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We show that the expansion of ejecta in Tycho's supernova remnant (SNR) isconsistent with a spherically symmetric shell, based on Suzaku measurements ofthe Doppler broadened X-ray emission lines. All the strong K_alpha lineemission show broader widths at the center than at the rim, while the centroidenergies are constant across the remnant (except for Ca). This is the patternexpected for Doppler broadening due to expansion of the SNR ejecta in aspherical shell. To determine the expansion velocities of the ejecta, weapplied a model for each emission line feature having two Gaussian componentsseparately representing red- and blue-shifted gas, and inferred the Dopplervelocity difference between these two components directly from the fittedcentroid energy difference. Taking into account the effect of projecting athree-dimensional shell to the plane of the detector, we derived averagespherical expansion velocities independently for the K_alpha emission of Si, S,Ar, and Fe, and K_beta of Si. We found that the expansion velocities of Si, S,and Ar ejecta of 4700+/-100 km/s are distinctly higher than that obtained fromFe K_alpha emission, 4000+/-300 km/s, which is consistent with segregation ofthe Fe in the inner ejecta. Combining the observed ejecta velocities with theejecta proper-motion measurements by Chandra, we derived a distance to theTycho's SNR of 4+/-1 kpc.

Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission