SNR Kes 73和AXP 1 E 1841-045的距离和年龄
The Distance and Age of the SNR Kes 73 and AXP 1E 1841-045
摘要：
我们提供了一个新的距离估计超新星遗迹（SNR）Kes 73及其相关的异常X射线脉冲星（AXP）1 E 1841-045。本文分析了新的VLA观测的21 cm HI图象和HI吸收/发射谱，以及Kes 73和两个相邻的致密HII区（G27.276+0.148和G27.491+0.189）的13 CO发射谱。HI图像显示与Kes 73和HII区域相关的突出吸收特征。吸收出现到切点速度，给出到Kes 73的7.5 kpc的距离下限，这在以前被给出为上限。另外，G27.276+0.148和G27.491+0.189处于它们的射电复合线速度的远运动学距离处。所有三个物体在80- 90公里/秒范围内都有显著的HI发射。两个HII区在~ 84 km/s处显示出HI吸收，但在Kes 73吸收光谱中没有吸收。这意味着到Kes 73的距离上限约为9.8 kpc。这一修正后的Kes 73/ AXP 1 E 1841-045系统的较大距离导致SNR的精确年龄为500至1000年，AXP X射线光度增加了约50%。
英文摘要：
We provide a new distance estimate to the supernova remnant (SNR) Kes 73 and its associated anomalous X-ray pulsar (AXP) 1E 1841-045. 21 cm HI images and HI absorption/ emission spectra from new VLA observations, and 13CO emission spectra of Kes 73 and two adjacent compact HII regions (G27.276+0.148 and G27.491+0.189) are analyzed. The HI images show prominent absorption features associated with Kes 73 and the HII regions. The absorption appears up to the tangent point velocity giving a lower distance limit to Kes 73 of 7.5 kpc, which has previously been given as the upper limit. Also, G27.276+0.148 and G27.491+0.189 are at the far kinematic distances of their radio recombination line velocities. There is prominent HI emission in the range 80--90 km/s for all three objects. The two HII regions show HI absorption at ~ 84 km/s, but there is no absorption in the Kes 73 absorption spectrum. This implies an upper distance limit of ~ 9.8 kpc to Kes 73. This corrected larger distance to Kes 73/ AXP 1E 1841-045 system leads to a refined age of the SNR of 500 to 1000 yr, and a ~ 50% larger AXP X-ray luminosity.
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