGC 1068, revealing active nucleus contribution and opening new avenues for understanding gamma-ray sources.
Contribution
The paper provides the first evidence of gamma-ray emission from a Seyfert 2 galaxy, distinguishing between starburst and active nucleus contributions in high energy emission.
Findings
Detected gamma-ray excess in NGC 1068 and NGC 4945 with high significance.
NGC 4945's emission aligns with starburst activity, NGC 1068's suggests active nucleus dominance.
A leptonic model explains NGC 1068's spectral energy distribution.
Abstract
The Fermi/LAT collaboration recently reported the detection of starburt galaxies in the high energy gamma-ray domain, as well as radio-loud narrow-line Seyfert 1 objects, which were previously unusual extragalactic suspects for high energy emission. Motivated by the presence of sources close to the location of composite starburst/Seyfert 2 galaxies in the first year Fermi/LAT catalogue, we studied high energy gamma-ray emission from such objects, aiming at disentangling the emission of starburst and Seyfert activity. We analysed 1.6 years of Fermi/LAT data from NGC 1068 and NGC 4945, which count among the brightest Seyfert 2 galaxies. We found an excess of high energy gamma-rays of 8.3 sigmas and 9.2 sigmas for 1FGL J0242.7+0007 and 1FGL J1305.4-4928, which are found to be consistent with the position of the Seyfert 2 galaxies NGC 1068 and NGC 4945, respectively. While the high energy…
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Gamma-ray bursts and supernovae · Galaxies: Formation, Evolution, Phenomena
