Spatial Distribution of X-Ray Emitting Ejecta in Tycho’s SNR: Indications of Shocked Titanium
Journal
Date Issued
2015
Author(s)
Description
We thank the anonymous referee for comments and suggestions. This paper was partially funded by the PRIN INAF 2014 grant. M.M. thanks M. Dadina for discussions about the X-IFU instrumental background.
Abstract
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 44Ti 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.
Volume
805
Issue
2
Start page
1
Issn Identifier
0004-637X
Ads BibCode
2015ApJ...805..120M
Rights
open.access
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