标题： 铅笔星云（RCW 37）的运动学及其与年轻版的维拉超新星遗迹RX J0852.0-4622的关联 显示英文标题

标题： Kinematics of the Pencil Nebula (RCW 37) and its association with the young Vela supernova remnant RX J0852.0-4622

摘要： 研究了Pencil星云（RCW 37, NGC 2736）、Vela X射线碎片D/D'以及最近发现的新X射线超新星遗迹（RX J0852.0-4622）之间的关联。 最近发表的关于D/D'的Chandra图像与RCW 37的光学图像进行了比较，确认了这两个天体之间存在密切联系。 展示了通过这个不寻常的光学星云的一条扩展狭缝位置所获得的RCW 37的新光学谱线轮廓。 这些轮廓揭示了一个部分速度椭圆，膨胀速度约为120公里/秒。 考虑了星云起源的各种场景，并回顾了与RX J0852.0-4622有联系的证据。 类似蟹状星云和DEM34a超新星遗迹中的气体漏斗不能排除，但更可能的解释是一种“波浪状薄片”负责。 我们建议RX J0852.0-4622位于较老且更大的Vela超新星遗迹内，并且来自RX J0852.0-4622的部分X射线气体已经与较老遗迹的密集HI壁相撞。 这导致了光学发射的形态和速度结构，并解释了超新星遗迹这一部分的不寻常X射线发射。 如果我们的假设正确，基于旧Vela超新星遗迹距离的最新测量值，可以预测出250 ± 30 pc的距离。 这距离文献中引用的距离范围下限相符，从而证实了这个年轻附近超新星遗迹的不寻常性质。 显示英文摘要

摘要： The association between the Pencil nebula (RCW 37, NGC 2736), the Vela X-ray fragment D/D' and the recently discovered new X-ray supernova remnant (RX J0852.0-4622) in Vela is investigated. Recently published Chandra images of D/D' are compared with optical images of RCW 37 and confirm the close association of the two objects. New optical line profiles of RCW 37 from an extended slit position passing through this unusual optical nebula are presented. They reveal a partial velocity ellipse with expansion velocities of around 120 km/s. Various scenarios for the origin of the nebula are considered and the evidence of a link with RX J0852.0-4622 is reviewed. A funnel of gas similar to those in the Crab and DEM34a SNRs is not ruled out but a more plausible explanation may be that a `wavy sheet' is responsible. We suggest that RX J0852.0-4622 is located within the older larger Vela SNR and that some of the X-ray gas from RX J0852.0-4622 has collided with the dense HI wall of the older remnant. This gives rise to the morphology and velocity structure of the optical emission and explains the unusual X-ray emission from this portion of the supernova remnant. If our hypothesis is correct, a distance prediction of 250 +/- 30 pc can be made, based on recent measurements of the distance to the old Vela SNR. This is at the lower end of the range of distances quoted in the literature would confirm unusual nature of this young nearby supernova remnant.