2015/03/31 by M. Miceli, S. Sciortino, E. Troja +1
Physics and Astronomy · #Astronomy #Astrophysics #Ejecta #Geology #Laser-Plasma Interactions and Diagnostics #Materials science #Metallurgy #Nuclear Physics and Applications #Optics #Physics #Remote sensing #Spatial distribution #Supernova #Titanium #X-ray #X-ray Spectroscopy and Fluorescence Analysis #astro-ph.HE
paper · pdf · doi:10.1088/0004-637x/805/2/120
Accepted for publication in ApJ
arxiv created 2015/03/31 · openalex publication_date 2015/05/27 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Young supernova remnants (SNRs) show characteristic ejecta-dominated X-ray emission that allows us to probe the products of explosive nucleosynthesis processes and to ascertain important information about the physics of supernova explosions. Hard X-ray observations have recently revealed the presence of the radioactive decay lines of 44 Ti at ∼67.9 and ∼78.4 keV in Tycho's SNR. Here, we analyze a set of XMM-Newton archive observations of Tycho's SNR. We produce equivalent width (EW) maps of the Fe K and Ca xix emission lines and find indications for a stratification of the abundances of these elements and significant anisotropies. We then perform spatially resolved spectral analysis by identifying five different regions characterized by high/low values of the Fe K EW. We find that the spatial distribution of the Fe K emission is correlated with that of Cr xxii . We also detect the Ti K line complex in the spectra extracted from the two regions with the highest values of Fe and Cr EWs. The Ti line emission remains undetected in regions where Fe and Cr EWs are low. Our results indicate that the post-shock Ti is spatially colocated with other iron-peak nuclei in Tycho's SNR, in agreement with the predictions of multi-D models of SNe Ia.