在几个星系方向的十米碳无线电重组线的观测。第1部分。实验研究

Q4 Physics and Astronomy
Y. Vasylkivskyi, O. Konovalenko, S. Stepkin
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引用次数: 0

摘要

主题和目的。自从十米碳无线电复合线(RRLs)在四十多年前首次被探测到以来,它们极大地扩展了我们对冷稀薄星际介质(ISM)的物理、运动学和化学知识。大量这样的谱线已经被观测到朝向各种银河系射电源。本文描述了我们在银河方向上的十米碳RRLs的研究,如S140发射星云和被称为GSH 139-03-69超级壳的大体积冷中性氢的视线。方法和方法论。利用UTR-2射电望远镜和多通道数字相关器进行了以26 MHz为中心的1 MHz频段内的观测。UTR-2仍然是世界上最大和最灵敏的低频射电望远镜。结果。我们报道了从S140星云方向的介质中探测到十米碳RRL系列C627α - C637α。估计了RRL形成区的范围。认为S140方向的RRLs是在瞄准线上的局部ISM上形成的。rrl形成区域可能与银道面无所不在的弥漫中性HI气体有关,而不是与S140星云本身有关。在GSH 139-03-69超级壳上,也发现了十米的RRLs。同样,它们显然是来自视线附近的局部介质。然而,光谱中包含一个RRL成分,对应于ISM中GSH 139-03-69本身的冷气体的吸收。结论。所获得的结果表明,十米碳RRLs不仅有可能用于冷ISM探测,而且可以作为研究银河系中极冷氢HI的大型配合物的良好辅助工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observations of decameter carbon radio recombination lines in several galactic directions. Part 1. Experimental study
Subject and Purpose. Since decameter carbon radio recombination lines (RRLs) were detected for the first time more than forty years ago, they have significantly extended our knowledge of the physics, kinematics and chemistry of the cold rarefied interstellar medium (ISM). A large number of these lines have been observed towards various Galactic radio sources. The present paper describes our studies of decameter carbon RRLs in such Galactic directions as the sight-lines to the S140 emission nebula and to the large volume of cold neutral hydrogen known as the GSH 139-03-69 super shell. Methods and Methodology. Observations within a 1-MHz frequency band centered at 26 MHz were performed using the UTR-2 radio telescope and a multi-channel digital correlator. The UTR-2 is still the world largest and the most sensitive low-frequency radio telescope. Results.We report the detection of decameter carbon RRL series C627α – C637α from the medium lying towards the S140 nebula. The extents of RRL forming regions have been estimated. It is suggested that RRLs in the S140 direction are formed in the local ISM lying along the line of sight. The RRL-forming region is probably associated with omnipresent diffuse neutral HI gas in the Galactic plane rather than with S140 nebula itself. Toward the GSH 139-03-69 super shell, decameter RRLs have been detected as well. Likewise, they apparently originate from the local medium lying along the sight-line. Yet, the spectrum contains a RRL component corresponding to the absorption of the cold gas of the GSH 139-03-69 itself in the ISM. Conclusions. The obtained results indicate great possibilities of decameter carbon RRLs not only for cold ISM probing but also for making a good auxiliary tool for studying large complexes of extremely cold hydrogen HI in the Galaxy.
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来源期刊
Radio Physics and Radio Astronomy
Radio Physics and Radio Astronomy Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
0.60
自引率
0.00%
发文量
18
审稿时长
8 weeks
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