Abstract

We present the observation results of the star forming region NGC 2071 in the 1.35-cm H₂O line and 18-cm OH lines obtained with the 22-m radio telescope in Pushchino (Russia) and the large radio telescope in Nançay (France), respectively. The catalog of H₂O maser emission spectra from December 2010 to January 2020 is given. The total flux variability for the entire monitoring period (1979–2020) has two activity cycles of close duration (approximately 20 years), which were accompanied by strong flares at intervals of one to four years. It is shown that the medium for the generation of H₂O maser emission is greatly fragmented and contains small-scale turbulent motions of matter. The observed drift and radial velocity jumps of the H₂O emission features can be a consequence of the complex, inhomogeneous structure of the maser emission regions. OH emission in the 1665 and 1667 MHz main lines and in the 1612 MHz satellite line in the radial velocity range of 7–12 km/s is broadband. The ratio of intensities differs from equilibrium. The substantiation of the observed ratio between the intensities of this emission and absorption in the 1720 MHz line is given. OH maser emission was observed in 2007 in the left circular polarization in the 1667 MHz line at 13.02 and 13.55 km/s with a flux density of ~0.3 Jy and a width of ~0.25 km/s for each of the velocities.

中文翻译：

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NGC 2071活跃星形成区中OH和H 2 O Maser排放的演变

摘要

我们介绍了在普希金诺（俄罗斯）用22米射电望远镜和在南桑（法国）用大型射电望远镜获得的1.35 cm H ₂ O线和18 cm OH线中恒星形成区域NGC 2071的观测结果。， 分别。给出了2010年12月至2020年1月H ₂ O maser发射光谱的目录。整个监测期间（1979-2020年）的总通量变化具有两个持续时间（大约20年）的活动周期，并伴有以一到四年为间隔的强耀斑。结果表明，用于产生H ₂ O maser发射的介质被极大地破碎，并包含物质的小规模湍流运动。H ₂的观测到的漂移和径向速度跳跃O发射特征可能是maser发射区域复杂，不均匀的结构的结果。1665和1667 MHz主线以及1612 MHz卫星线在径向速度范围7–12 km / s中的OH发射是宽带的。强度比不同于平衡。给出了在1720 MHz线中观察到的这种发射强度与吸收强度之比的证明。2007年在1667 MHz线的左圆极化中以13.02和13.55 km / s观测到OH maser发射，每个速度的通量密度为〜0.3 Jy，宽度为〜0.25 km / s。