期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 315, 期 3, 页码 611-621出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2000.03434.x
关键词
line : profiles; stars : general; ISM : clouds; ISM : individual : Coalsack
The interstellar Na I D absorption-line profiles observed for 15 stars with lines of sight towards the Southern Coalsack are analysed. The method of profile fitting was used in an attempt to determine column densities, linewidths and velocities for the individual interstellar clouds contributing to the observed absorption lines. In common, the observed spectra show a prominent component which is probably associated with the nearest absorbing material composing the Coalsack. The obtained spatial velocity distribution shows great similarity with earlier results from CO emission. In addition, the Na I D data reveal evidence for the existence of two or three other structures with radial velocities of about -22, -33 and -40 km s(-1). Such components may be the counterparts of interstellar structures observed in diffuse H alpha and CO emission. The assumption that at least one of these components originated in the Carina arm imposes similar to 0.9-1.0 kpc as the maximum distance to the near side of that arm.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据