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The Astrophysical Journal Volume 685 Number 2 Create an alert RSS this journal

Takaaki Tanaka et al. 2008 ApJ 685 988 doi:10.1086/591020

Study of Nonthermal Emission from SNR RX J1713.7–3946 with Suzaku

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Takaaki Tanaka1,2, Yasunobu Uchiyama1, Felix A. Aharonian3,4, Tadayuki Takahashi1,5, Aya Bamba1, Junko S. Hiraga6, Jun Kataoka7, Tetsuichi Kishishita1,5, Motohide Kokubun1, Koji Mori8, Kazuhiro Nakazawa5, Robert Petre9, Hiroyasu Tajima2 and Shin Watanabe1

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Abstract References Cited By
We present results obtained from a series of observations of the supernova remnant RX J1713.7–3946 by Suzaku. Hard X-rays have been detected up to ~40 keV. The hard X-ray spectra are described by a power law with photon indices of ~3.0, which is larger than those below 10 keV. The combination of the spatially integrated XIS and HXD spectra clearly reveals a spectral cutoff which is linked to the maximum energy of accelerated electrons. The broadband coverage of Suzaku allows us to derive, for the first time, the energy spectrum of parent electrons in the cutoff region. The cutoff energy in the X-ray spectrum indicates that the electron acceleration in the remnant proceeds close to the Bohm diffusion limit. We discuss the implications of the spectral and morphological properties of the Suzaku data in the context of the origin of nonthermal emission. The Suzaku X-ray and H.E.S.S. gamma-ray data together hardly can be explained within a pure leptonic scenario. Moreover, the leptonic models require a weak magnetic field, which is inconsistent with the recently discovered X-ray filamentary structures and their short-term variability. The hadronic models with strong magnetic fields provide reasonable fits to the observed spectra, but require special arrangements of parameters to explain the lack of thermal X-ray emission. For morphology studies, we compare the X-ray and TeV gamma-ray surface brightness. We confirm the previously reported strong correlation between X-rays and TeV gamma rays. At the same time, the Suzaku data reveal a deviation from the general tendency, namely, the X-ray emission in the western rims appears brighter than expected from the average X-ray to gamma-ray ratio.

Subject headings

acceleration of particles; ISM: individual (RX J1713.7–3946); supernova remnants; X-rays: ISM


Dates

Issue 2 (2008 October 1)

Received 2008 March 26, accepted for publication 2008 May 31



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