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Prog. Theor. Phys. Vol. 80 No. 1 (1988) pp. 83-95
Non-Equilibrium Thermal X-Ray Emission in Early Phase of Supernova Remnant
Tatsuo Yoshida and
Hitoshi Hanami
Department of Physics, Hokkaido University, Sapporo 060
(Received February 3, 1988)
Abstract:
The X-ray emission from the interaction of the ejecta with
circumstellar matter (CSM) in the early phase of a supernova remnant
is investigated. The electrons can be heated only through the Coulomb
collisions with the ions behind the shock front. The electron and the
ion temperatures seem to be in non-equilibrium. Thus, in order to
estimate the electron temperature and the X-ray luminosity, we study
the two-temperature model in the early phase. Self-similar solutions
are applied to describe the structure of the interaction region with
shocked ejecta and shocked CSM. The average electron temperature and
the X-ray luminosity are estimated. They are expressed as a function
of the ratio of the progenitor's mass loss rate to the wind
velocity. From an observed luminosity, we determine the ratio, which
characterizes the density of the CSM. As an example, the X-ray
observations for SN1987A in the range of 4-12 keV and 0.2-2.1 keV are
analyzed in terms of the simple analytic method. These observations
are explained as follows: When the ejecta have interacted with
relatively dense CSM, which had been formed in the stage of the red
supergiant before the blue supergiant, the X-ray emission from SN1987A
has been detected. The soft X-ray emission below 1 keV will become
dominant in several decades after the explosion of SN1987A.
URL :
http://ptp.ipap.jp/link?PTP/80/83/
DOI : 10.1143/PTP.80.83
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