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Using the unprecedented spectral resolution of the reflection gratingspectrometer (RGS) onboard XMM-Newton, we reveal dynamics of X-ray--emittingejecta in the oxygen-rich supernova remnant Puppis A. The RGS spectrum showsprominent K-shell lines, including O VII He_alpha forbidden and resonance, OVIII Ly_alpha, O VIII Ly_beta, and Ne IX He_alpha resonance, from an ejectaknot positionally coincident with an optical oxygen-rich filament (theso-called Omega filament in the northeast of the remnant). We find that theline centroids are blueshifted by 1480+/-140+/-60 km/s (the first and secondterm errors are measurement and calibration uncertainties, respectively), whichis fully consistent with that of the optical Omega filament. Line broadening at654 eV (corresponding to O VIII Ly_alpha) is obtained to be less than ~0.9 eV,indicating an oxygen temperature of less than ~30 keV. Analysis of XMM-NewtonMOS spectra shows an electron temperature of ~0.8 keV and an ionizationtimescale of ~2e10 cm^-3 s. We show that the oxygen and electron temperaturesas well as the ionization timescale can be reconciled if the ejecta knot washeated by a collisionless shock whose velocity is ~600-1200 km/s and wassubsequently equilibrated due to Coulomb interactions. The RGS spectrum alsoshows relatively weak K-shell lines of another ejecta feature located near thenortheastern edge of the remnant, from which we measure redward Dopplervelocities of 650+/-70+/-60 km/s.

Dynamics of X-Ray-Emitting Ejecta in the Oxygen-Rich Supernova Remnant Puppis A Revealed by the XMM-Newton RGS