A&A 451, 981-990 (2006)
Theory of cosmic ray production in the supernova remnant RX J1713.7-3946E. G. Berezhko1 and H. J. Völk2
1 Yu. G. Shafer Institute of Cosmophysical Research and Aeronomy, 31 Lenin Ave., 677980 Yakutsk, Russia
2 Max Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
(Received 26 November 2005 / Accepted 30 January 2006 )
Aims.A nonlinear kinetic theory of cosmic ray (CR) acceleration in supernova remnants (SNRs) is employed to investigate the properties of SNR RX J1713.7-3946.
Methods.Observations of the nonthermal radio and X-ray emission spectra as well as the HESS measurements of the very high energy -ray emission are used to constrain the astronomical and the particle acceleration parameters of the system.
Results.Under the assumptions that RX J1713.7-3946 was a core collapse supernova (SN) of type II/Ib with a massive progenitor, has an age of yr and is at a distance of kpc, the theory gives indeed a consistent description for all the existing observational data. Specifically it is shown that an efficient production of nuclear CRs, leading to strong shock modification, and a large downstream magnetic field strength G can reproduce in detail the observed synchrotron emission from radio to X-ray frequencies together with the -ray spectral characteristics as observed by the HESS telescopes. Small-scale filamentary structures observed in nonthermal X-rays provide empirical confirmation for the field amplification scenario which leads to a strong depression of the inverse Compton and Bremsstrahlung fluxes. Going beyond that and using a semi-empirical relation for young SNRs between the resulting CR pressure and the amplified magnetic field energy upstream of the outer SN shock as well as a moderate upper bound for the mechanical explosion energy, it is possible to also demonstrate the actual need for a considerable shock modification in RX J1713.7-3946. It is consistent with RX J1713.7-3946 being an efficient source of nuclear cosmic rays.
Key words: cosmic rays -- acceleration of particles -- supernovae: individual: SNR RX J1713.7-3946 -- gamma rays: theory -- shock waves -- X-rays: stars
© ESO 2006