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arXiv 0803.4011astro-ph
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钱德拉揭示的开普勒超新星遗迹的动力学

The Kinematics of Kepler's Supernova Remnant as revealed by Chandra

J. Vink

备注：
Accepted for publication in ApJ. This new version is the accepted version, which differs mainly in the discussion section
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摘要：

我确定SN 1604（开普勒的超新星）的超新星遗迹的膨胀基于档案钱德拉ACIS-S在2000年和2006年的观测。测量是在几个不同的能带中进行的，并对整个残骸和六个单独的扇区进行了测量。平均膨胀参数表明残骸以$r \propto t^{0.5}$形式膨胀，但残骸的不同部分存在显著差异：明亮的西北部分以$r \propto t^{0.35}$形式膨胀，而残骸的其余部分则以$r \propto t^{0.6}$形式膨胀。后者是一致的爆炸，其中喷出物的外部有一个负幂律斜率密度（$ρ\propto v^{-n}$）的$n=7$，或与指数密度分布（$ρ\propto \exp(-v/v_e)$）。南部区域的膨胀参数与激波半径一起表明，SN 1604在4千秒差距距离上的爆炸能量值相当低（<5E 50 erg）。距离越大，爆炸能量越高，这与计算结果一致。残骸东部的暗条主要由X射线同步辐射控制，它似乎标志着一个具有快速冲击波速度$r \propto t^{0.7}$的区域，对应于到SN 1604的距离为4 kpc的冲击波速度v= 4200 km/s。这与X射线同步辐射需要超过2000 km/s的激波速度的想法一致。基于X射线的膨胀测量报告的结果是一致的基础上的光学和无线电测量，但不同意以前的X射线测量的基础上ROSAT和爱因斯坦观测。

英文摘要：

I determine the expansion of the supernova remnant of SN1604 (Kepler's supernova) based on archival Chandra ACIS-S observations made in 2000 and 2006. The measurements were done in several distinct energy bands, and were made for the remnant as a whole, and for six individual sectors. The average expansion parameter indicates that the remnant expands as $r \propto t^{0.5}$, but there are significant differences in different parts of the remnant: the bright northwestern part expands as $r \propto t^{0.35}$, whereas the rest of the remnant's expansion shows an expansion $r \propto t^{0.6}$. The latter is consistent with an explosion in which the outer part of the ejecta has a negative power law slope for density ($ρ\propto v^{-n}$) of $n=7$, or with an exponential density profile($ρ\propto \exp(-v/v_e)$). The expansion parameter in the southern region, in conjunction with the shock radius, indicate a rather low value (<5E50 erg) for the explosion energy of SN1604 for a distance of 4 kpc. An higher explosion energy is consistent with the results, if the distance is larger. The filament in the eastern part of the remnant, which is dominated by X-ray synchrotron radiation seems to mark a region with a fast shock speed $r \propto t^{0.7}$, corresponding to a shock velocity of v= 4200 km/s, for a distance to SN1604 of 4 kpc. This is consistent with the idea that X-ray synchrotron emission requires shock velocities in excess of ~2000 km/s. The X-ray based expansion measurements reported are consistent with results based on optical and radio measurements, but disagree with previous X-ray measurements based on ROSAT and Einstein observations.

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