Journal article
Evidence for Proton Acceleration up to TeV Energies Based on VERITAS and Fermi-LAT Observations of the Cas A SNR
The Astrophysical journal, v 894(1), p51
01 May 2020
Abstract
We present a study of gamma-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 0.4(stat) 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 0.02(stat) and a cutoff energy of 2.3 0.5(stat) TeV. These results, along with radio, X-ray, and gamma-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 gamma-ray spectrum. From modeling of the entire multiwavelength spectrum, a minimum magnetic field inside the remnant of B-min 150 mu G is deduced.
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Details
- Title
- Evidence for Proton Acceleration up to TeV Energies Based on VERITAS and Fermi-LAT Observations of the Cas A SNR
- Creators
- A. U. Abeysekara - University of UtahA. Archer - DePauw UniversityW. Benbow - Center for Astrophysics Harvard & SmithsonianR. Bird - University of California, Los AngelesR. Brose - University of PotsdamM. Buchovecky - University of California, Los AngelesJ. H. Buckley - Washington University in St. LouisA. J. Chromey - Iowa State UniversityW. Cui - Purdue University West LafayetteM. K. Daniel - Center for Astrophysics Harvard & SmithsonianS. Das - McGill UniversityV. V. Dwarkadas - University of ChicagoA. Falcone - Pennsylvania State UniversityQ. Feng - Columbia UniversityJ. P. Finley - Purdue University West LafayetteL. Fortson - University of MinnesotaA. Gent - Georgia Institute of TechnologyG. H. Gillanders - Ollscoil na Gaillimhe – University of GalwayC. Giuri - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyO. Gueta - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyD. Hanna - McGill UniversityT. Hassan - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyO. Hervet - University of California, Santa CruzJ. Holder - University of DelawareG. Hughes - Pennsylvania State UniversityT. B. Humensky - Columbia UniversityP. Kaaret - University of IowaP. Kar - University of UtahN. Kelley-Hoskins - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM. Kertzman - DePauw UniversityD. Kieda - University of UtahM. Krause - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyF. Krennrich - Iowa State UniversityS. Kumar - McGill UniversityM. J. Lang - Ollscoil na Gaillimhe – University of GalwayG. Maier - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyP. Moriarty - Ollscoil na Gaillimhe – University of GalwayR. Mukherjee - Barnard CollegeM. Nievas-Rosillo - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyS. O'Brien - McGill UniversityR. A. Ong - University of California, Los AngelesN. Park - University of Wisconsin–MadisonA. Petrashyk - Columbia UniversityK. Pfrang - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM. Pohl - University of PotsdamE. Pueschel - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyJ. Quinn - University College DublinK. Ragan - McGill UniversityP. T. Reynolds - Munster Technological UniversityG. T. Richards - University of DelawareE. Roache - Center for Astrophysics Harvard & SmithsonianSadeh - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM. Santander - University of AlabamaG. H. Sembroski - Purdue University West LafayetteK. Shahinyan - University of MinnesotaSushch - University of PotsdamA. Weinstein - Iowa State UniversityP. Wilcox - University of IowaA. Wilhelm - University of PotsdamD. A. Williams - University of California, Santa CruzT. J. Williamson - University of DelawareB. Zitzer - McGill UniversityA. Ghiotto - Columbia University
- Publication Details
- The Astrophysical journal, v 894(1), p51
- Publisher
- IOP Publishing Ltd
- Number of pages
- 13
- Grant note
- NSERC in Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) Smithsonian Institution 1911061 / NSF; National Science Foundation (NSF) U.S. National Science Foundation; National Science Foundation (NSF) 1911061 / Division Of Astronomical Sciences; Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) U.S. Department of Energy Office of Science; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000532440500001
- Scopus ID
- 2-s2.0-85085328243
- Other Identifier
- 991021869042004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics