Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/136669
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Type: | Journal article |
Title: | Evidence for γ-ray emission from the remnant of Kepler's supernova based on deep H.E.S.S. observations |
Author: | Aharonian, F. Benkhali, F.A. Angüner, E.O. Ashkar, H. Backes, M. Martins, V.B. Batzofin, R. Becherini, Y. Berge, D. Bernlöhr, K. Böttcher, M. Boisson, C. Bolmont, J. Lavergne, M.D.B.D. Breuhaus, M. Brose, R. Brun, F. Bulik, T. Bylund, T. Cangemi, F. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2022; 662:1-9 |
Publisher: | EDP Sciences |
Issue Date: | 2022 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | H.E.S.S. Collaboration ... F. Aharonian ... S. Einecke ..., G. Rowell ... et al. |
Abstract: | Observations with imaging atmospheric Cherenkov telescopes (IACTs) have enhanced our knowledge of nearby supernova (SN) remnants with ages younger than 500 yr by establishing Cassiopeia A and the remnant of Tycho's SN as very-high-energy (VHE) gamma-ray sources. The remnant of Kepler's SN, which is the product of the most recent naked-eye SN in our Galaxy, is comparable in age to the other two, but is significantly more distant. If the gamma-ray luminosities of the remnants of Tycho's and Kepler's SNe are similar, then the latter is expected to be one of the faintest gamma-ray sources within reach of the current generation IACT arrays. Here we report evidence at a statistical level of 4.6sigma for a VHE signal from the remnant of Kepler's SN based on deep observations by the High Energy Stereoscopic System (H.E.S.S.) with an exposure of 152 h. The measured integral flux above an energy of 226 GeV is ~0.3% of the flux of the Crab Nebula. The spectral energy distribution (SED) reveals a gamma-ray emitting component connecting the VHE emission observed with H.E.S.S. to the emission observed at GeV energies with Fermi-LAT. The overall SED is similar to that of the remnant of Tycho's SN, possibly indicating the same nonthermal emission processes acting in both these young remnants of thermonuclear SNe. |
Keywords: | gamma rays: general / supernovae: individual: Kepler / ISM: supernova remnants / radiation mechanisms: non-thermal |
Rights: | © H.E.S.S. Collaboration 2022. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
DOI: | 10.1051/0004-6361/202243096 |
Published version: | http://dx.doi.org/10.1051/0004-6361/202243096 |
Appears in Collections: | Physics publications |
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hdl_136669.pdf | Published version | 850.76 kB | Adobe PDF | View/Open |
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