Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/133622
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Abdalla, H. | - |
dc.contributor.author | Aharonian, F. | - |
dc.contributor.author | Ait Benkhali, F. | - |
dc.contributor.author | Angüner, E.O. | - |
dc.contributor.author | Arcaro, C. | - |
dc.contributor.author | Armand, C. | - |
dc.contributor.author | Armstrong, T. | - |
dc.contributor.author | Ashkar, H. | - |
dc.contributor.author | Backes, M. | - |
dc.contributor.author | Baghmanyan, V. | - |
dc.contributor.author | Barbosa Martins, V. | - |
dc.contributor.author | Barnacka, A. | - |
dc.contributor.author | Barnard, M. | - |
dc.contributor.author | Batzofin, R. | - |
dc.contributor.author | Becherini, Y. | - |
dc.contributor.author | Berge, D. | - |
dc.contributor.author | Bernlöhr, K. | - |
dc.contributor.author | Bi, B. | - |
dc.contributor.author | Böttcher, M. | - |
dc.contributor.author | Boisson, C. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Astronomy and Astrophysics: a European journal, 2021; 655:A7-1-A7-13 | - |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.issn | 1432-0746 | - |
dc.identifier.uri | https://hdl.handle.net/2440/133622 | - |
dc.description.abstract | Context: Supernova remnants (SNRs) are commonly thought to be the dominant sources of Galactic cosmic rays up to the knee of the cosmic-ray spectrum at a few PeV. Imaging Atmospheric Cherenkov Telescopes have revealed young SNRs as very-high-energy (VHE, >100 GeV) gamma-ray sources, but for only a few SNRs the hadronic cosmic-ray origin of their gamma-ray emission is indisputably established. In all these cases, the gamma-ray spectra exhibit a spectral cutoff at energies much below 100 TeV and thus do not reach the PeVatron regime. Aims: The aim of this work was to achieve a firm detection for the oxygen-rich SNR LMC N132D in the VHE gamma-ray domain with an extended set of data, and to clarify the spectral characteristics and the localization of the gamma-ray emission from this exceptionally powerful gamma-ray-emitting SNR. Methods: We analyzed 252 h of High Energy Stereoscopic System (H.E.S.S.) observations towards SNR N132D that were accumulated between December 2004 and March 2016 during a deep survey of the Large Magellanic Cloud, adding 104 h of observations to the previously published data set to ensure a > 5σ detection. To broaden the gamma-ray spectral coverage required for modeling the spectral energy distribution, an analysis of Fermi-LAT Pass 8 data was also included. Results: We unambiguously detect N132D at VHE with a significance of 5.7σ. We report the results of a detailed analysis of its spectrum and localization based on the extended H.E.S.S. data set. The joint analysis of the extended H.E.S.S and Fermi-LAT data results in a spectral energy distribution in the energy range from 1.7 GeV to 14.8 TeV, which suggests a high luminosity of N132D at GeV and TeV energies. We set a lower limit on a gamma-ray cutoff energy of 8 TeV with a confidence level of 95%. The new gamma-ray spectrum as well as multiwavelength observations of N132D when compared to physical models suggests a hadronic origin of the VHE gamma-ray emission. Conclusions: SNR N132D is a VHE gamma-ray source that shows a spectrum extending to the VHE domain without a spectral cutoff at a few TeV, unlike the younger oxygen-rich SNR Cassiopeia A. The gamma-ray emission is best explained by a dominant hadronic component formed by diffusive shock acceleration. The gamma-ray properties of N132D may be affected by an interaction with a nearby molecular cloud that partially lies inside the 95% confidence region of the source position. | - |
dc.description.statementofresponsibility | H. Abdalla … S. Einecke … K. Feijen … G. Rowell … et al. (The H.E.S.S. Collaboration) | - |
dc.language.iso | en | - |
dc.publisher | EDP Sciences | - |
dc.rights | © ESO 2021 | - |
dc.source.uri | http://dx.doi.org/10.1051/0004-6361/202141486 | - |
dc.subject | Gamma rays: general; cosmic rays; ISM: supernova remnants | - |
dc.title | LMC N132D: a mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1051/0004-6361/202141486 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Einecke, S. [0000-0001-9687-8237] | - |
dc.identifier.orcid | Feijen, K. [0000-0003-1476-3714] | - |
dc.identifier.orcid | Rowell, G. [0000-0002-9516-1581] | - |
Appears in Collections: | Physics publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.