Spectral Evolution in Cassiopeia A Observed with Chandra's High Energy Transmission Grating

Astronomy and Astrophysics – Astronomy

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Scientific paper

We obtained a new observation of Cassiopeia A with the High Energy Transmission Grating on board the Chandra X-ray Observatory in April 2010 in order to compare with the first observation taken in May 2001 and search for evolution in the spectral lines. Our preliminary analysis of the 17 regions measured in 2001 shows mostly small changes in the Si XIII f/r ratio and Si H/He ratio, however, one region showed a significant change in the Si H/He ratio The H/He ratios have typically increased - indicating increasing ionization - or stayed the same. The velocities of the regions have all decreased or remained the same and the speed changes may be correlated with the Si XIII f/r ratio. We will perform an analysis of the ACIS data on these regions to obtain values of temperature and ionization age and we will compare the evolution we actually observe with the changes expected from evolutionary models.

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