AAS 205th Meeting, 9-13 January 2005
Session 106 SNRs and Loops
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

## [106.07] Further Investigation of

M. Theiling, M. Leising (Clemson University)

Radioactive 44Ti (\tau1/2=60y) produced in supernovae is the source for the abundance of 44Ca in our Galaxy. It is synthesized in the deepest material to be ejected by a core-collapse supernova, and so is an excellent diagnostic of the ejections process. This isotope's decay chain (44Ti \Rightarrow 44Sc \Rightarrow 44Ca) produces both gamma- and x-ray lines, including the prominently studied 1157 keV nuclear de-excitation of 44Ca. Our methods utilize the Sc K-shell photon emission from the 44Ti electron capture decay. At current resolution capabilities in x-ray satelite observations, this emission should fall within the limits of observation for young, nearby core-collapse supernovae.

Our target for investigating 44Ti production and decay via this line is SNR Casseiopeia A. Our ongoing analysis of both existing Chandra and XMM observations has established a 2\sigma upper limit for the 4.1 keV line flux of \approx3.0*10-5 \gamma/cm2s. Further, we have extended our search to a smaller regional analysis within the iron-rich regions of CasA and will report on those results as well.

Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.