Hot and cold gas toward young stellar objects
Hot and cold gas toward young stellar objects
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热气体和冷气体流向年轻恒星
DOI：
10.1086/169365
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
K. Belcourt
中科院分区：
文献类型：
--
作者：
G. F. Mitchell;J. Maillard;M. Allen;R. Beer;K. Belcourt
给出了7个嵌入式红外源W3 IRS 5、S140 IRS 1、NGC 7538 IRS 1、NGC 7538 IRS 9、GL 2136、LkH-α 101和MWC 349 A的高分辨率M波段光谱，并将数据与先前发表的W33 A和GL 2591的工作相结合。在所有九个来源中都可以看到冷CO，温度从11 K到66 K。提出了冷CO的柱密度。在9个天体中的8个天体上可以看到热气体，温度从120 K到1010 K。得到了新的热气体密度下限。朝向GL 2591、GL 2136、W3 IRS 5和S140 IRS 1的热气体可能非常靠近中心源，并通过气体-颗粒碰撞被加热。在硅酸盐功能的光学深度是强烈相关的（C-13）O柱密度，证实硅酸盐光学深度是一个有用的措施，气柱密度。固体与气体的CO的比例，获得了七个来源。参考文献43篇。
High-resolution M band spectra are presented for the seven embedded IR sources W3 IRS 5, S140 IRS1, NGC 7538 IRS 1, NGC 7538 IRS 9, GL 2136, LkH-alpha 101, and MWC 349A, and the data are combined with previously published work for W33A and GL 2591. Cold CO is seen toward all nine sources, with temperatures from 11 K to 66 K. Column densities of cold CO are presented. Hot gas is seen toward eight of the nine objects with temperatures from 120 K to 1010 K. New lower limits to the hot gas density are obtained. The hot gas toward GL 2591, GL 2136, W3 IRS 5, and S140 IRS 1 is probably very near the central source and heated via gas-grain collisions. The optical depth in the silicate feature is strongly correlated with the (C-13)O column density, confirming that silicate optical depth is a useful measure of gas column density. The ratio of solid-to-gaseous CO is obtained for seven sources. 43 refs.