Joshua Lande, Markus Ackermann, Alice Allafort, Jean Ballet, Keith Bechtol, Toby Burnett, Johann Cohen-Tanugi, Alex Drlica-Wagner, Stefan Funk, Francesco Giordano, Marie-Helene Grondin, Matthew Kerr, Marianne Lemoine-Goumard
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.
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http://arxiv.org/abs/1207.0027
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