Expected gamma-ray emission of supernova remnant SN 1987A.
BEREZHKO E.G., KSENOFONTOV L.T. and VOLK H.J.
Abstract (from CDS):
A nonlinear kinetic theory of cosmic ray (CR) acceleration in supernova remnants (SNRs) is employed to re-examine the nonthermal properties of the remnant of SN 1987A for an extended evolutionary period of 5-100 yr. It is shown that an efficient production of nuclear CRs leads to a strong modification of the outer SNR shock and to a large downstream magnetic field Bd~ 20 mG. The shock modification and the strong field are required to yield the steep radio emission spectrum observed, as well as the considerable synchrotron cooling of high-energy electrons which diminishes their X-ray synchrotron flux. These features are also consistent with the existing X-ray observations. The expected γ-ray energy flux at TeV energies at the current epoch is nearly εγFγ~ 4x10–13 erg.cm2/s under reasonable assumptions about the overall magnetic field topology and the turbulent perturbations of this field. The general nonthermal strength of the source is expected to increase roughly by a factor of two over the next 15-20 years; thereafter, it should decrease with time in a secular form.
acceleration of particles - gamma rays: general - ISM: individual: SN 1987A - ISM: supernova remnants - X-rays: individual: SN 1987A