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Hughes (2), Koji Mori (5), Robert Petre (1), Satoru Katsuda (1), Una Hwang (1","submitted_at":"2010-01-14T15:03:21Z","abstract_excerpt":"We present X-ray proper-motion measurements of the forward shock and reverse-shocked ejecta in Tycho's supernova remnant, based on three sets of archival Chandra data taken in 2000, 2003, and 2007. We find that the proper motion of the edge of the remnant (i.e., the forward shock and protruding ejecta knots) varies from 0\".20 yr^{-1} (expansion index m=0.33, where R = t^m) to 0\".40 yr^{-1} (m=0.65) with azimuthal angle in 2000-2007 measurements, and 0\".14 yr^{-1} (m=0.26) to 0\".40 yr^{-1} (m=0.65) in 2003-2007 measurements. 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