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Journal article
Gamma-ray Observations of Tycho's Supernova Remnant with VERITAS and Fermi
The Astrophysical journal, v 836(1)
10 Feb 2017
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Abstract
High-energy gamma-ray emission from supernova remnants (SNRs) has provided a unique perspective for studies of Galactic cosmic-ray acceleration. Tycho's SNR is a particularly good target because it is a young, type Ia SNR that has been. well-studied over a wide range of energies and located in a relatively clean environment. Since the detection of gamma-ray emission from Tycho's SNR by VERITAS and Fermi-LAT, there have been several theoretical models proposed to explain its broadband emission and high-energy morphology. We report on an update to the gamma-ray measurements of Tycho's SNR with 147 hr of VERITAS and 84 months of Fermi-LAT observations, which represent about a factor of two increase in exposure over previously published data. About half of the VERITAS data benefited from a camera upgrade, which has made it possible to extend the TeV measurements toward lower energies. The TeV spectral index measured by VERITAS is consistent with previous results, but the expanded energy range softens a straight power-law fit. At energies higher than 400GeV, the power-law index is 2.92 +/- 0.42(stat) +/- 0.20(sys). It is also softer than the spectral index in the GeV energy range, 2.14 +/- 0.09(stat) +/- 0.02(sys), measured in this study using Fermi-LAT data. The centroid position of the gamma-ray emission is coincident with the center of the remnant, as well as with the centroid measurement of Fermi-LAT above 1 GeV. The results are consistent with an SNR shell origin of the emission, as many models assume. The updated spectrum points to a lower maximum particle energy than has been suggested previously.
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Details
- Title
- Gamma-ray Observations of Tycho's Supernova Remnant with VERITAS and Fermi
- Creators
- S. Archambault - McGill UniversityA. Archer - Washington University in St. LouisW. Benbow - Harvard UniversityR. Bird - University of California, Los AngelesE. Bourbeau - McGill UniversityM. Buchovecky - University of California, Los AngelesJ. H. Buckley - Washington University in St. LouisV. Bugaev - Washington University in St. LouisM. Cerruti - Harvard UniversityM. P. Connolly - National University of Ireland, GalwayW. Cui - Tsinghua UniversityV. V. Dwarkadas - University of ChicagoM. Errando - Washington University in St. LouisA. Falcone - Pennsylvania State UniversityQ. Feng - McGill UniversityJ. P. Finley - Purdue University West LafayetteH. FleischhackL. Fortson - University of MinnesotaA. Furniss - California State University, East BayS. Griffin - McGill UniversityM. HuettenD. Hanna - McGill UniversityJ. Holder - University of DelawareC. A. Johnson - University of California, Santa CruzP. Kaaret - University of IowaP. Kar - University of UtahN. Kelley-HoskinsM. Kertzman - DePauw UniversityD. Kieda - University of UtahM. KrauseS. Kumar - University of DelawareM. J. Lang - National University of Ireland, GalwayG. MaierS. McArthur - Purdue University West LafayetteA. McCann - McGill UniversityP. Moriarty - National University of Ireland, GalwayR. Mukherjee - Columbia UniversityD. Nieto - Columbia UniversityS. O'Brien - University of UtahR. A. Ong - University of California, Los AngelesA. N. Otte - Georgia Institute of TechnologyN. Park - University of ChicagoM. Pohl - University of PotsdamA. Popkow - University of California, Los AngelesE. Pueschel - University College DublinJ. Quinn - University College DublinK. Ragan - McGill UniversityP. T. Reynolds - Cork Institute of TechnologyG. T. Richards - Georgia Institute of TechnologyE. Roache - Harvard UniversityI. SadehM. Santander - Columbia UniversityG. H. Sembroski - Purdue University West LafayetteK. Shahinyan - University of MinnesotaP. Slane - Harvard UniversityD. Staszak - University of ChicagoI. Telezhinsky - University of PotsdamS. Trepanier - McGill UniversityJ. Tyler - McGill UniversityS. P. Wakely - University of ChicagoA. Weinstein - Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USAT. Weisgarber - University of Wisconsin–MadisonP. Wilcox - University of IowaA. Wilhelm - University of PotsdamD. A. Williams - University of California, Santa CruzB. Zitzer - McGill University
- Publication Details
- The Astrophysical journal, v 836(1)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 8
- Grant note
- 1402740 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) NSERC in Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) Smithsonian Institution U.S. National Science Foundation; National Science Foundation (NSF) 1505811 / Division Of Physics; 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:000397299000006
- Scopus ID
- 2-s2.0-85014176078
- Other Identifier
- 991019201454704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics