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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

Ackermann, M. / Ajello, M. / Allafort, A. / Asano, K. / Atwood, W.B. / Baldini, L. / Ballet, J. / Barbiellini, G. / Bastieri, D. / Bechtol, K. / Bellazzini, R. / Bloom, E.D. / Bonamente, E. / Borgland, A.W. / Bottacini, E. / Brandt, T.J. / Bregeon, J. / Brigida, M. / Bruel, P. / 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, J. / 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. - 2015
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.

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