Session 46 - Supernova Remnants.
Display session, Tuesday, January 14
Metropolitan Ballroom,

## [46.05] The Discovery of Balmer-dominated Filaments around the Periphery of the Supernova Remnant RCW 86

R. C. Smith (U. Michigan)

Deep H\alpha observations of the region around the supernova remnant RCW 86 have revealed a faint complex of filaments stretching along almost the complete periphery of the remnant. The optical observations consist of CCD images made with the UM/CTIO Curtis Schmidt telescope using narrow-band H\alpha, [S II], and red continuum filters. The newly discovered filaments show up only in H\alpha, providing evidence that these are so-called Balmer-dominated'' filaments, which are signatures of non-radiative, collisionless shocks. Comparison of the filaments with radio and X-ray images shows large scale similarities with various interesting small scale differences between the various bands.