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No evidence yet for hadronic TeV gamma-ray emission from SNR RX J1713.7-3946 | O. Reimer
; M. Pohl
; | Date: |
16 May 2002 | Journal: | Astron.Astrophys. 390 (2002) L43 | Subject: | astro-ph | Abstract: | Recent TeV-scale gamma-ray observations with the CANGAROO II telescope have led to the claim that the multi-band spectrum of RX J1713.7-3946 cannot be explained as the composite of a synchrotron and an inverse Compton component emitted by a population of relativistic electrons. It was argued that the spectrum of the high-energy emission is a good match to that predicted by pion decay, thus providing observational evidence that protons are accelerated in SNR to at least TeV energies. In this Letter we discuss the multi-band spectrum of RX J1713.7-3946 under the constraint that the GeV-scale emission observed from the closely associated EGRET source 3EG J1714-3857 is either associated with the SNR or an upper limit to the gamma-ray emission of the SNR. We find that the pion-decay model adopted by Enomoto et al. is in conflict with the existing GeV data. We have examined the possibility of a modified proton spectrum to explain the data, and find that we cannot do so within any existing theoretical framework of shock acceleration models. | Source: | arXiv, astro-ph/0205256 | Services: | Forum | Review | PDF | Favorites |
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