| タイトル | A Chandra X-Ray Survey of Ejecta in the Cassiopeia A Supernova Remnant |
| 本文（外部サイト） | http://hdl.handle.net/2060/20110013487 |
| 著者（英） | Laming, J. Martin; Hwang, Una |
| 著者所属（英） | Johns Hopkins Univ. |
| 発行日 | 2011-01-01 |
| 言語 | eng |
| 内容記述 | We present a survey of the X-ray emitting ejecta in the Cassiopeia A supernova remnant based on an extensive analysis of over 6000 spectral regions extracted on 2.5-10" angular scales using the Chandra 1 Ms observation. We interpret these results in the context of hydrodynamical models for the evolution of the remnant. The distributions of fitted temperature and ionization age are highly peaked and suggest that the ejecta were subjected to multiple secondary shocks. Based on the fitted emission measure and element abundances, and an estimate of the emitting volume, we derive masses for the X-ray emitting ejecta as well as showing the distribution of the mass of various elements over the remnant. The total shocked Fe mass appears to be roughly 0.14 Solar Mass, which accounts for nearly all of the mass expected in Fe ejecta. We find two populations of Fe ejecta, that associated with normal Si-burning and that associated with alpha-rich freeze-out, with a mass ratio of approximately 2:1. Surprisingly, essentially all of this Fe (both components) is well outside the central regions of the SNR, presumably having been ejected by hydrodynamic instabilities during the explosion. We discuss this, and its implications for the neutron star kick. |
| NASA分類 | Solar Physics |
| レポートNO | GSFC,JA.4520.2011 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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