Details

Autor(en) / Beteiligte

• Abeysekara, A. U.
• Archer, A.
• Benbow, W.
• Bird, R.
• Brose, R.
• Buchovecky, M.
• Buckley, J. H.
• Chromey, A. J.
• Cui, W.
• Daniel, M. K.
• Das, S.
• Dwarkadas, V. V.
• Falcone, A.
• Feng, Q.
• Finley, J. P.
• Fortson, L.
• Gent, A.
• Gillanders, G. H.
• Giuri, C.
• Gueta, O.
• Hanna, D.
• Hassan, T.
• Hervet, O.
• Holder, J.
• Hughes, G.
• Humensky, T. B.
• Kaaret, P.
• Kar, P.
• Kelley-Hoskins, N.
• Kertzman, M.
• Kieda, D.
• Krause, M.
• Krennrich, F.
• Kumar, S.
• Lang, M. J.
• Maier, G.
• Moriarty, P.
• Mukherjee, R.
• Nievas-Rosillo, M.
• O'Brien, S.
• Ong, R. A.
• Park, N.
• Petrashyk, A.
• Pfrang, K.
• Pohl, M.
• Pueschel, E.
• Quinn, J.
• Ragan, K.
• Reynolds, P. T.
• Richards, G. T.
• Roache, E.
• Sadeh, I.
• Santander, M.
• Sembroski, G. H.
• Shahinyan, K.
• Sushch, I.
• Weinstein, A.
• Wilcox, P.
• Wilhelm, A.
• Williams, D. A.
• Williamson, T. J
• Zitzer, B.
• Ghiotto, A.

Titel

Evidence for Proton Acceleration up to TeV Energies Based on VERITAS and Fermi-LAT Observations of the Cas A SNR

Ist Teil von

• The Astrophysical journal, 2020-05, Vol.894 (1), p.51

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present a study of γ-ray emission from the core-collapse supernova remnant Cas A in the energy range from 0.1 GeV to 10 TeV. We used 65 hr of the Very Energetic Radiation Imaging Telescope Array System (VERITAS) data to cover 200 GeV-10 TeV, and 10.8 yr of Fermi-Large Area Telescope (LAT) data to cover 0.1-500 GeV. The spectral analysis of Fermi-LAT data shows a significant spectral curvature around 1.3 0.4stat GeV that is consistent with the expected spectrum from pion decay. Above this energy, the joint spectrum from Fermi-LAT and VERITAS deviates significantly from a simple power law, and it is best described by a power law with a spectral index of 2.17 0.02stat and a cutoff energy of 2.3 0.5stat TeV. These results, along with radio, X-ray, and γ-ray data, are interpreted in the context of leptonic and hadronic models. Assuming a one-zone model, we exclude a purely leptonic scenario and conclude that proton acceleration up to at least 6 TeV is required to explain the observed γ-ray spectrum. From modeling of the entire multiwavelength spectrum, a minimum magnetic field inside the remnant of Bmin 150 G is deduced.