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The first gamma-ray detection of the narrow-line Seyfert 1 FBQS J1644+2619
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 4
2015 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 452, no 1, 520-524 p.Article in journal (Refereed) Published
Abstract [en]

We report the discovery of gamma-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 gamma-ray source, detected over the first four years of Fermi operation, 0 degrees.23 from the radio position of the NLSy1. Analysing 76 months of gamma-ray data (2008 August 4-2014 December 31) we are able to better constrain the localization of the gamma-ray source. The new position of the gamma-ray source is 0 degrees.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 gamma-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.

Place, publisher, year, edition, pages
2015. Vol. 452, no 1, 520-524 p.
Keyword [en]
galaxies: active, galaxies: individual: FBQS J1644+2619, galaxies: nuclei, galaxies: Seyfert, gamma-rays: general
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-121672DOI: 10.1093/mnras/stv1278ISI: 000360851100038OAI: diva2:889957
Available from: 2015-12-29 Created: 2015-10-13 Last updated: 2015-12-29Bibliographically approved

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