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]

Yuan, Yajie; Funk, Stefan; Jóhannesson, Gülauger; Lande, Joshua; Tibaldo, Luigi; Uchiyama, Yasunobu

doi:10.1088/0004-637X/779/2/117

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]

Journal Article · Mon Dec 02 00:00:00 EST 2013 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/779/2/117· OSTI ID:1356549

Yuan, Yajie ^[1]; Funk, Stefan ^[1]; Jóhannesson, Gülauger ^[2]; Lande, Joshua ^[1]; Tibaldo, Luigi ^[1]; Uchiyama, Yasunobu ^[3]

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.

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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

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Cited by: 28 works

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Cited By (8)

A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2018-00436	text	January 2017
Modeling snr Cassiopeia a from the Supernova Explosion to its Current age: the role of Post-Explosion Anisotropies of Ejecta Orlando, S.; Miceli, M.; Pumo, M. L. The Astrophysical Journal, Vol. 822, Issue 1 https://doi.org/10.3847/0004-637x/822/1/22	journal	April 2016
Is Supernova Remnant Cassiopeia A a PeVatron? Zhang, Xiao; Liu, Siming The Astrophysical Journal, Vol. 874, Issue 1 https://doi.org/10.3847/1538-4357/ab09fe	journal	March 2019
Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC Abeysekara, A. U.; Albert, A.; Alfaro, R. The Astrophysical Journal, Vol. 881, Issue 2 https://doi.org/10.3847/1538-4357/ab2f7d	journal	August 2019
A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A Guberman, Daniel; Cortina, Juan; de Oña Wilhelmi, Emma Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) https://doi.org/10.22323/1.301.0724	conference	August 2018
A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A. Monthly Notices of the Royal Astronomical Society, Vol. 472, Issue 3 https://doi.org/10.1093/mnras/stx2079	journal	August 2017
Modeling SNR Cassiopeia A from the Supernova Explosion to its Current Age: The role of post-explosion anisotropies of ejecta Orlando, S.; Miceli, M.; Pumo, M. L. arXiv https://doi.org/10.48550/arxiv.1603.03690	text	January 2016
Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC Collaboration, Hawc; Abeysekara, A. U.; Albert, A. arXiv https://doi.org/10.48550/arxiv.1905.12518	text	January 2019

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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]

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