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Low-mass star-forming cores in the GF 9 filament

机译：GF 9灯丝中的低质量恒星形成芯

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摘要

We carried out an unbiased mapping survey of dense molecular cloud cores traced by the NH3 (1,1) and (2,2) inversion lines in the GF 9 filament, which contains an extremely young low-mass protostar, GF 9-2 (2006, ApJ, 653, 1369). The survey was conducted using the Nobeyama 45 m telescope over a region of similar to 1.degrees 5 x 1 degrees with an angular resolution of 73 ''. The large-scale map revealed that the filament contains at least 7 dense cores, as well as 3 possible ones, located at regular intervals of similar to 0.9 pc. Our analysis shows that these cores have kinetic temperatures of less than or similar to 10 K and LTE-masses of 1.8-82M(circle dot), which makes them typical sites of low-mass star formation. All of the identified cores are likely to be gravitationally unstable, because their LTE-masses are larger than their virial masses. Since the LTE-masses and separations of the cores are consistent with the Jeans masses and lengths, respectively, for the low-density ambient gas, we argue that the identified cores formed via the gravitational fragmentation of the natal filamentary cloud.
机译：我们对GF 9细丝中的NH3（1,1）和（2,2）反转线追踪的致密分子云核心进行了无偏图测绘，其中GF 9细丝包含极年轻的低质量原恒星GF 9-2（ 2006，ApJ，653，1369）。这项调查是使用Nobeyama 45 m望远镜在一个类似于1度5 x 1度的区域内进行的，其角分辨率为73英寸。大规模图表明，长丝包含至少7个密实芯，以及3个可能的芯，以规则间隔（约0.9 pc）定位。我们的分析表明，这些核心的动力学温度小于或等于10 K，LTE质量为1.8-82M（圆点），这使其成为低质量恒星形成的典型位置。所有已确定的核心很可能在重力上不稳定，因为它们的LTE质量大于其病毒质量。由于低密度环境气体的LTE质量和芯的分离分别与Jeans的质量和长度一致，因此我们认为已识别的芯是通过新生丝状云的重力碎裂形成的。

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