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High-Resolution Observations of Water Masers in Bok Globules

机译:博克球中水激分子的高分辨率观察

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We present Very Large Array observations at 1.3 cm of several water maser detections obtained by previous single-dish studies of Bok globules in the 1988 Clemens and Barvainis (CB) catalog. We report water maser emission in CB 3 (CB 3-mm), CB 54 (IRAS 07020-1618), CB 101 (IRAS 17503-0833), and CB 232 (IRAS 21352+4307) and nondetection toward CB 65 (IRAS 16277-2332) and CB 205 (IRAS 19433+2743). These are the first reported interferometric observations of water masers in Bok globules of the CB catalog. We also present single-dish observations of millimeter and centimeter spectral lines toward CB 101 (IRAS 17503-0833) and CB 65 (IRAS 16277-2332). All the maser emission seems to be associated with star-forming regions hosting bipolar molecular outflows, except IRAS 17503-0833 in CB 101, which we suggest to be a possible Mira evolved star, and IRAS 16277-2332 in CB 65, which is of unknown nature. We have used the precise position of the maser emission to derive information about the powering source of the masers. By analyzing the spatio-kinematical distribution of the water masers, we confirm the millimeter source CB 3-mm as the most likely powering source of the CB 3 masers. We propose the near-IR source CB 232 YC1-I as the best candidate for pumping the maser emission observed in CB 232, while in CB 54 we suggest that the pumping source of the masers could be located at the position of an elongated feature observed in near-IR maps.
机译:我们通过在1988年Clemens和Barvainis(CB)目录中对Bok小球的先前单碟研究获得的几种水脉激波探测结果中,在1.3厘米处呈现了非常大的阵列观测值。我们报告了CB 3(CB 3-mm),CB 54(IRAS 07020-1618),CB 101(IRAS 17503-0833)和CB 232(IRAS 21352 + 4307)的水激射辐射以及未检测到CB 65(IRAS 16277) -2332)和CB 205(IRAS 19433 + 2743)。这些是在CB目录的Bok小球中首次发现水泡的干涉测量结果。我们还介绍了朝向CB 101(IRAS 17503-0833)和CB 65(IRAS 16277-2332)的毫米和厘米谱线的单碟观测结果。所有maser的发射似乎都与恒星形成区域相关,该区域形成了双极分子流出,但CB 101中的IRAS 17503-0833(我们建议可能是Mira演化的恒星)和CB 65中的IRAS 16277-2332(属于CB 101)未知的性质。我们已使用maser发射的精确位置来得出有关masers动力源的信息。通过分析水激射器的时空运动分布,我们确定毫米波源CB 3-mm是CB 3激射器最有可能的动力源。我们建议使用近红外光源CB 232 YC1-I作为泵浦在CB 232中观察到的maser发射的最佳候选,而在CB 54中,我们建议masers的泵浦源可以位于观察到的细长特征的位置在近红外地图中。

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