The first γ-ray detection of the narrow-line Seyfert 1 FBQS J1644+2619

Journal
Date Issued
2015
Author(s)
•
•
Larsson, J.
•
DOI
Abstract
We report the discovery of γ-ray emission from the narrow-line Seyfert 1 (NLSy1) galaxy FBQS J1644+2619 by the Large Area Telescope on board the Fermi satellite. The Third Fermi LAT Source catalogue reports an unidentified γ-ray source, detected over the first four years of Fermi operation, 0.23° from the radio position of the NLSy1. Analysing 76 months of γ-ray data (2008 August 4-2014 December 31) we are able to better constrain the localization of the γ-ray source. The new position of the γ-ray source is 0.05° from FBQS J1644+2619, suggesting a spatial association with the NLSy1. This is the sixth NLSy1 detected at high significance by Fermi-LAT so far. Notably, a significant increase of activity was observed in γ-rays from FBQS J1644+2619 during 2012 July-October, and an increase of activity in the V band was detected by the Catalina Real-Time Sky Survey in the same period.
Volume
452
Issue
1
Start page
520
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.452..520D
Rights
open.access
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