Emission of SN 1006 produced by accelerated cosmic rays

E. G. Berezhko; L. T. Ksenofontov; H. J. Völk

doi:doi:10.1051/0004-6361:20021219

Free access

Issue		A&A Volume 395, Number 3, December I 2002


Page(s)		943 - 953
Section		Diffuse matter in space
DOI		http://dx.doi.org/10.1051/0004-6361:20021219

A&A 395, 943-953 (2002)
DOI: 10.1051/0004-6361:20021219

Emission of SN 1006 produced by accelerated cosmic rays

E. G. Berezhko¹, L. T. Ksenofontov¹ and H. J. Völk²

¹ Institute of Cosmophysical Research and Aeronomy, 31 Lenin Av., 677891 Yakutsk, Russia
e-mail: berezhko@ikfia.ysn.ru
e-mail: ksenofon@ikfia.ysn.ru
² Max Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany

(Received 8 April 2002 / Accepted 23 August 2002 )

Abstract
The nonlinear kinetic model of cosmic ray (CR) acceleration in supernova remnants (SNRs) is used to describe the properties of the remnant of SN 1006. It is shown, that the theory fits the existing data in a satisfactory way within a set of parameters which is consistent with the idea that SN 1006 is a typical source of Galactic CR nucleons, although not necessarily of CR electrons. The adjusted parameters are those that are not very well determined by present theory or not directly amenable to astronomical observations. The calculated expansion law and the radio-, X-ray and $\gamma$ -ray emissions produced by the accelerated CRs in SN 1006 agree quite well with the observations. A rather large interior magnetic field $B_\mathrm{d}\approx 100$ $\mu$ G is required to give a good fit for the radio and X-ray synchrotron emission. In the predicted TeV $\gamma$ -ray flux from SN 1006, the $\pi^0$ -decay $\gamma$ -rays, generated by the nuclear CR component, dominate over the inverse Compton (IC) $\gamma$ -rays, generated by the CR electrons in the cosmic microwave background. The predicted source morphology in high energy $\gamma$ -rays roughly corresponds to that of the synchrotron emission. The predicted integral $\gamma$ -ray flux $F_{\gamma}\propto \epsilon_{\gamma}^{-1}$ extends up to energies ~100 TeV if CR diffusion is as strong as the Bohm limit. Only if the interior magnetic field is much lower in the SNR, $B_\mathrm{d}\approx 10$ $\mu$ G, then the observed $\gamma$ -ray emission can be due to the accelerated electron component alone. In this case, not plausible physically in our view, the lowest permissible value of the electron to proton ratio is rather high, and the maximum individual energy and total energy content of accelerated nucleons so small, that SN 1006 can not be considered as a typical source of the nuclear Galactic CRs.

Key words: ISM: cosmic rays -- acceleration of particles -- stars: supernovae: individual: SN 1006 -- radio continuum: ISM -- X-rays: ISM -- gamma rays: theory

Offprint request: H. J. Völk, Heinrich.Voelk@mpi-hd.mpg.de

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