What do X-ray observations primarily reveal about the interior of an SNR during the Sedov phase?
Answer
The extremely hot, post-shock gas resulting from the adiabatic compression occurring at the shock front.
X-ray observations provide insight into the thermal conditions deep within the remnant. When an SNR is in the Sedov phase, the shock wave adiabatically compresses the captured interstellar medium, raising its temperature dramatically to millions of Kelvin. This intensely hot gas produces emission predominantly in the X-ray regime. Measuring these X-ray characteristics, such as temperature and density profiles of this interior material, is crucial for confirming the dynamical stage the remnant is currently undergoing.
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