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Search for Spatially Extended Fermi-LAT Sources Using Two Years of Data

Spatial extension is an important characteristic for correctly associating gamma-ray-emitting sources with their counterparts at other wavelengths and for obtaining an unbiased model of their spectra. We present a new method for quantifying the spatial extension of sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi). We perform a series of Monte Carlo simulations to validate this tool and calculate the LAT threshold for detecting the spatial extension of sources. We then test all sources in the second Fermi-LAT catalog (2FGL) for extension. We report the detection of seven new spatially extended sources.

preprint2012arXivOpen access
Joshua LandeMarkus AckermannAlice AllafortJean BalletKeith BechtolToby BurnettJohann Cohen-TanugiAlex Drlica-WagnerStefan FunkFrancesco GiordanoMarie-Helene GrondinMatthew KerrMarianne Lemoine-Goumard
astro-ph.HE
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Open access13 authors1 topic
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Joshua LandeMarkus AckermannAlice AllafortJean BalletKeith BechtolToby BurnettJohann Cohen-TanugiAlex Drlica-WagnerStefan FunkFrancesco GiordanoMarie-Helene GrondinMatthew KerrMarianne Lemoine-Goumard

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