Discovery of Fast-Moving X-Ray-Emitting Ejecta Knots in the Oxygen-Rich Supernova Remnant Puppis A

摘要: We report on the discovery of fast-moving X-ray-emitting ejecta knots in Galactic oxygen-rich supernova remnant Puppis A from XMM-Newton observations. find an X-ray knotty feature positionally coincident with O-rich optical filament blueshifted line emission located northeast A. extract spectra northern and southern regions feature. Applying a one-component nonequilibrium ionization model for two spectra, we high metal abundances relative to solar values both spectra. This fact clearly shows that originates metal-rich ejecta. In addition, is blueshifted. The Doppler velocities derived are different each other, suggesting consists close other along sight. Since knots/filaments believed be recoiled ejecta, expelled opposite direction against high-velocity central compact object, propose disclosed here also part material.