Fermi LAT detection of two high Galactic latitude gamma-ray sources, Fermi J1049.7+0435 and J1103.2+1145

Abstract

During a search for gamma-ray emission from NGC 3628 (Arp 317), two new unidentified gamma-ray sources, Fermi J1049.7+0435 and J1103.2+1145 have been discovered \cite{ATel}. The detections are made in data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope, in the 100\,MeV to 300\,GeV band during the period between 2008 August 5 and 2012 October 27. Neither is coincident with any source listed in the 2FGL catalogue \cite{Nolan2012}. Fermi J1049.7+0435 is at Galactic coordinates $(l,b) = (245.34^\circ, 53.27^\circ)$, $(\alpha_{J2000}, \delta_{J2000}) = (162.43^\circ, 4.60^\circ)$. Fermi J1103.2+1145 is at Galactic coordinates $(l,b) = (238.85^\circ, 60.33^\circ)$, $(\alpha_{J2000},\delta_{J2000})= (165.81^\circ, 11.75^\circ)$. Possible radio counterparts are found for both sources, which show flat radio spectra similar to other Fermi LAT detected AGN, and their identifications are discussed. These identification have been supoorted by snap-shot observations with the Australia Telescope Compact Array at several epochs in 2013 and 2014,