Observations of H3+ in Dense Molecular Clouds
Observations of H3+ in Dense Molecular Clouds
复制标题
稠密分子云中 H3 的观测
DOI：
10.1086/307637
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
T. Oka
中科院分区：
文献类型：
--
作者：
B. McCall;T. Geballe;K. Hinkle;T. Oka
利用红外吸收光谱法，沿着视线，在稠密分子云中探测到六个红外源：AFGL 2136、W33 A、Mon R2 IRS 3、AFGL 961 E、AFGL 2591和AFGL 490。H+3的柱密度上限报告了另外9个来源。对Mon R2 IRS 3和AFGL 961 E的CO柱密度已经确定从CO的第一泛音线的观测。对于H+3被检测到的6个源，一个简单的H+3化学模型已被用来与来自红外CO测量的H2柱密度一起估计柱长度，平均数密度和分子云的温度。导出的柱长为秒差距的数量级，数密度为104-105 cm-3，温度为~25-50 K。
H+3 has been detected using infrared absorption spectroscopy along the lines of sight to six infrared sources in dense molecular clouds: AFGL 2136, W33A, Mon R2 IRS 3, AFGL 961E, AFGL 2591, and AFGL 490. Upper limits to the column densities of H+3 are reported for an additional nine sources. The column densities of CO toward Mon R2 IRS 3 and AFGL 961E have been determined from observations of the first-overtone lines of CO. For the six sources toward which H+3 was detected, a simple model of H+3 chemistry has been used together with column densities of H2 derived from infrared CO measurements to estimate column lengths, mean number densities, and temperatures of molecular clouds. The derived column lengths are on the order of a parsec, the number densities are 104-105 cm-3, and the temperatures are ~25-50 K.