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Title: FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A

Abstract

We report on the first detection of GeV high-energy gamma-ray emission from a young supernova remnant (SNR) with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope. These observations reveal a source with no discernible spatial extension detected at a significance level of 12.2{sigma} above 500 MeV at a location that is consistent with the position of the remnant of the supernova explosion that occurred around 1680 in the Cassiopeia constellation-Cassiopeia A (Cas A). The gamma-ray flux and spectral shape of the source are consistent with a scenario in which the gamma-ray emission originates from relativistic particles accelerated in the shell of this remnant. The total content of cosmic rays (electrons and protons) accelerated in Cas A can be estimated as W {sub CR} {approx_equal} (1-4) x 10{sup 49} erg thanks to the well-known density in the remnant assuming that the observed gamma ray originates in the SNR shell(s). The magnetic field in the radio-emitting plasma can be robustly constrained as B {>=} 0.1 mG, providing new evidence of the magnetic field amplification at the forward shock and the strong field in the shocked ejecta.0.

Authors:
 [1]; ; ; ; ; ; ; ;  [2]; ; ; ;  [3];  [4];  [5];  [6];  [7];  [8];  [9]
  1. Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
  2. W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
  3. Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
  4. Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France)
  5. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
  6. Department of Physics and Astronomy, Rice University, MS-108, P.O. Box 1892, Houston, TX 77251 (United States)
  7. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
  8. Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210 (United States)
  9. Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)
Publication Date:
OSTI Identifier:
21301295
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 710; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/710/1/L92; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COSMIC ELECTRONS; COSMIC PROTONS; GAMMA RADIATION; GEV RANGE; MAGNETIC FIELDS; PHOTON EMISSION; RELATIVISTIC RANGE; SUPERNOVA REMNANTS; TELESCOPES

Citation Formats

Abdo, A A, Ackermann, M, Ajello, M, Allafort, A, Bechtol, K, Berenji, B, Blandford, R D, Bloom, E D, Borgland, A W, Baldini, L, Bellazzini, R, Bregeon, J, Brez, A, Ballet, J, Barbiellini, G, Baring, M G, Bastieri, D, Baughman, B M, Bonamente, E, and Brigida, M. FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A. United States: N. p., 2010. Web. doi:10.1088/2041-8205/710/1/L92; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Abdo, A A, Ackermann, M, Ajello, M, Allafort, A, Bechtol, K, Berenji, B, Blandford, R D, Bloom, E D, Borgland, A W, Baldini, L, Bellazzini, R, Bregeon, J, Brez, A, Ballet, J, Barbiellini, G, Baring, M G, Bastieri, D, Baughman, B M, Bonamente, E, & Brigida, M. FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A. United States. doi:10.1088/2041-8205/710/1/L92; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Abdo, A A, Ackermann, M, Ajello, M, Allafort, A, Bechtol, K, Berenji, B, Blandford, R D, Bloom, E D, Borgland, A W, Baldini, L, Bellazzini, R, Bregeon, J, Brez, A, Ballet, J, Barbiellini, G, Baring, M G, Bastieri, D, Baughman, B M, Bonamente, E, and Brigida, M. Wed . "FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A". United States. doi:10.1088/2041-8205/710/1/L92; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21301295,
title = {FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A},
author = {Abdo, A A and Ackermann, M and Ajello, M and Allafort, A and Bechtol, K and Berenji, B and Blandford, R D and Bloom, E D and Borgland, A W and Baldini, L and Bellazzini, R and Bregeon, J and Brez, A and Ballet, J and Barbiellini, G and Baring, M G and Bastieri, D and Baughman, B M and Bonamente, E and Brigida, M.},
abstractNote = {We report on the first detection of GeV high-energy gamma-ray emission from a young supernova remnant (SNR) with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope. These observations reveal a source with no discernible spatial extension detected at a significance level of 12.2{sigma} above 500 MeV at a location that is consistent with the position of the remnant of the supernova explosion that occurred around 1680 in the Cassiopeia constellation-Cassiopeia A (Cas A). The gamma-ray flux and spectral shape of the source are consistent with a scenario in which the gamma-ray emission originates from relativistic particles accelerated in the shell of this remnant. The total content of cosmic rays (electrons and protons) accelerated in Cas A can be estimated as W {sub CR} {approx_equal} (1-4) x 10{sup 49} erg thanks to the well-known density in the remnant assuming that the observed gamma ray originates in the SNR shell(s). The magnetic field in the radio-emitting plasma can be robustly constrained as B {>=} 0.1 mG, providing new evidence of the magnetic field amplification at the forward shock and the strong field in the shocked ejecta.0.},
doi = {10.1088/2041-8205/710/1/L92; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 710,
place = {United States},
year = {2010},
month = {2}
}