Three-dimensional velocity fields in the silicon- and sulfur-rich ejecta in the remnant of the Tycho supernova

The three-dimensional velocity structure of the shock-heated Si-rich and S-rich ejecta were reconstructed in the Tycho supernova remnant from Doppler-shifted lines.The vector components along the line of sight were restored from the spatially resolved spectral analysis of the Doppler shifts of Si XIII and S XV lines.The components in the plane of the sky were derived from analysis of the proper motion of the remnant's edge at different azimuths.This has been done by using the data of X-ray observations from Chandra observatory as well as the radio data from the Very Large Array.Differences in Doppler velocities over Tycho's SNR are of the order of thousands km/s.The speed of the ejecta on the opposite sides of the remnant as a three-dimensional object differs by 20 -30%.There are asymmetries and differences in the spatial distributions between the Si-rich and S-rich ejecta components.Specifically, the level of isotropy is higher in Si-rich plasma while the vector components directed outward of the observer are larger in S-rich plasma.This puts limitations on the level of deviation of the internal structure of the progenitor star from the ideal layered structure as well as on the level of asymmetries in the supernova explosion.