The First X-Ray Expansion Measurements of the Cygnus Loop

Details The First X-Ray Expansion Measurements of the Cygnus Loop The First X-Ray Expansion Measurements of the Cygnus Loop

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2814k&link_type=abstract

Chandra proposal ID #11500065

Computer Science

Scientific paper

We propose to perform a second-epoch observation of the northeastern limb of the Cygnus Loop supernova remnant to measure its expansion. The edges of the X-ray emission are associated with Balmer-dominated filaments whose proper motions were recently measured to be 0".09/yr. Assuming that the proper motion of the Balmer-dominated filament is equal to that of the edge of the X-ray--emitting plasma, we expect to see a shift of 0".72 between the first- and the second-epoch Chandra observations. We can directly compare proper motions between optical and X-rays, for the first time. The comparison will provide key information on the origin of the X-ray--emitting plasma in the Cygnus Loop. We request one pointing observation with an exposure time of 40ksec.

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