Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3302b&link_type=abstract
American Astronomical Society, HEAD meeting #12, #33.02
Other
Scientific paper
Though SN 1604 (Kepler's Supernova Remnant) was determined to have a Type Ia progenitor, it also possesses a circumstellar medium (CSM), which is more characteristic of a core-collapse remnant. Using a 750 ks Chandra X-ray Observation of SN 1604, we have separated the swept-up CSM from ejected material by dividing the remnant into about 4000 segments, plotting each as a point in a four-dimensional space of flux ratios, and searching for clusters of segments of similar spectral properties using Gaussian Mixture Models. CSM was identified from the presence of a magnesium line (not expected in ejecta). Spectral fits to the magnesium feature in regions containing the CSM revealed that approximately half a solar mass of CSM material is contained within SN 1604. This material is distributed in a bright northern rim which contains about 75% of the total CSM, a central band which contains about 10%, and various other smaller regions. Of the material in the central band, about 40% is concentrated in the northwest corner. Though the northern rim might be expected to show CSM (brighter as a result of the progenitor's northward movement), the central band is harder to understand. This band also shows optical nonradiative shocks with Doppler shifts indicating material on both front and back faces of the remnant. The central emission band suggests that material shed by the progenitor system was concentrated in a disk-like structure (with axis roughly in the plane of the sky) at the time of the explosion. We are investigating the implications of this picture and will present results of hydrodynamic simulations constrained by our mass determinations.
Blondin John M.
Borkowski Kazimierz J.
Burkey Mary
Reynolds Stephen P.
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