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arXiv 1604.01779astro-ph.HE
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第谷超新星遗迹膨胀速度变化的X射线和射电研究

An X-ray and Radio Study of the Varying Expansion Velocities in Tycho's Supernova Remnant

Brian J. Williams, Laura Chomiuk, John W. Hewitt, John M. Blondin, Kazimierz J. Borkowski, Parviz Ghavamian, Robert Petre, Stephen P. Reynolds

摘要:

我们提出了新获得的X射线和无线电观测第谷的超新星遗迹使用{ \it钱德拉}和卡尔G。Jansky超大型阵列分别在2015年和2013/14年。当结合这些仪器的早期观测时,我们现在有时间基线来测量X射线中12-15年和射电中30年的残余物的膨胀。残骸的大角度尺寸允许在爆炸波周边的许多位置进行适当的运动测量。我们发现,与早期的测量一致,一个明显的梯度的膨胀速度的残余物,尽管它的圆形形状。残留物西部和西南侧的自行比东部和东北侧的自行高出约两倍。我们在早期的工作中表明,这与爆炸地点从残骸的几何中心偏移有关,这是由于ISM中的密度梯度造成的,使用我们在这里报告的精确测量,我们发现这个偏移是朝向东北方向的$\sim 23"$。在这样一个圆形遗迹中,爆炸中心的偏移对在其他遗迹中寻找祖先同伴有影响。

英文摘要:

We present newly obtained X-ray and radio observations of Tycho's supernova remnant using {\it Chandra} and the Karl G. Jansky Very Large Array in 2015 and 2013/14, respectively. When combined with earlier epoch observations by these instruments, we now have time baselines for expansion measurements of the remnant of 12-15 year in the X-rays and 30 year in the radio. The remnant's large angular size allows for proper motion measurements at many locations around the periphery of the blast wave. We find, consistent with earlier measurements, a clear gradient in the expansion velocity of the remnant, despite its round shape. The proper motions on the western and southwestern sides of the remnant are about a factor of two higher than those in the east and northeast. We showed in an earlier work that this is related to an offset of the explosion site from the geometric center of the remnant due to a density gradient in the ISM, and using our refined measurements reported here, we find that this offset is $\sim 23"$ towards the northeast. An explosion center offset in such a circular remnant has implications for searches for progenitor companions in other remnants.

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