A Cr-K emission line survey in young supernova remnants with Chandra

Details A Cr-K emission line survey in young supernova remnants with Chandra A Cr-K emission line survey in young supernova remnants with Chandra

2008-10-26

arxiv.org/abs/0810.4687v1

Astrophys.J.692:894-901,2009

Astronomy and Astrophysics

Astrophysics

20 pages, 6 figures, accepted by ApJ

Scientific paper

10.1088/0004-637X/692/1/894

We performed a Cr-K emission line survey in young supernova remnants (SNRs) with the Chandra archival data. Our sample includes W49B, Cas A, Tycho and Kepler. We confirmed the existence of the Cr line in W49B and discovered this emission line in the other three SNRs. The line center energies, equivalent widths (EWs) and fluxes of the Cr lines are given. The Cr in Cas A is in a high ionization state while that in Tycho and Kepler is in a much lower one. We find a good positive correlation between Cr and Fe line center energies, suggesting a common origin of Cr and Fe in the nucleosynthesis, which is consistent with the theoretical predictions. We propose that the EW ratio between Cr and Fe can be used as a supplementary constraint on the progenitors' properties and the explosion mechanism.

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