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Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data

We present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positro... Full description

Journal Title: Physical Review Letters 01 March 2017, Vol.118(9)
Main Author: Abdollahi, S
Other Authors: Ackermann, M , Ajello, M , Albert, A , Atwood, W. B , Baldini, L , Barbiellini, G , Bellazzini, R , Bissaldi, E , Bloom, E. D , Bonino, R , Bottacini, E , Brandt, T. J , Bruel, P , Buson, S , Caragiulo, M , Cavazzuti, E , Chekhtman, A , Ciprini, S , Costanza, F , Cuoco, A , Cutini, S , D’ammando, F , de Palma, F , Desiante, R , Digel, S. W , Di Lalla, N , Di Mauro, M , Di Venere, L , Donaggio, B , Drell, P. S , Favuzzi, C , Focke, W. B , Fukazawa, Y , Funk, S , Fusco, P , Gargano, F , Gasparrini, D , Giglietto, N , Giordano, F , Giroletti, M , Green, D , Guiriec, S , Harding, A. K , Jogler, T , Jóhannesson, G , Kamae, T , Kuss, M , Larsson, S , Latronico, L , Li, J , Longo, F , Loparco, F , Lubrano, P , Magill, J. D , Malyshev, D , Manfreda, A , Mazziotta, M. N , Meehan, M , Michelson, P. F , Mitthumsiri, W , Mizuno, T , Moiseev, A. A , Monzani, M. E , Morselli, A , Negro, M , Nuss, E , Ohsugi, T , Omodei, N , Paneque, D , Perkins, J. S , Pesce-Rollins, M , Piron, F , Pivato, G , Principe, G , Rainò, S , Rando, R , Razzano, M , Reimer, A , Reimer, O , Sgrò, C , Simone, D , Siskind, E. J , Spada, F , Spandre, G , Spinelli, P , Strong, A. W , Tajima, H , Thayer, J. B , Torres, D. F , Troja, E , Vandenbroucke, J , Zaharijas, G , Zimmer, S
Format: Electronic Article Electronic Article
Language: English
Subjects:
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ID: ISSN: 0031-9007 ; E-ISSN: 1079-7114 ; DOI: 10.1103/PhysRevLett.118.091103
Link: https://www.osti.gov/servlets/purl/1355735
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title: Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
format: Article
creator:
  • Abdollahi, S
  • Ackermann, M
  • Ajello, M
  • Albert, A
  • Atwood, W. B
  • Baldini, L
  • Barbiellini, G
  • Bellazzini, R
  • Bissaldi, E
  • Bloom, E. D
  • Bonino, R
  • Bottacini, E
  • Brandt, T. J
  • Bruel, P
  • Buson, S
  • Caragiulo, M
  • Cavazzuti, E
  • Chekhtman, A
  • Ciprini, S
  • Costanza, F
  • Cuoco, A
  • Cutini, S
  • D’ammando, F
  • de Palma, F
  • Desiante, R
  • Digel, S. W
  • Di Lalla, N
  • Di Mauro, M
  • Di Venere, L
  • Donaggio, B
  • Drell, P. S
  • Favuzzi, C
  • Focke, W. B
  • Fukazawa, Y
  • Funk, S
  • Fusco, P
  • Gargano, F
  • Gasparrini, D
  • Giglietto, N
  • Giordano, F
  • Giroletti, M
  • Green, D
  • Guiriec, S
  • Harding, A. K
  • Jogler, T
  • Jóhannesson, G
  • Kamae, T
  • Kuss, M
  • Larsson, S
  • Latronico, L
  • Li, J
  • Longo, F
  • Loparco, F
  • Lubrano, P
  • Magill, J. D
  • Malyshev, D
  • Manfreda, A
  • Mazziotta, M. N
  • Meehan, M
  • Michelson, P. F
  • Mitthumsiri, W
  • Mizuno, T
  • Moiseev, A. A
  • Monzani, M. E
  • Morselli, A
  • Negro, M
  • Nuss, E
  • Ohsugi, T
  • Omodei, N
  • Paneque, D
  • Perkins, J. S
  • Pesce-Rollins, M
  • Piron, F
  • Pivato, G
  • Principe, G
  • Rainò, S
  • Rando, R
  • Razzano, M
  • Reimer, A
  • Reimer, O
  • Sgrò, C
  • Simone, D
  • Siskind, E. J
  • Spada, F
  • Spandre, G
  • Spinelli, P
  • Strong, A. W
  • Tajima, H
  • Thayer, J. B
  • Torres, D. F
  • Troja, E
  • Vandenbroucke, J
  • Zaharijas, G
  • Zimmer, S
subjects:
  • Astronomy And Astrophysics
  • Cosmic Ray Electrons
  • Anisotropy
  • Pulsar
  • Snr
  • Dark Matter
  • Physics
ispartof: Physical Review Letters, 01 March 2017, Vol.118(9)
description: We present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10-3. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. Lastly, the present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.
language: eng
source:
identifier: ISSN: 0031-9007 ; E-ISSN: 1079-7114 ; DOI: 10.1103/PhysRevLett.118.091103
fulltext: no_fulltext
issn:
  • 0031-9007
  • 00319007
  • 1079-7114
  • 10797114
url: Link


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creatorAbdollahi, S ; Ackermann, M ; Ajello, M ; Albert, A ; Atwood, W. B ; Baldini, L ; Barbiellini, G ; Bellazzini, R ; Bissaldi, E ; Bloom, E. D ; Bonino, R ; Bottacini, E ; Brandt, T. J ; Bruel, P ; Buson, S ; Caragiulo, M ; Cavazzuti, E ; Chekhtman, A ; Ciprini, S ; Costanza, F ; Cuoco, A ; Cutini, S ; D’ammando, F ; de Palma, F ; Desiante, R ; Digel, S. W ; Di Lalla, N ; Di Mauro, M ; Di Venere, L ; Donaggio, B ; Drell, P. S ; Favuzzi, C ; Focke, W. B ; Fukazawa, Y ; Funk, S ; Fusco, P ; Gargano, F ; Gasparrini, D ; Giglietto, N ; Giordano, F ; Giroletti, M ; Green, D ; Guiriec, S ; Harding, A. K ; Jogler, T ; Jóhannesson, G ; Kamae, T ; Kuss, M ; Larsson, S ; Latronico, L ; Li, J ; Longo, F ; Loparco, F ; Lubrano, P ; Magill, J. D ; Malyshev, D ; Manfreda, A ; Mazziotta, M. N ; Meehan, M ; Michelson, P. F ; Mitthumsiri, W ; Mizuno, T ; Moiseev, A. A ; Monzani, M. E ; Morselli, A ; Negro, M ; Nuss, E ; Ohsugi, T ; Omodei, N ; Paneque, D ; Perkins, J. S ; Pesce-Rollins, M ; Piron, F ; Pivato, G ; Principe, G ; Rainò, S ; Rando, R ; Razzano, M ; Reimer, A ; Reimer, O ; Sgrò, C ; Simone, D ; Siskind, E. J ; Spada, F ; Spandre, G ; Spinelli, P ; Strong, A. W ; Tajima, H ; Thayer, J. B ; Torres, D. F ; Troja, E ; Vandenbroucke, J ; Zaharijas, G ; Zimmer, S
contributorSlac National Accelerator Lab., Menlo Park, Ca (United States) (Corporate Author)
ispartofPhysical Review Letters, 01 March 2017, Vol.118(9)
identifier
subjectAstronomy And Astrophysics ; Cosmic Ray Electrons ; Anisotropy ; Pulsar ; Snr ; Dark Matter ; Physics
descriptionWe present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10-3. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. Lastly, the present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.
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titleSearch for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
description

We present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10-3. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. Lastly, the present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.

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titleSearch for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
authorAbdollahi, S ; Ackermann, M ; Ajello, M ; Albert, A ; Atwood, W. B ; Baldini, L ; Barbiellini, G ; Bellazzini, R ; Bissaldi, E ; Bloom, E. D ; Bonino, R ; Bottacini, E ; Brandt, T. J ; Bruel, P ; Buson, S ; Caragiulo, M ; Cavazzuti, E ; Chekhtman, A ; Ciprini, S ; Costanza, F ; Cuoco, A ; Cutini, S ; D’ammando, F ; de Palma, F ; Desiante, R ; Digel, S. W ; Di Lalla, N ; Di Mauro, M ; Di Venere, L ; Donaggio, B ; Drell, P. S ; Favuzzi, C ; Focke, W. B ; Fukazawa, Y ; Funk, S ; Fusco, P ; Gargano, F ; Gasparrini, D ; Giglietto, N ; Giordano, F ; Giroletti, M ; Green, D ; Guiriec, S ; Harding, A. K ; Jogler, T ; Jóhannesson, G ; Kamae, T ; Kuss, M ; Larsson, S ; Latronico, L ; Li, J ; Longo, F ; Loparco, F ; Lubrano, P ; Magill, J. D ; Malyshev, D ; Manfreda, A ; Mazziotta, M. N ; Meehan, M ; Michelson, P. F ; Mitthumsiri, W ; Mizuno, T ; Moiseev, A. A ; Monzani, M. E ; Morselli, A ; Negro, M ; Nuss, E ; Ohsugi, T ; Omodei, N ; Paneque, D ; Perkins, J. S ; Pesce-Rollins, M ; Piron, F ; Pivato, G ; Principe, G ; Rainò, S ; Rando, R ; Razzano, M ; Reimer, A ; Reimer, O ; Sgrò, C ; Simone, D ; Siskind, E. J ; Spada, F ; Spandre, G ; Spinelli, P ; Strong, A. W ; Tajima, H ; Thayer, J. B ; Torres, D. F ; Troja, E ; Vandenbroucke, J ; Zaharijas, G ; Zimmer, S
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abstract

We present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10-3. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. Lastly, the present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.

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