The first γ-ray detection of the narrow-line Seyfert 1 FBQS J1644+2619
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 2015
- DOI:
- 10.1093/mnras/stv1278
- arXiv:
- arXiv:1503.08226
- Bibcode:
- 2015MNRAS.452..520D
- Keywords:
-
- galaxies: active;
- galaxies: individual: FBQS J1644+2619;
- galaxies: nuclei;
- galaxies: Seyfert;
- gamma-rays: general;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 6 pages, 2 figures. accepted for publication in Monthly Notices of the Royal Astronomical Society