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ACCRETION DISKS AROUND CLASS 0 PROTOSTARS: THE CASE OF VLA 1623

机译:0类原星周围的增生盘:VLA 1623的情况

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摘要

Continuum emission at 220 and 355 GHz from the prototype class 0 source VLA 1623 has been detected using the James Clerk Maxwell Telescope-Caltech Submillimeter Observatory interferometer. Gaussian fits to the data place an upper limit of 70 AU on the half-width at half-maximum radius of the emission, which implies an upper limit of ~175 AU for the cutoff radius of the circumstellar disk in the system. In the context of existing collapse Models, this disk could be magnetically supported on the largest scales and have an age of ~6 X 10~4 yr, consistent with previous suggestions that class 0 sources are quite young. The innermost region of the disk within ~6 AU is likely to be in centrifugal support, which is likely large enough to provide a drive for the outflow according to current theoretical Models. Alternatively, if 175 AU corresponds to the centrifugal radius of the disk, the age of the system is ~2 X 10~5 yr, closer to age estimates for class I sources.
机译:使用James Clerk Maxwell Telescope-Caltech亚毫米天文台干涉仪检测了原型0类源VLA 1623在220和355 GHz处的连续发射。高斯拟合数据在发射半径的一半最大半径的半宽度上设置了70 AU的上限,这意味着系统中圆星盘的截止半径的上限为175 AU。在现有的坍塌模型的背景下,该磁盘可以得到最大规模的磁性支撑,其年龄为〜6 X 10〜4年,与先前的关于0级震源还很年轻的建议相一致。磁盘的最内层区域在〜6 AU之内可能处于离心支撑下,根据当前的理论模型,该区域可能足够大以为流出提供动力。或者,如果175 AU对应于圆盘的离心半径,则系统的寿命约为〜2 X 10〜5年,接近于I类源的寿命估计。

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