ACKERMANN, Markus; AJELLO, Marco; ALLAFORT, A.; ASANO, K.; ATWOOD, W.B.; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; BASTIERI, D.; BECHTOL, K.; BELLAZZINI, R.; BLOOM, E.D.; BONAMENTE, E.; BORGLAND, A.W.; BOTTACINI, E.; BRANDT, T.J.; BREGEON, J.; BRIGIDA, M.; BRUEL, Pascal; BUEHLER, R.; BURNETT, T.H.; BUSETTO, G.; BUSON, S.; CALIANDRO, G.A.; CAMERON, R.A.; CARAVEO, P. A.; CASANDJIAN, J.M.; CECCHI, C.; CHARLES, E.; CHATY, S.; CHEKHTMAN, A.; CHEUNG, C.C.; CHIANG, J.; CILLIS, A.N.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; COLAFRANCESCO, S.; CONRAD, J.; CUTINI, S.; D'AMMANDO, F.; DE PALMA, F.; DERMER, C.D.; SILVA, E.D.E.; COUTO, Do; DRELL, S.; DRLICA-WAGNER, A.; DUBOIS, R.; FAVUZZI, C.; FEGAN, S.J.; FERRARA, E.C.; FOCKE, W.B.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIGLIETTO, N.; GIORDANO, F.; GIROLETTI, M.; GLANZMAN, T.; GODFREY, G.; GRANDI, P.; GRENIER, I.A.; GROVE, J.E.; GUIRIEC, S.; HADASCH, D.; HAYASHIDA, M.; HAYS, E.; HORAN, D.; HOU, X.; HUGHES, R.E.; JACKSON, M.S.; JOGLER, T.; JÓHANNESSON, G.; JOHNSON, R.P.; JOHNSON, A.S.; KAMAE, T.; KATAOKA, J.; KERR, M.; KNÖDLSEDER, Jürgen; KUSS, M.; LANDE, J.; LARSSON, S.; LATRONICO, L.; LAVALLEY, C.; LEE, S.H.; LONGO, F.; LOPARCO, F.; LOTT, B.; LOVELLETTE, M.N.; LUBRANO, P.; MAZZIOTTA, M.N.; MCCONVILLE, W.; MCENERY, J.E.; MEHAULT, J.; MICHELSON, P.F.; MIGNANI, R.P.; MITTHUMSIRI, W.; MIZUNO, T.; MOISEEV, A.A.; MONTE, C.; MONZANI, M.E.; MORSELLI, A.; MOSKALENKO, I.V.; MURGIA, S.; NAUMANN-GODO, M.; NEMMEN, R.; NISHINO, S.; NORRIS, J.P.; NUSS, E.; OHSUGI, T.; OMODEI, N.; ORIENTI, M.; ORLANDO, E.; ORMES, J.F.; PANEQUE, D.; PANETTA, J.H.; PELASSA, V.; PERKINS, J.S.; PESCE-ROLLINS, M.; PIERBATTISTA, M.; PIRON, F.; PIVATO, G.; POON, H.; PORTER, T.A.; RAINÒ, S.; RANDO, R.; RAZZANO, M.; RAZZAQUE, S.; REIMER, A.; REIMER, O.; REYES, L.C.; RITZ, S.; ROCHESTER, L.S.; ROMOLI, C.; ROTH, M.; SANCHEZ, D.A.; SAZ PARKINSON, P.M.; SCARGLE, J.D.; SGRÒ, C.; SISKIND, E.J.; SNYDER, A.; SPANDRE, G.; SPINELLI, P.; STEPHENS, T.E.; SUSON, D.J.; TAJIMA, H.; TAKAHASHI, H.; TANAKA, T.; THAYER, J.G.; THOMPSON, D.J.; TIBALDO, L.; TIBOLLA, O.; TINIVELLA, M.; TOSTI, G.; TROJA, E.; USHER, T.L.; VANDENBROUCKE, J.; VASILEIOU, V.; VIANELLO, G.; VITALE, V.; VON KIENLIN, A.; WAITE, A.M.; WALLACE, E.; WELTEVREDE, P.; WINER, B.L.; WOOD, K.S.; WOOD, M.; ZIMMER, S.

doi:10.1088/0004-637X/765/1/54

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The Astrophysical Journal. 2013, vol. 765, p. 54

American Astronomical Society

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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.< Réduire

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galaxies: active

galaxies: halos

gamma rays: galaxies

instrumentation: detectors

intergalactic medium

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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

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