2017A&A...605A.110P


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.23CET17:06:36

2017A&A...605A.110P - Astronomy and Astrophysics, volume 605A, 110-110 (2017/9-1)

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

PETRUK O., ORLANDO S., MICELI M. and BOCCHINO F.

Abstract (from CDS):

The acceleration times of the highest-energy particles, which emit gamma-rays in young and middle-age supernova remnants (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 analyse this effect. As a test case, we apply our method to describe gamma-rays from IC 443. As a proxy of the IC 443 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 behaviour to fit the gamma-ray spectrum of IC 443. 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 also estimate the future possibility of detecting gamma-rays from SN 1987A.

Abstract Copyright: © ESO, 2017

Journal keyword(s): ISM: supernova remnants - supernovae: general - gamma rays: ISM - cosmic rays - cosmic rays

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4533 2
2 IC 443 SNR 06 18 02.7 +22 39 36           ~ 1112 1
3 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1219 1
4 SNR G347.3-00.5 SNR 17 12 27 -39 41.2           ~ 620 1
5 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 833 2
6 W 49b SNR 19 11 09.000 +09 06 24.00           ~ 400 1
7 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 243 0

    Equat.    Gal    SGal    Ecl

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2020.11.23-17:06:36

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