Powerful Diagnostics of Cosmic-Ray Modified Shock by Hα Polarimetry
July 06, 2021
We show that the polarimetry of H$\alpha$ emission in supernova remnant shocks can be powerful diagnostics of cosmic-ray modified shocks (CRMSs). Solving the radiative line transfer problem in collisionless shocks propagating into a partially ionized medium, we find directions of the linearly polarized H$\alpha$ depend strongly on the existence of shock modification; the direction is parallel to the direction of shock travel for the case of the CRMS, while the direction is perpendicular for the case of no modification.
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