Journal article
Gamma-ray Observations of Tycho's Supernova Remnant with VERITAS and Fermi
The Astrophysical journal, Vol.836(1), 23
02/06/2017
DOI: 10.3847/1538-4357/836/1/23
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 400 GeV, the power-law index is 2.92 0.42stat 0.20sys. It is also softer than the spectral index in the GeV energy range, 2.14 0.09stat 0.02sys, 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.
Details
- Title: Subtitle
- 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 - Ollscoil na Gaillimhe – University of GalwayW Cui - Purdue University West LafayetteV. V Dwarkadas - University of ChicagoM Errando - Washington University in St. LouisA Falcone - Pennsylvania State UniversityQ Feng - McGill UniversityJ. P Finley - Purdue University West LafayetteH Fleischhack - DESY, Platanenallee 6 , D-15738 Zeuthen, GermanyL Fortson - University of MinnesotaA Furniss - California State University, East BayS Griffin - McGill UniversityM Hütten - DESY, Platanenallee 6 , D-15738 Zeuthen, GermanyD Hanna - McGill UniversityJ Holder - University of DelawareC. A Johnson - University of California, Santa CruzP 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, GermanyS Kumar - University of DelawareM. J Lang - Ollscoil na Gaillimhe – University of GalwayG Maier - DESY, Platanenallee 6 , D-15738 Zeuthen, GermanyS McArthur - Purdue University West LafayetteA McCann - McGill UniversityP Moriarty - Ollscoil na Gaillimhe – University of 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 Sadeh - DESY, Platanenallee 6 , D-15738 Zeuthen, GermanyM 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 UniversityT Weisgarber - University of Wisconsin–MadisonP Wilcox - University of IowaA Wilhelm - University of PotsdamD. A Williams - University of California, Santa CruzB Zitzer - McGill University
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.836(1), 23
- DOI
- 10.3847/1538-4357/836/1/23
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Number of pages
- 8
- Language
- English
- Date published
- 02/06/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199748202771
Metrics
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