1304.7722 (H. Sano et al.)

Non-thermal X-rays and interstellar gas toward the γ-ray supernova remnant RX J1713.7-3946: Evidence for X-ray enhancement around CO and HI clumps    [PDF]

H. Sano, T. Tanaka, K. Torii, T. Fukuda, S. Yoshiike, J. Sato, H. Horachi, T. Kuwahara, T. Hayakawa, H. Matsumoto, T. Inoue, R. Yamazaki, S. Inutsuka, A. Kawamura, H. Yamamoto, T. Okuda, N. Mizuno, T. Onishi, A. Mizuno, Y. Fukui

RX J1713.7-3946 is the most remarkable very-high-energy \gamma-ray supernova remnant which emits synchrotron X-rays without thermal features. We made a comparative study of CO, HI and X-rays in order to better understand the relationship between the X-rays, and molecular and atomic gas. The results indicate that the X-rays are enhanced around the CO and HI clumps on a pc scale but decrease inside the clumps on a 0.1 pc scale. Magnetohydrodynamic numerical simulations of the shock interaction with molecular and atomic gas indicate that the interaction between the shock waves and the clumps excite turbulence which amplifies the magnetic field around the clumps. We suggest that the amplified magnetic field around the CO and HI clumps enhances the synchrotron X-rays and possibly the acceleration of cosmic-ray electrons.

View original: http://arxiv.org/abs/1304.7722