Linking gamma-ray spectra of supernova remnants to the cosmic ray injection properties in the aftermath of supernovae

Abstract

The acceleration times of the highest-energy particles which emit gamma-rays in young and middle-age SNRs are comparable with SNR age. If the number of particles starting acceleration was varying during early times after the supernova explosion then this variation should be reflected in the shape of the gamma-ray spectrum. We use the solution of the non-stationary equation for particle acceleration in order to analyze this effect. As a test case, we apply our method to describe gamma-rays from IC443. As a proxy of the IC443 parent supernova we consider SN1987A. First, we infer the time dependence of injection efficiency from evolution of the radio spectral index in SN1987A. Then, we use the inferred injection behavior to fit the gamma-ray spectrum of IC443. We show that the break in the proton spectrum needed to explain the gamma-ray emission is a natural consequence of the early variation of the cosmic ray injection, and that the very-high energy gamma-rays originate from particles which began acceleration during the first months after the supernova explosion. We conclude that the shape of the gamma-ray spectrum observed today in SNRs critically depends on the time variation of the cosmic ray injection process in the immediate post explosion phases. With the same model, we estimate also the possibility in the future to detect gamma-rays from SN 1987A.

arXiv commentA&A, accepted

References in corpus (33)

• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• Strong evidences of hadron acceleration in Tycho's Supernova Remnant
• Fermi-LAT Discovery of Extended Gamma-ray Emission in the Direction of Supernova Remnant W51C
• Discovery of VHE Gamma Radiation from IC443 with the MAGIC Telescope
• Nonthermal Radiation of Young Supernova Remnants
• Discriminating the Progenitor Type of Supernova Remnants with Iron K-Shell Emission
• Gamma-ray Emission from Crushed Clouds in Supernova Remnants
• Study of Nonthermal Emission from SNR RX J1713.7-3946 with Suzaku
• A Bow Shock Nebula Around a Compact X-Ray Source in the Supernova Remnant IC443
• The exceptionally powerful TeV gamma-ray emitters in the Large Magellanic Cloud
• Observation of Extended VHE Emission from the Supernova Remnant IC 443 with VERITAS
• Bolometric Corrections for optical light curves of Core-collapse Supernovae
• The maximum momentum of particles accelerated at cosmic ray modified shocks
• Comparison of Fermi-LAT and CTA in the region between 10-100 GeV
• Deep view of the Large Magellanic Cloud with 6 years of Fermi-LAT observations
• Supernova 1987A: a Template to Link Supernovae to their Remnants
• XMM-Newton observations of the supernova remnant IC 443: II. evidence of stellar ejecta in the inner regions
• Multi-frequency Radio Measurements of SN 1987A over 22 Years
• The X-ray Structure of the Pulsar Bow Shock G189.22+2.90 in the Supernova Remnant IC 443
• The plerion nebula in IC 443: the XMM-Newton view
• The supernova remnant W44: a case of cosmic-Ray reacceleration
• High-resolution radio observations of SNR 1987A at high frequencies
• Fourier Modeling of the Radio Torus Surrounding Supernova 1987A
• The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT
• Evolution of the Radio Remnant of Supernova 1987A: Morphological Changes from Day 7000
• High Spatial Resolution X-Ray Spectroscopy of the IC443 Pulsar Wind Nebula and Environs
• Transport of magnetic turbulence in Supernova remnants
• Multi-dimensional simulations of the expanding supernova remnant of SN 1987A
• Radio Supernova 1987A at 843 MHz
• The shape of the cutoff in the synchrotron emission of SN 1006 observed with XMM-Newton
• Time-dependent shock acceleration of particles. Effect of the time-dependent injection, with application to supernova remnants
• Re-examination of the Expected gamma-ray emission of supernova remnant SN 1987A

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