Balmer-Dominated Shocks in the Cygnus Loop: Probing Collisionless Shock Physics

Details Balmer-Dominated Shocks in the Cygnus Loop: Probing Collisionless Shock Physics Balmer-Dominated Shocks in the Cygnus Loop: Probing Collisionless Shock Physics

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..861g&link_type=abstract

Chandra Proposal ID #03500712

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Chandra Proposal Id #03500712

Scientific paper

We propose ACIS-S3 pointings at the two best-studied Balmer-dominated shocks in the Cygnus Loop. Abundant optical and UV data are available (including FUSE pointings). Because of its low extinction, the Cygnus Loop is one of only five galactic remnants observable in the UV. One Balmer filament is a fast (~350 km/s) collisionless shock, the other a slower (~180 km/s), rapidly decelerating shock on the verge of becoming radiative. These shocks sample two phases in the evolution of the shock/wall interaction. Using Chandra's high resolution, we will extract spectra for narrow regions paralleling the optical shocks to obtain the postshock variation. This combination of Chandra, optical, and UV data will greatly constrain models for collisionless shock physical properties and shock evolution.

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