论文标题
内磁盘中超新星残留物的距离
Distances to the Supernova Remnants in the Inner Disk
论文作者
论文摘要
超新星残留物（SNR）的距离测量至关重要。准确估计物理大小，灰尘质量和SNR的其他特性，主要取决于准确的距离测量值。但是，确定SNR距离仍然是一项艰巨的任务。红色团恒星（RCS）有很长的历史被用作标准蜡烛。在这项工作中，我们将RCS作为示踪剂，以确定内部磁盘中一大批SNR的距离。我们首先根据近红外（IR）颜色磁性图（CMD）选择RC恒星。然后，计算RC恒星的距离和灭绝。为了扩展可测量的距离范围，我们将2MASS调查的近IR光度数据与更深的UKIDS和VVV调查相结合。在Gaia视差的帮助下，我们还去除了包括矮人和巨人在内的污染物。由于SN爆炸会压缩周围的星际介质，因此SNR区域将变得更密集，并且比周围环境更高。然后，SNR的距离被灭绝及其梯度高于环境介质的位置所识别。银河内部磁盘中总共有63个SNRS的距离，并分为三个级别A，B和C，可靠性降低。用可靠性A或B很好地确定了43个SNR的距离。SNR的直径和尘埃质量是通过获得的距离和消光估计的。
Distance measurements of supernova remnants (SNRs) are essential and important. Accurate estimates of physical size, dust masses, and some other properties of SNRs depend critically on accurate distance measurements. However, the determination of SNR distances is still a tough task. Red clump stars (RCs) have a long history been used as standard candles. In this work, we take RCs as tracers to determine the distances to a large group of SNRs in the inner disk. We first select RC stars based on the near-infrared (IR) color-magnitude diagram (CMD). Then, the distance to and extinction of RC stars are calculated. To extend the measurable range of distance, we combine near-IR photometric data from the 2MASS survey with the deeper UKIDSS and VVV surveys. With the help of the Gaia parallaxes, we also remove contaminants including dwarfs and giants. Because an SN explosion compresses the surrounding interstellar medium, the SNR region would become denser and exhibit higher extinction than the surroundings. The distance of a SNR is then recognized by the position where the extinction and its gradient is higher than that of the ambient medium. A total of 63 SNRs' distances in the Galactic inner disk are determined and divided into three Levels A, B, and C with decreasing reliability. The distances to 43 SNRs are well determined with reliability A or B. The diameters and dust masses of SNRs are estimated with the obtained distance and extinction.
