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Title: Fermi Large Area Telescope detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A [ Fermi-LAT detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A]

Here, we report on observations of the supernova remnant Cassiopeia A in the energy range from 100 MeV to 100 GeV using 44 months of observations from the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We perform a detailed spectral analysis of this source and report on a low-energy break in the spectrum at $$1.72^{+1.35}_{-0.89}$$ GeV. By comparing the results with models for the gamma-ray emission, we find that hadronic emission is preferred for the GeV energy range.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3]
  1. Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
  2. Univ. of Iceland, Reykjavik (Iceland)
  3. 3-34-1 Nishi-Ikebukuro, Tokyo (Japan)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 779; Journal Issue: 2; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; acceleration of particles; gamma rays: general; ISM: supernova remnants; radiation mechanisms: non-thermal; supernovae: individual (Cassiopeia A)
OSTI Identifier:
1356549

Yuan, Yajie, Funk, Stefan, Jóhannesson, Gülauger, Lande, Joshua, Tibaldo, Luigi, and Uchiyama, Yasunobu. Fermi Large Area Telescope detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A [Fermi-LAT detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A]. United States: N. p., Web. doi:10.1088/0004-637X/779/2/117.
Yuan, Yajie, Funk, Stefan, Jóhannesson, Gülauger, Lande, Joshua, Tibaldo, Luigi, & Uchiyama, Yasunobu. Fermi Large Area Telescope detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A [Fermi-LAT detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A]. United States. doi:10.1088/0004-637X/779/2/117.
Yuan, Yajie, Funk, Stefan, Jóhannesson, Gülauger, Lande, Joshua, Tibaldo, Luigi, and Uchiyama, Yasunobu. 2013. "Fermi Large Area Telescope detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A [Fermi-LAT detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A]". United States. doi:10.1088/0004-637X/779/2/117. https://www.osti.gov/servlets/purl/1356549.
@article{osti_1356549,
title = {Fermi Large Area Telescope detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A [Fermi-LAT detection of a break in the gamma-ray spectrum of the supernova remnant Cassiopeia A]},
author = {Yuan, Yajie and Funk, Stefan and Jóhannesson, Gülauger and Lande, Joshua and Tibaldo, Luigi and Uchiyama, Yasunobu},
abstractNote = {Here, we report on observations of the supernova remnant Cassiopeia A in the energy range from 100 MeV to 100 GeV using 44 months of observations from the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We perform a detailed spectral analysis of this source and report on a low-energy break in the spectrum at $1.72^{+1.35}_{-0.89}$ GeV. By comparing the results with models for the gamma-ray emission, we find that hadronic emission is preferred for the GeV energy range.},
doi = {10.1088/0004-637X/779/2/117},
journal = {Astrophysical Journal},
number = 2,
volume = 779,
place = {United States},
year = {2013},
month = {12}
}