论文标题
蜻蜓星云的高分辨率无线电研究
High-Resolution Radio Study of the Dragonfly Nebula
论文作者
论文摘要
由年轻的Pulsar J2021 $+$ 3651提供动力的蜻蜓星云（G75.2 $+$ 0.1）是罕见的脉冲星星云（PWN），显示了双托里和极地喷气机，由X射线中的弓箭结构包含。我们介绍了该来源的新无线电观察结果，该源是6 GHz的非常大的阵列（VLA）。无线电PWN的总体大小约为X射线的两倍，由西南部的一个明亮的主体区域组成，东北地区狭窄而淡淡的桥梁区域以及介于两者之间的黑暗间隙。星云显示的无线电光谱比典型的PWN柔软得多。这可能是由于RAM压力压缩而导致的，因为系统在星际介质（ISM）中轻度地传播。我们的两极分化图揭示了一个高度有序且复杂的$ B $场结构。这可以通过脉冲星运动扭曲的环形场来解释。
The Dragonfly Nebula (G75.2$+$0.1) powered by the young pulsar J2021$+$3651 is a rare pulsar wind nebula (PWN) that shows double tori and polar jets enclosed by a bow-shock structure in X-rays. We present new radio observations of this source taken with the Very Large Array (VLA) at 6 GHz. The radio PWN has an overall size about two times as large as the X-ray counterpart, consisting of a bright main body region in the southwest, a narrow and fainter bridge region in the northeast, and a dark gap in between. The nebula shows a radio spectrum much softer than that of a typical PWN. This could be resulting from compression by the ram pressure as the system travels mildly supersonically in the interstellar medium (ISM). Our polarization maps reveal a highly ordered and complex $B$-field structure. This can be explained by a toroidal field distorted by the pulsar motion.
