A Direct X-Ray Expansion Measurement of the SMC SNR 1E 0102.2--7219

Details A Direct X-Ray Expansion Measurement of the SMC SNR 1E 0102.2--7219 A Direct X-Ray Expansion Measurement of the SMC SNR 1E 0102.2--7219

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2817p&link_type=abstract

Chandra proposal ID #11500201

Physics

Scientific paper

We propose to make the first direct X-ray proper motion measurement of an extragalactic SNR, 1E 0102.2-7219 in the SMC. Its proper motion was indirectly measured in 2000 using a combination of Einstein, ROSAT, and Chandra data to be 0.1 %/yr. The corresponding fast shock velocity implies a higher postshock proton temperature than can be consistent with the spectrally measured electron temperature behind the forward shock unless a significant fraction of the shock energy is diverted from heating the gas, most likely to particle acceleration. A direct measurement of the shock velocity using Chandra will confirm this important result. Duplicating an early 20 ks HRC observation provides a 10 year baseline, allowing four independent proper motion measurements around the forward shock.

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