Issue |
A&A
Volume 395, Number 3, December I 2002
|
|
---|---|---|
Page(s) | 943 - 953 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20021219 | |
Published online | 18 November 2002 |
Emission of SN 1006 produced by accelerated cosmic rays
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
Corresponding author: H. J. Völk, Heinrich.Voelk@mpi-hd.mpg.de
Received:
8
April
2002
Accepted:
23
August
2002
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 γ-ray emissions produced by
the accelerated CRs in SN 1006 agree quite well with the observations. A
rather large interior magnetic field μG is
required to give a good fit for the radio and X-ray synchrotron emission.
In the predicted TeV γ-ray flux from SN 1006, the
-decay
γ-rays, generated by the nuclear CR component, dominate over the
inverse Compton (IC) γ-rays, generated by the CR electrons in the
cosmic microwave background. The predicted source morphology in high
energy γ-rays roughly corresponds to that of the synchrotron
emission. The predicted integral γ-ray flux
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,
μG, then the
observed γ-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
© ESO, 2002
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