2020ApJ...894...51A

Query : 2020ApJ...894...51A

2020ApJ...894...51A - Astrophys. J., 894, 51-51 (2020/May-1)

Evidence for proton acceleration up to TeV energies based on VERITAS and Fermi-LAT observations of the Cas A SNR.

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. and GHIOTTO A.

Abstract (from CDS):

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 µG is deduced.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gamma-ray astronomy - Supernova remnants - Galactic cosmic rays - Ground-based astronomy - Observational astronomy

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1254 1
2 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
3 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
4 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
5 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
6 VER J2323+588 gam 23 23 +58.8           ~ 1 0
7 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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