%0 Journal Article
%T Determination of the Point-spread Function for the Fermi Large Area Telescope from On-orbit Data and Limits on Pair Halos of Active Galactic Nuclei
%+ Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
%+ Laboratoire Leprince-Ringuet (LLR)
%+ Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO)
%+ Istituto Nazionale di Fisica Nucleare, sezione di Bari (INFN, sezione di Bari)
%+ GLAST
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%A Ackermann, Markus
%A Ajello, Marco
%A Allafort, A.
%A Asano, K.
%A Atwood, W.B.
%A Baldini, Luca
%A Ballet, Jean
%A Barbiellini, Guido
%A Bastieri, D.
%A Bechtol, K.
%A Bellazzini, R.
%A Bloom, E.D.
%A Bonamente, E.
%A Borgland, A.W.
%A Bottacini, E.
%A Brandt, T.J.
%A Bregeon, J.
%A Brigida, M.
%A Bruel, Pascal
%A Buehler, R.
%A Burnett, T.H.
%A Busetto, G.
%A Buson, S.
%A Caliandro, G.A.
%A Cameron, R.A.
%A Caraveo, P. A.
%A Casandjian, J.M.
%A Cecchi, C.
%A Charles, E.
%A Chaty, S.
%A Chekhtman, A.
%A Cheung, C.C.
%A Chiang, J.
%A Cillis, A.N.
%A Ciprini, S.
%A Claus, R.
%A Cohen-Tanugi, J.
%A Colafrancesco, S.
%A Conrad, J.
%A Cutini, S.
%A d'Ammando, F.
%A de Palma, F.
%A Dermer, C.D.
%A Silva, E.D.E.
%A Couto, Do
%A Drell, S.
%A Drlica-Wagner, A.
%A Dubois, R.
%A Favuzzi, C.
%A Fegan, S.J.
%A Ferrara, E.C.
%A Focke, W.B.
%A Fukazawa, Y.
%A Funk, S.
%A Fusco, P.
%A Gargano, F.
%A Gasparrini, D.
%A Gehrels, N.
%A Germani, S.
%A Giglietto, N.
%A Giordano, F.
%A Giroletti, M.
%A Glanzman, T.
%A Godfrey, G.
%A Grandi, P.
%A Grenier, I.A.
%A Grove, J.E.
%A Guiriec, S.
%A Hadasch, D.
%A Hayashida, M.
%A Hays, E.
%A Horan, D.
%A Hou, X.
%A Hughes, R.E.
%A Jackson, M.S.
%A Jogler, T.
%A Jóhannesson, G.
%A Johnson, R.P.
%A Johnson, A.S.
%A Kamae, T.
%A Kataoka, J.
%A Kerr, M.
%A Knödlseder, Jürgen
%A Kuss, M.
%A Lande, J.
%A Larsson, S.
%A Latronico, L.
%A Lavalley, C.
%A Lee, S.H.
%A Longo, F.
%A Loparco, F.
%A Lott, B.
%A Lovellette, M.N.
%A Lubrano, P.
%A Mazziotta, M.N.
%A Mcconville, W.
%A Mcenery, J.E.
%A Mehault, J.
%A Michelson, P.F.
%A Mignani, R.P.
%A Mitthumsiri, W.
%A Mizuno, T.
%A Moiseev, A.A.
%A Monte, C.
%A Monzani, M.E.
%A Morselli, A.
%A Moskalenko, I.V.
%A Murgia, S.
%A Naumann-Godo, M.
%A Nemmen, R.
%A Nishino, S.
%A Norris, J.P.
%A Nuss, E.
%A Ohsugi, T.
%A Omodei, N.
%A Orienti, M.
%A Orlando, E.
%A Ormes, J.F.
%A Paneque, D.
%A Panetta, J.H.
%A Pelassa, V.
%A Perkins, J.S.
%A Pesce-Rollins, M.
%A Pierbattista, M.
%A Piron, F.
%A Pivato, G.
%A Poon, H.
%A Porter, T.A.
%A Rainò, S.
%A Rando, R.
%A Razzano, M.
%A Razzaque, S.
%A Reimer, A.
%A Reimer, O.
%A Reyes, L.C.
%A Ritz, S.
%A Rochester, L.S.
%A Romoli, C.
%A Roth, M.
%A Sanchez, D.A.
%A Saz Parkinson, P.M.
%A Scargle, J.D.
%A Sgrò, C.
%A Siskind, E.J.
%A Snyder, A.
%A Spandre, G.
%A Spinelli, P.
%A Stephens, T.E.
%A Suson, D.J.
%A Tajima, H.
%A Takahashi, H.
%A Tanaka, T.
%A Thayer, J.G.
%A Thompson, D.J.
%A Tibaldo, L.
%A Tibolla, O.
%A Tinivella, M.
%A Tosti, G.
%A Troja, E.
%A Usher, T.L.
%A Vandenbroucke, J.
%A Vasileiou, V.
%A Vianello, G.
%A Vitale, V.
%A von Kienlin, A.
%A Waite, A.M.
%A Wallace, E.
%A Weltevrede, P.
%A Winer, B.L.
%A Wood, K.S.
%A Wood, M.
%A Zimmer, S.
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 765
%P 54
%8 2013
%D 2013
%Z 1309.5416
%R 10.1088/0004-637X/765/1/54
%K galaxies: active
%K galaxies: halos
%K gamma rays: galaxies
%K instrumentation: detectors
%K intergalactic medium
%Z Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Journal articles
%X The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to detect photons with energies from ≈20 MeV to >300 GeV. The pre-launch response functions of the LAT were determined through extensive Monte Carlo simulations and beam tests. The point-spread function (PSF) characterizing the angular distribution of reconstructed photons as a function of energy and geometry in the detector is determined here from two years of on-orbit data by examining the distributions of γ rays from pulsars and active galactic nuclei (AGNs). Above 3 GeV, the PSF is found to be broader than the pre-launch PSF. We checked for dependence of the PSF on the class of γ-ray source and observation epoch and found none. We also investigated several possible spatial models for pair-halo emission around BL Lac AGNs. We found no evidence for a component with spatial extension larger than the PSF and set upper limits on the amplitude of halo emission in stacked images of low- and high-redshift BL Lac AGNs and the TeV blazars 1ES0229+200 and 1ES0347-121.
%G English
%L in2p3-00823282
%U https://hal.in2p3.fr/in2p3-00823282
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%~ UNIV-PARIS7
%~ X
%~ CENBG
%~ LLR
%~ CNRS
%~ UNIV-MONTP2
%~ X-LLR
%~ X-DEP
%~ X-DEP-PHYS
%~ LUPM
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%~ IRFU-AIM
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