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,
GeV gamma-ray emission from two gamma-ray binary candidates, HESS J0632+057 and AGL J2241+4454, which were recently reported by H.E.S.S. and AGILE, respectively, have been searched for using the Fermi-LAT archival dataset. Spatial and temporal distri
bution of gamma-ray events are studied, but there was no evidence for GeV gamma-ray signal from either sources.
A new calculation of nuclear enhancement factor, used in estimation of Galactic diffuse gamma-ray flux from proton-proton interaction in order to take account of heavy nuclei included in cosmic-rays and interstellar matter, is presented by use of a M
onte Carlo simulator, DPMJET-3. A new value of 1.8-2.0 in the energy range of 6-1000 GeV/nucleon, slightly increasing with kinetic energy of projectile cosmic rays, is about 20% larger than previous estimates.
