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arXiv 2009.06291astro-ph.GA
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在高质量恒星形成区寻找OH 6035 MHz谱线

A search for the OH 6035 MHz line in high-mass star-forming regions

M. Szymczak, P. Wolak, A. Bartkiewicz, M. Aramowicz, M. Durjasz

备注：
8 pages, 6 figures
发表信息：
A&A 642, A145 (2020)
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摘要：

在高质量年轻恒星天体（HMYSO）环境中探测到的OH脉泽激发态对于提高我们对这些天体物理条件的理解具有重要意义，同时也提供了有关其磁场的信息。我们的目标是寻找激发态OH 6035 MHz脉泽发射HMYSO可能已经逃脱检测在以前的调查或从未搜索。用托伦32米射电望远镜在6035 MHz OH跃迁处观测了一个来自6668 MHz甲醇脉泽谱线非目标观测的HMYSO样品。在OH 6031 MHz谱线中观察到6035 MHz的检测。三分之二的侦查在两年期间至少观察了三次。在445个目标中，有37个目标是在6035兆赫上探测到的，其中包括7个新发现的目标。在10个6035 MHz源中检测到6031 MHz线，其中一个以前没有报道过。所有新探测到的源都是微弱的，峰值通量密度低于4焦耳，并在4至20个月的时间尺度上显示出显着或高度的变化。在三个新的来源中确定的塞曼对候选人意味着磁场强度为2至11 mG。我们的光谱与$\sim$ 10年前获得的光谱比较表明不同程度的变异性，但在$\sim$ 25年的时间尺度上，变异性指数普遍增加，通常伴随着轮廓形状的显著变化。

英文摘要：

The excited states of OH masers detected in the environment of high-mass young stellar objects (HMYSOs) are important for improving our understanding of the physical conditions of these objects and also provide information about their magnetic fields. We aim to search for excited-state OH 6035 MHz maser emission in HMYSOs which might have escaped detection in previous surveys or were never searched for. A sample of HMYSOs derived from untargeted surveys of the 6668 MHz methanol maser line was observed at 6035 MHz OH transition with the Torun 32 m radio telescope. The 6035 MHz detections were observed in the OH 6031 MHz line. Two-thirds of the detections were observed at least three times over a two-year period. Out of 445 targets, 37 were detected at 6035 MHz, including seven new discoveries. The 6031 MHz line was detected towards ten 6035 MHz sources, one of which was not previously reported. All the newly detected sources are faint with the peak flux density lower than 4 Jy and show significant or high variability on timescales of 4 to 20 months. Zeeman pair candidates identified in three new sources imply a magnetic field intensity of 2 to 11 mG. Comparison of our spectra with those obtained $\sim$10 yr ago indicates different degrees of variability but there is a general increase in the variability index on an $\sim$25 yr timescale, usually accompanied by significant changes in the profile shape.

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