Thermal X-ray emission from SNe
ß
High mass loss rate, low velocity wind,
low velocity ejecta (< 30,000 km/s)
L
>
~
10
38
erg/s
f
r
H
S
Hard X-rays first
Soft X-rays later
(weeks/months)
Optically thick
cool shell
SN 1993J
Type II