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]
Journal Article
·
· The Astrophysical Journal
- Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
- Univ. of Iceland, Reykjavik (Iceland)
- 3-34-1 Nishi-Ikebukuro, Tokyo (Japan)
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1356549
- Journal Information:
- The Astrophysical Journal, Vol. 779, Issue 2; ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 28 works
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