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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Ackermann, M. (author)

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

Article/chapterEnglish2013

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2013
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LIBRIS-ID:oai:DiVA.org:kth-119446
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119446URI
https://doi.org/10.1088/0004-637X/765/1/54DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88705URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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QC 20130318
AuthorCount:174;
The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to detect photons with energies from approximate to 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 gamma 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 gamma-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.

Subject headings and genre

NATURVETENSKAP Fysik hsv//swe
NATURAL SCIENCES Physical Sciences hsv//eng
NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
galaxies: active
galaxies: halos
gamma rays: galaxies
instrumentation: detectors
intergalactic medium

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Ajello, M. (author)
Allafort, A. (author)
Asano, K. (author)
Atwood, W. B. (author)
Baldini, L. (author)
Ballet, J. (author)
Barbiellini, G. (author)
Bastieri, D. (author)
Bechtol, K. (author)
Bellazzini, R. (author)
Bloom, E. D. (author)
Bonamente, E. (author)
Borgland, A. W. (author)
Bottacini, E. (author)
Brandt, T. J. (author)
Bregeon, J. (author)
Brigida, M. (author)
Bruel, P. (author)
Buehler, R. (author)
Burnett, T. H. (author)
Busetto, G. (author)
Buson, S. (author)
Caliandro, G. A. (author)
Cameron, R. A. (author)
Caraveo, P. A. (author)
Casandjian, J. M. (author)
Cecchi, C. (author)
Charles, E. (author)
Chaty, S. (author)
Chekhtman, A. (author)
Cheung, C. C. (author)
Chiang, J. (author)
Cillis, A. N. (author)
Ciprini, S. (author)
Claus, R. (author)
Cohen-Tanugi, J. (author)
Colafrancesco, S. (author)
Conrad, JanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)conrad (author)
Cutini, S. (author)
D'Ammando, F. (author)
de Palma, F. (author)
Dermer, C. D. (author)
do Couto e Silva, E. (author)
Drell, S. (author)
Drlica-Wagner, A. (author)
Dubois, R. (author)
Favuzzi, C. (author)
Fegan, S. J. (author)
Ferrara, E. C. (author)
Focke, W. B. (author)
Fortin, P. (author)
Fukazawa, Y. (author)
Funk, S. (author)
Fusco, P. (author)
Gargano, F. (author)
Gasparrini, D. (author)
Gehrels, N. (author)
Germani, S. (author)
Giglietto, N. (author)
Giordano, F. (author)
Giroletti, M. (author)
Glanzman, T. (author)
Godfrey, G. (author)
Grandi, P. (author)
Grenier, I. A. (author)
Grove, J. E. (author)
Guiriec, S. (author)
Hadasch, D. (author)
Hayashida, M. (author)
Hays, E. (author)
Horan, D. (author)
Hou, X. (author)
Hughes, R. E. (author)
Jackson, Miranda S.KTH,Partikel- och astropartikelfysik(Swepub:kth)u1k3ikhm (author)
Jogler, T. (author)
Johannesson, G. (author)
Johnson, R. P. (author)
Johnson, A. S. (author)
Kamae, T. (author)
Kataoka, J. (author)
Kerr, M. (author)
Knoedlseder, J. (author)
Kuss, M. (author)
Lande, J. (author)
Larsson, StefanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Institutionen för astronomi(Swepub:su)slars (author)
Latronico, L. (author)
Lavalley, C. (author)
Lee, S. -H (author)
Longo, F. (author)
Loparco, F. (author)
Lott, B. (author)
Lovellette, M. N. (author)
Lubrano, P. (author)
Mazziotta, M. N. (author)
McConville, W. (author)
McEnery, J. E. (author)
Mehault, J. (author)
Michelson, P. F. (author)
Mignani, R. P. (author)
Mitthumsiri, W. (author)
Mizuno, T. (author)
Moiseev, A. A. (author)
Monte, C. (author)
Monzani, M. E. (author)
Morselli, A. (author)
Moskalenko, I. V. (author)
Murgia, S. (author)
Naumann-Godo, M. (author)
Nemmen, R. (author)
Nishino, S. (author)
Norris, J. P. (author)
Nuss, E. (author)
Ohsugi, T. (author)
Omodei, N. (author)
Orienti, M. (author)
Orlando, E. (author)
Ormes, J. F. (author)
Paneque, D. (author)
Panetta, J. H. (author)
Pelassa, V. (author)
Perkins, J. S. (author)
Pesce-Rollins, M. (author)
Pierbattista, M. (author)
Piron, F. (author)
Pivato, G. (author)
Poon, H. (author)
Porter, T. A. (author)
Raino, S. (author)
Rando, R. (author)
Razzano, M. (author)
Razzaque, S. (author)
Reimer, A. (author)
Reimer, O. (author)
Reyes, L. C. (author)
Ritz, S. (author)
Rochester, L. S. (author)
Romoli, C. (author)
Roth, M. (author)
Sanchez, D. A. (author)
Parkinson, P. M. Saz (author)
Scargle, J. D. (author)
Sgro, C. (author)
Siskind, E. J. (author)
Snyder, A. (author)
Spandre, G. (author)
Spinelli, P. (author)
Stephens, T. E. (author)
Suson, D. J. (author)
Tajima, H. (author)
Takahashi, H. (author)
Tanaka, T. (author)
Thayer, J. G. (author)
Thayer, J. B. (author)
Thompson, D. J. (author)
Tibaldo, L. (author)
Tibolla, O. (author)
Tinivella, M. (author)
Tosti, G. (author)
Troja, E. (author)
Usher, T. L. (author)
Vandenbroucke, J. (author)
Vasileiou, V. (author)
Vianello, G. (author)
Vitale, V. (author)
von Kienlin, A. (author)
Waite, A. P. (author)
Wallace, E. (author)
Weltevrede, P. (author)
Winer, B. L. (author)
Wood, K. S. (author)
Wood, M. (author)
Yang, ZhaoyuStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Elementarpartikelfysik(Swepub:su)zhaoyu (author)
Zimmer, StephanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)stzi0820 (author)
Stockholms universitetFysikum (creator_code:org_t)

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In:Astrophysical Journal765:1, s. 54-0004-637X1538-4357

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By the author/editor: Ackermann, M.; Ajello, M.; Allafort, A.; Asano, K.; Atwood, W. B.; Baldini, L.; show more...; 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, Jan; Cutini, S.; D'Ammando, F.; de Palma, F.; Dermer, C. D.; do Couto e Silva ...; Drell, S.; Drlica-Wagner, A ...; Dubois, R.; Favuzzi, C.; Fegan, S. J.; Ferrara, E. C.; Focke, W. B.; Fortin, P.; 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, Miranda ...; Jogler, T.; Johannesson, G.; Johnson, R. P.; Johnson, A. S.; Kamae, T.; Kataoka, J.; Kerr, M.; Knoedlseder, J.; Kuss, M.; Lande, J.; Larsson, Stefan; 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.; Raino, 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.; Parkinson, P. M. ...; Scargle, J. D.; Sgro, 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.; Thayer, J. B.; 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. P.; Wallace, E.; Weltevrede, P.; Winer, B. L.; Wood, K. S.; Wood, M.; Yang, Zhaoyu; Zimmer, Stephan; show less...

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