单氘化氨 NH2D 线高质量恒星形成区调查

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
E. A. Trofimova, I. I. Zinchenko, P. M. Zemlyanukha, M. Thomasson
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引用次数: 0

摘要

本次调查是我们对氘化分子谱线中高质恒星形成区研究的继续,其第一批结果发表于[1]。本文介绍了利用瑞典昂萨拉空间天文台(Onsala Space Observatory)的 20 米射电望远镜,在 85.9 千兆赫的频率下,对 50 个天体的单氘化氨 NH2D \(1_{{11}}^{s}{-} 1_{{01}}^{a}\) 正交修饰线的观测结果。在 29 个源中探测到了这条线。对所获数据的分析,以及根据独立估算得出的调查来源中的气体密度明显低于 NH2D 转变的临界密度这一事实,都表明 NH2D 受到了非 LTE 激发。在非 LTE 模型的基础上,对 NH2D 分子的相对含量和氘富集程度进行了估算,并分析了这些参数对温度和速度色散的依赖关系,同时假设所有来源中的气体密度相同,并将探测极限考虑在内。在 15-50 K 的温度范围内,发现 NH2D 相对丰度与动力学温度之间存在反相关关系。同时,在所采用的假设条件下,没有观察到现有化学模型所预测的 NH2D/NH3 丰度比随温度升高而显著降低的现象。氨的主要同位素NH(_{3}\)的相对含量与速度弥散之间也存在反相关关系,而在同一温度范围内,与源的动力学温度之间没有发现统计学上的显著相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Survey of High-Mass Star Forming Regions in the Line of Singly Deuterated Ammonia NH2D

A Survey of High-Mass Star Forming Regions in the Line of Singly Deuterated Ammonia NH2D

The present survey represents a continuation of our study of high mass star forming regions in the lines of deuterated molecules, the first results of which were published in [1]. This paper present the results of observations of 50 objects in the line of ortho modification of singly deuterated ammonia NH2D \(1_{{11}}^{s}{-} 1_{{01}}^{a}\) at a frequency of 85.9 GHz, carried out using the 20-m radio telescope of the Onsala Space Observatory (Sweden). This line is detected in 29 sources. The analysis of obtained data, as well as the fact that the gas density in the investigated sources, according to independent estimates, is significantly lower than the critical density for this NH2D transition, indicate non-LTE excitation of NH2D. Based on non-LTE modeling, estimates of the relative content of the NH2D molecule and the degree of deuterium enrichment were obtain, and the dependencies of these parameters on temperature and velocity dispersion were analyzed with and without taking into account detection limits assuming the same gas density in all sources. An anti-correlation between the NH2D relative abundances and the kinetic temperature is revealed in a temperature range of 15–50 K. At the same time, a significant decrease in the ratio of the NH2D/NH3 abundances with increasing temperature, predicted by the available chemical models, is not observed under the adopted assumptions. An anti-correlation was also revealed between the relative content of the main isotopologue of ammonia NH\(_{3}\) and the velocity dispersion, while no statistically significant correlation with the kinetic temperature of sources in the same temperature range was found.

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来源期刊
Astronomy Reports
Astronomy Reports 地学天文-天文与天体物理
CiteScore
1.40
自引率
20.00%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Astronomy Reports is an international peer reviewed journal that publishes original papers on astronomical topics, including theoretical and observational astrophysics, physics of the Sun, planetary astrophysics, radio astronomy, stellar astronomy, celestial mechanics, and astronomy methods and instrumentation.
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