A deep Chandra observation of Kepler's supernova remnant: A type IA event with circumstellar interaction

作者：Reynolds Stephen P^*; Borkowski Kazimierz J; Hwang Una; Hughes John P; Badenes Carles; Laming J M; Blondin J M

来源：Astrophysical Journal, 2007, 668(2): L135-L138.

DOI：10.1086/522830

• ISM : individual (G4.5+6.8 (SN 1604))
• supernova remnants
• supernovae : general
• X-rays : ISM

We present initial results of a 750 ks Chandra observation of the remnant of Kepler's supernova of AD 1604. The strength and prominence of iron emission, together with the absence of O-rich ejecta, demonstrate that Kepler resulted from a thermonuclear supernova, even though evidence for circumstellar interaction is also strong. We have analyzed spectra of over 100 small regions, and find that they fall into three classes. ( 1) The vast majority show Fe L emission between 0.7 and 1 keV and Si and S K alpha emission; we associate these with shocked ejecta. A few of these are found at or beyond the mean blast wave radius. (2) A very few regions show solar O/Fe abundance ratios; these we associate with shocked circumstellar medium ( CSM). Otherwise O is scarce. ( 3) A few regions are dominated by continuum, probably synchrotron radiation. Finally, we find no central point source, with a limit similar to 100 times fainter than the central object in Cas A. The evidence that the blast wave is interacting with CSM may indicate a Ia explosion in a more massive progenitor.

• 出版日期2007-10-20