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Prog. Theor. Phys. Vol. 79 No. 2 (1988) pp. 416-428

Energy Spectrum of Ultra High Energy γ-Rays from Supernova

Yoshiyuki Yamada, Takashi Nakamura, Katsuaki Kasahara^* and Humitaka Sato

Department of Physics, Kyoto University, Kyoto 606
^*Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188

(Received October 19, 1987)

Abstract:

If a newly born neutron star in SN1987A is a powerful injector of ultra high energy (UHE) protons, UHE γ-rays will be emitted by bombardment of supernova ejecta with these UHE particles. We compute energy spectrum of the UHE γ-rays generated by monoenergetic protons using Monte-Carlo simulations at the period of high flux when the column density is 30 ∼ 100 g/cm². If the column density of the ejecta is less than ∼ 100 g/cm², low energy γ-rays do not increase as E^-2, like the case for Cyg X-3, but they have much harder spectrum close to E^-1. The expected numbers of PeV and TeV region γ-rays per hour are at least 0.16 counts (L_p/10⁴¹ ergs)(S/(50 m)²)(d/56 kpc)^-2 and 132 counts (L_p/10⁴¹ ergs)(S/30000 m²)(d/56 kpc)^-2 where L_p, S and d are the proton luminosity, the area of detectors, and the distance to LMC, respectively.

URL : http://ptp.ipap.jp/link?PTP/79/416/
DOI : 10.1143/PTP.79.416

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 81 No. 1 (1989) pp. 93-103 :

   X-Ray and γ-Rays from a Non-Spherical Patchy Supernova Ejecta

   Yoshiyuki Yamada, Katsuaki Kasahara and Takashi Nakamura

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