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Gamma-ray flares from the Crab Nebula

A young and energetic pulsar powers the well-known Crab Nebula. Here we describe two separate gamma-ray (photon energy >100 MeV) flares from this source detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The first flare occurred in February 2009 and lasted approximate... Full description

Journal Title: Science 11 February 2011, Vol.331, pp.739-742
Main Author: A. Abdo, A
Other Authors: Ackermann, Markus , Ajello, Marco , Allafort, A , Baldini, Luca , Ballet, Jean , Barbiellini, Guido , Bastieri, D , Bechtol, K , Bellazzini, R , Berenji, B , D. Blandford, R , D. Bloom, E , Bonamente, E , W. Borgland, A , Bouvier, A , J. Brandt, T , Bregeon, J , Brez, A , Brigida, M
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0036-8075 ; E-ISSN: 1095-9203 ; DOI: 10.1126/science.1199705
Link: http://hal.in2p3.fr/in2p3-00586585
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recordid: hal_soai_HAL_in2p3_00586585v1
title: Gamma-ray flares from the Crab Nebula
format: Article
creator:
  • A. Abdo, A
  • Ackermann, Markus
  • Ajello, Marco
  • Allafort, A
  • Baldini, Luca
  • Ballet, Jean
  • Barbiellini, Guido
  • Bastieri, D
  • Bechtol, K
  • Bellazzini, R
  • Berenji, B
  • D. Blandford, R
  • D. Bloom, E
  • Bonamente, E
  • W. Borgland, A
  • Bouvier, A
  • J. Brandt, T
  • Bregeon, J
  • Brez, A
  • Brigida, M
subjects:
  • Physics
  • Astrophysics
  • High Energy Astrophysical Phenomena
  • Sciences of the Universe
  • Astrophysics
  • High Energy Astrophysical Phenomena
  • Sciences (General)
  • Biology
  • Physics
ispartof: Science, 11 February 2011, Vol.331, pp.739-742
description: A young and energetic pulsar powers the well-known Crab Nebula. Here we describe two separate gamma-ray (photon energy >100 MeV) flares from this source detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The first flare occurred in February 2009 and lasted approximately 16 days. The second flare was detected in September 2010 and lasted approximately 4 days. During these outbursts the gamma-ray flux from the nebula increased by factors of four and six, respectively. The brevity of the flares implies that the gamma rays were emitted via synchrotron radiation from PeV (10^15 eV) electrons in a region smaller than 1.4 10^-2 pc. These are the highest energy particles that can be associated with a discrete astronomical source, and they pose challenges to particle acceleration theory.
language: eng
source:
identifier: ISSN: 0036-8075 ; E-ISSN: 1095-9203 ; DOI: 10.1126/science.1199705
fulltext: no_fulltext
issn:
  • 0036-8075
  • 00368075
  • 1095-9203
  • 10959203
url: Link


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titleGamma-ray flares from the Crab Nebula
creatorA. Abdo, A ; Ackermann, Markus ; Ajello, Marco ; Allafort, A ; Baldini, Luca ; Ballet, Jean ; Barbiellini, Guido ; Bastieri, D ; Bechtol, K ; Bellazzini, R ; Berenji, B ; D. Blandford, R ; D. Bloom, E ; Bonamente, E ; W. Borgland, A ; Bouvier, A ; J. Brandt, T ; Bregeon, J ; Brez, A ; Brigida, M
ispartofScience, 11 February 2011, Vol.331, pp.739-742
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subjectPhysics ; Astrophysics ; High Energy Astrophysical Phenomena ; Sciences of the Universe ; Astrophysics ; High Energy Astrophysical Phenomena ; Sciences (General) ; Biology ; Physics
descriptionA young and energetic pulsar powers the well-known Crab Nebula. Here we describe two separate gamma-ray (photon energy >100 MeV) flares from this source detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The first flare occurred in February 2009 and lasted approximately 16 days. The second flare was detected in September 2010 and lasted approximately 4 days. During these outbursts the gamma-ray flux from the nebula increased by factors of four and six, respectively. The brevity of the flares implies that the gamma rays were emitted via synchrotron radiation from PeV (10^15 eV) electrons in a region smaller than 1.4 10^-2 pc. These are the highest energy particles that can be associated with a discrete astronomical source, and they pose challenges to particle acceleration theory.
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A young and energetic pulsar powers the well-known Crab Nebula. Here we describe two separate gamma-ray (photon energy >100 MeV) flares from this source detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The first flare occurred in February 2009 and lasted approximately 16 days. The second flare was detected in September 2010 and lasted approximately 4 days. During these outbursts the gamma-ray flux from the nebula increased by factors of four and six, respectively. The brevity of the flares implies that the gamma rays were emitted via synchrotron radiation from PeV (10^15 eV) electrons in a region smaller than 1.4 10^-2 pc. These are the highest energy particles that can be associated with a discrete astronomical source, and they pose challenges to particle acceleration theory.

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date2011-02-11