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

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 po...

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Main Authors:	Ackermann, M., Ajello, M., Allafort, A., Asano, K., Atwood, W., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Bloom, E., Bonamente, E., Borgland, A., Bottacini, E., Brandt, T., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Burnett, T., Busetto, G., Buson, S., Caliandro, G., Cameron, R., Caraveo, P., Casandjian, J., Cecchi, C., Charles, E., Chaty, S., Chekhtman, A., Cheung, C., Chiang, J., Cillis, A., Ciprini, S., Claus, R., Cohen-Tanugi, J., Colafrancesco, S., Conrad, J., Cutini, S., D’Ammando, F., de Palma, F., Dermer, C., Do Couto e Silva, E., Drell, P., Drlica-Wagner, A., Dubois, R., Favuzzi, C., Fegan, S., Ferrara, E., Focke, W., 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., Grove, J., Guiriec, S., Hadasch, D., Hayashida, M., Hays, E., Horan, D., Hou, X., Hughes, R., Jackson, M., Jogler, T., Johannesson, G., Johnson, R., Johnson, A., Kamae, T., Kataoka, J., Kerr, M., Knodlseder, J., Kuss, M., Lande, J., Larsson, S., Latronico, L., Lavalley, C., Lee, S., Longo, F., Loparco, F., Lott, B., Lovellette, M., Lubrano, P., Mazziotta, M., McConville, W., McEnery, J., Mehault, J., Michelson, P., Mignani, R., Mitthumsiri, W., Mizuno, T., Moiseev, A., Monte, C., Monzani, M., Morselli, A., Moskalenko, I., Murgia, S., Naumann-Godo, M., Nemmen, R., Nishino, S., Norris, J., Nuss, E., Ohsugi, T., Omodei, N., Orienti, M., Orlando, E., Ormes, J., Paneque, D., Panetta, J., Pelassa, V., Perkins, J., Pesce-Rollins, M., Pierbattista, M., Piron, F., Pivato, G., Poon, H., Porter, T., Raino, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reyes, L., Ritz, S., Rochester, L., Romoli, C., Roth, M., Sanchez, D., Saz Parkinson, P., Scargle, J., Sgro, C., Siskind, E., Snyder, A., Spandre, G., Spinelli, P., Stephens, T., Suson, D., Tajima, H., Takahashi, H., Tanaka, H., Thayer, J., Thompson, D., Tibaldo, L., Tibolla, Omar, Tinivella, M., Tosti, G., Troja, E., Usher, T., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., von Kienlin, A., Waite, A., Wallace, E., Weltevrede, P., Winer, B., Wood, K., Wood, M., Yang, Z., Zimmer, S.
Format:	Journal Article
Published:	Institute of Physics Publishing 2013
Subjects:	galaxies: halos gamma rays: galaxies galaxies: active intergalactic medium instrumentation: detectors
Online Access:	http://hdl.handle.net/20.500.11937/16589

_version_	1848749220110008320
author	Ackermann, M. Ajello, M. Allafort, A. Asano, K. Atwood, W. Baldini, L. Ballet, J. Barbiellini, G. Bastieri, D. Bechtol, K. Bellazzini, R. Bloom, E. Bonamente, E. Borgland, A. Bottacini, E. Brandt, T. Bregeon, J. Brigida, M. Bruel, P. Buehler, R. Burnett, T. Busetto, G. Buson, S. Caliandro, G. Cameron, R. Caraveo, P. Casandjian, J. Cecchi, C. Charles, E. Chaty, S. Chekhtman, A. Cheung, C. Chiang, J. Cillis, A. Ciprini, S. Claus, R. Cohen-Tanugi, J. Colafrancesco, S. Conrad, J. Cutini, S. D’Ammando, F. de Palma, F. Dermer, C. Do Couto e Silva, E. Drell, P. Drlica-Wagner, A. Dubois, R. Favuzzi, C. Fegan, S. Ferrara, E. Focke, W. 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. Grove, J. Guiriec, S. Hadasch, D. Hayashida, M. Hays, E. Horan, D. Hou, X. Hughes, R. Jackson, M. Jogler, T. Johannesson, G. Johnson, R. Johnson, A. Kamae, T. Kataoka, J. Kerr, M. Knodlseder, J. Kuss, M. Lande, J. Larsson, S. Latronico, L. Lavalley, C. Lee, S. Longo, F. Loparco, F. Lott, B. Lovellette, M. Lubrano, P. Mazziotta, M. McConville, W. McEnery, J. Mehault, J. Michelson, P. Mignani, R. Mitthumsiri, W. Mizuno, T. Moiseev, A. Monte, C. Monzani, M. Morselli, A. Moskalenko, I. Murgia, S. Naumann-Godo, M. Nemmen, R. Nishino, S. Norris, J. Nuss, E. Ohsugi, T. Omodei, N. Orienti, M. Orlando, E. Ormes, J. Paneque, D. Panetta, J. Pelassa, V. Perkins, J. Pesce-Rollins, M. Pierbattista, M. Piron, F. Pivato, G. Poon, H. Porter, T. Raino, S. Rando, R. Razzano, M. Razzaque, S. Reimer, A. Reimer, O. Reyes, L. Ritz, S. Rochester, L. Romoli, C. Roth, M. Sanchez, D. Saz Parkinson, P. Scargle, J. Sgro, C. Siskind, E. Snyder, A. Spandre, G. Spinelli, P. Stephens, T. Suson, D. Tajima, H. Takahashi, H. Tanaka, H. Thayer, J. Thayer, J. Thompson, D. Tibaldo, L. Tibolla, Omar Tinivella, M. Tosti, G. Troja, E. Usher, T. Vandenbroucke, J. Vasileiou, V. Vianello, G. Vitale, V. von Kienlin, A. Waite, A. Wallace, E. Weltevrede, P. Winer, B. Wood, K. Wood, M. Yang, Z. Zimmer, S.
author_facet	Ackermann, M. Ajello, M. Allafort, A. Asano, K. Atwood, W. Baldini, L. Ballet, J. Barbiellini, G. Bastieri, D. Bechtol, K. Bellazzini, R. Bloom, E. Bonamente, E. Borgland, A. Bottacini, E. Brandt, T. Bregeon, J. Brigida, M. Bruel, P. Buehler, R. Burnett, T. Busetto, G. Buson, S. Caliandro, G. Cameron, R. Caraveo, P. Casandjian, J. Cecchi, C. Charles, E. Chaty, S. Chekhtman, A. Cheung, C. Chiang, J. Cillis, A. Ciprini, S. Claus, R. Cohen-Tanugi, J. Colafrancesco, S. Conrad, J. Cutini, S. D’Ammando, F. de Palma, F. Dermer, C. Do Couto e Silva, E. Drell, P. Drlica-Wagner, A. Dubois, R. Favuzzi, C. Fegan, S. Ferrara, E. Focke, W. 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. Grove, J. Guiriec, S. Hadasch, D. Hayashida, M. Hays, E. Horan, D. Hou, X. Hughes, R. Jackson, M. Jogler, T. Johannesson, G. Johnson, R. Johnson, A. Kamae, T. Kataoka, J. Kerr, M. Knodlseder, J. Kuss, M. Lande, J. Larsson, S. Latronico, L. Lavalley, C. Lee, S. Longo, F. Loparco, F. Lott, B. Lovellette, M. Lubrano, P. Mazziotta, M. McConville, W. McEnery, J. Mehault, J. Michelson, P. Mignani, R. Mitthumsiri, W. Mizuno, T. Moiseev, A. Monte, C. Monzani, M. Morselli, A. Moskalenko, I. Murgia, S. Naumann-Godo, M. Nemmen, R. Nishino, S. Norris, J. Nuss, E. Ohsugi, T. Omodei, N. Orienti, M. Orlando, E. Ormes, J. Paneque, D. Panetta, J. Pelassa, V. Perkins, J. Pesce-Rollins, M. Pierbattista, M. Piron, F. Pivato, G. Poon, H. Porter, T. Raino, S. Rando, R. Razzano, M. Razzaque, S. Reimer, A. Reimer, O. Reyes, L. Ritz, S. Rochester, L. Romoli, C. Roth, M. Sanchez, D. Saz Parkinson, P. Scargle, J. Sgro, C. Siskind, E. Snyder, A. Spandre, G. Spinelli, P. Stephens, T. Suson, D. Tajima, H. Takahashi, H. Tanaka, H. Thayer, J. Thayer, J. Thompson, D. Tibaldo, L. Tibolla, Omar Tinivella, M. Tosti, G. Troja, E. Usher, T. Vandenbroucke, J. Vasileiou, V. Vianello, G. Vitale, V. von Kienlin, A. Waite, A. Wallace, E. Weltevrede, P. Winer, B. Wood, K. Wood, M. Yang, Z. Zimmer, S.
author_sort	Ackermann, M.
building	Curtin Institutional Repository
collection	Online Access
description	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 thedetector is determined here from two years of on-orbit data by examining the distributions of ? 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 ? -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.
first_indexed	2025-11-14T07:17:28Z
format	Journal Article
id	curtin-20.500.11937-16589
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T07:17:28Z
publishDate	2013
publisher	Institute of Physics Publishing
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-165892017-09-13T15:42:43Z 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. Baldini, L. Ballet, J. Barbiellini, G. Bastieri, D. Bechtol, K. Bellazzini, R. Bloom, E. Bonamente, E. Borgland, A. Bottacini, E. Brandt, T. Bregeon, J. Brigida, M. Bruel, P. Buehler, R. Burnett, T. Busetto, G. Buson, S. Caliandro, G. Cameron, R. Caraveo, P. Casandjian, J. Cecchi, C. Charles, E. Chaty, S. Chekhtman, A. Cheung, C. Chiang, J. Cillis, A. Ciprini, S. Claus, R. Cohen-Tanugi, J. Colafrancesco, S. Conrad, J. Cutini, S. D’Ammando, F. de Palma, F. Dermer, C. Do Couto e Silva, E. Drell, P. Drlica-Wagner, A. Dubois, R. Favuzzi, C. Fegan, S. Ferrara, E. Focke, W. 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. Grove, J. Guiriec, S. Hadasch, D. Hayashida, M. Hays, E. Horan, D. Hou, X. Hughes, R. Jackson, M. Jogler, T. Johannesson, G. Johnson, R. Johnson, A. Kamae, T. Kataoka, J. Kerr, M. Knodlseder, J. Kuss, M. Lande, J. Larsson, S. Latronico, L. Lavalley, C. Lee, S. Longo, F. Loparco, F. Lott, B. Lovellette, M. Lubrano, P. Mazziotta, M. McConville, W. McEnery, J. Mehault, J. Michelson, P. Mignani, R. Mitthumsiri, W. Mizuno, T. Moiseev, A. Monte, C. Monzani, M. Morselli, A. Moskalenko, I. Murgia, S. Naumann-Godo, M. Nemmen, R. Nishino, S. Norris, J. Nuss, E. Ohsugi, T. Omodei, N. Orienti, M. Orlando, E. Ormes, J. Paneque, D. Panetta, J. Pelassa, V. Perkins, J. Pesce-Rollins, M. Pierbattista, M. Piron, F. Pivato, G. Poon, H. Porter, T. Raino, S. Rando, R. Razzano, M. Razzaque, S. Reimer, A. Reimer, O. Reyes, L. Ritz, S. Rochester, L. Romoli, C. Roth, M. Sanchez, D. Saz Parkinson, P. Scargle, J. Sgro, C. Siskind, E. Snyder, A. Spandre, G. Spinelli, P. Stephens, T. Suson, D. Tajima, H. Takahashi, H. Tanaka, H. Thayer, J. Thayer, J. Thompson, D. Tibaldo, L. Tibolla, Omar Tinivella, M. Tosti, G. Troja, E. Usher, T. Vandenbroucke, J. Vasileiou, V. Vianello, G. Vitale, V. von Kienlin, A. Waite, A. Wallace, E. Weltevrede, P. Winer, B. Wood, K. Wood, M. Yang, Z. Zimmer, S. galaxies: halos gamma rays: galaxies galaxies: active intergalactic medium instrumentation: detectors 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 thedetector is determined here from two years of on-orbit data by examining the distributions of ? 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 ? -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. 2013 Journal Article http://hdl.handle.net/20.500.11937/16589 10.1088/0004-637X/765/1/54 Institute of Physics Publishing unknown
spellingShingle	galaxies: halos gamma rays: galaxies galaxies: active intergalactic medium instrumentation: detectors Ackermann, M. Ajello, M. Allafort, A. Asano, K. Atwood, W. Baldini, L. Ballet, J. Barbiellini, G. Bastieri, D. Bechtol, K. Bellazzini, R. Bloom, E. Bonamente, E. Borgland, A. Bottacini, E. Brandt, T. Bregeon, J. Brigida, M. Bruel, P. Buehler, R. Burnett, T. Busetto, G. Buson, S. Caliandro, G. Cameron, R. Caraveo, P. Casandjian, J. Cecchi, C. Charles, E. Chaty, S. Chekhtman, A. Cheung, C. Chiang, J. Cillis, A. Ciprini, S. Claus, R. Cohen-Tanugi, J. Colafrancesco, S. Conrad, J. Cutini, S. D’Ammando, F. de Palma, F. Dermer, C. Do Couto e Silva, E. Drell, P. Drlica-Wagner, A. Dubois, R. Favuzzi, C. Fegan, S. Ferrara, E. Focke, W. 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. Grove, J. Guiriec, S. Hadasch, D. Hayashida, M. Hays, E. Horan, D. Hou, X. Hughes, R. Jackson, M. Jogler, T. Johannesson, G. Johnson, R. Johnson, A. Kamae, T. Kataoka, J. Kerr, M. Knodlseder, J. Kuss, M. Lande, J. Larsson, S. Latronico, L. Lavalley, C. Lee, S. Longo, F. Loparco, F. Lott, B. Lovellette, M. Lubrano, P. Mazziotta, M. McConville, W. McEnery, J. Mehault, J. Michelson, P. Mignani, R. Mitthumsiri, W. Mizuno, T. Moiseev, A. Monte, C. Monzani, M. Morselli, A. Moskalenko, I. Murgia, S. Naumann-Godo, M. Nemmen, R. Nishino, S. Norris, J. Nuss, E. Ohsugi, T. Omodei, N. Orienti, M. Orlando, E. Ormes, J. Paneque, D. Panetta, J. Pelassa, V. Perkins, J. Pesce-Rollins, M. Pierbattista, M. Piron, F. Pivato, G. Poon, H. Porter, T. Raino, S. Rando, R. Razzano, M. Razzaque, S. Reimer, A. Reimer, O. Reyes, L. Ritz, S. Rochester, L. Romoli, C. Roth, M. Sanchez, D. Saz Parkinson, P. Scargle, J. Sgro, C. Siskind, E. Snyder, A. Spandre, G. Spinelli, P. Stephens, T. Suson, D. Tajima, H. Takahashi, H. Tanaka, H. Thayer, J. Thayer, J. Thompson, D. Tibaldo, L. Tibolla, Omar Tinivella, M. Tosti, G. Troja, E. Usher, T. Vandenbroucke, J. Vasileiou, V. Vianello, G. Vitale, V. von Kienlin, A. Waite, A. Wallace, E. Weltevrede, P. Winer, B. Wood, K. Wood, M. Yang, Z. Zimmer, S. 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
title	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
title_full	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
title_fullStr	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
title_full_unstemmed	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
title_short	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
title_sort	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
topic	galaxies: halos gamma rays: galaxies galaxies: active intergalactic medium instrumentation: detectors
url	http://hdl.handle.net/20.500.11937/16589

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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