Spatial distribution of X-ray emitting ejecta in Tycho's SNR: indications of shocked Titanium

Abstract

Young supernova remnants show a characteristic ejecta-dominated X-ray emission that allows us to probe the products of the explosive nucleosynthesis processes and to ascertain important information about the physics of the supernova explosions. Hard X-ray observations have recently revealed the radioactive decay lines of 44Ti at ~67.9 keV and ~78.4 keV in the Tycho's SNR. We here analyze the set of XMM-Newton archive observations of the Tycho's SNR. We produce equivalent width 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 a spatially resolved spectral analysis by identifying five different regions characterized by high/low values of the Fe K equivalent width. We find that the spatial distribution of the Fe K emission is correlated with that of the Cr XXII. We also detect the Ti K-line complex in the spectra extracted from the two regions with the highest values of the Fe and Cr equivalent widths. The Ti line emissions remains undetected in regions where the Fe and Cr equivalent widths are low. Our results indicate that the post-shock Ti is spatially co-located with other iron-peak nuclei in Tycho's SNR, in agreement with the predictions of multi-D models of Type Ia supernovae.

Accepted for publication in ApJ

References in corpus (9)

• Asymmetries in core-collapse supernovae from maps of radioactive ${}^{44}$Ti in CassiopeiaA
• Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum
• Discriminating the Progenitor Type of Supernova Remnants with Iron K-Shell Emission
• The Persistence of Memory, or How the X-Ray Spectrum of SNR 0509-67.5 Reveals the Brightness of its Parent Type Ia Supernova
• The End of Amnesia: A New Method for Measuring the Metallicity of Type Ia Supernova Progenitors Using Manganese Lines in Supernova Remnants
• The X-ray emission of the supernova remnant W49B observed with XMM-Newton
• X-ray Stripes in Tycho's Supernova Remant: Synchrotron Footprints of a Nonlinear Cosmic Ray-driven Instability
• Swift/BAT detection of hard X-rays from Tycho's Supernova Remnant: Evidence for Titanium-44
• Hard X-ray emission and ${}^{44}$Ti line features of Tycho Supernova Remnant

Cited by in corpus (11)

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• A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant
• X-ray spectroscopy of the candidate AGN in Henize 2-10 and NGC 4178: Likely supernova remnants
• RGS Observations of Ejecta Knots in Tycho's Supernova Remnant
• Type Ia Supernova Models: Asymmetric Remnants and Supernova Remnant G1.9+0.3
• Discovery of Year-Scale Time Variability from Thermal X-ray Emission in Tycho's Supernova Remnant
• An Exploration of X-ray Supernova Remnants in the Milky Way and Nearby Galaxies
• Comparing the three-dimensional morphological asymmetries in the ejecta of Kepler and Tycho in X-rays
• X-ray Measurements of ${}^{44}$Ti in Four Supernova Remnants