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arXiv 1107.3176astro-ph.GAastro-ph.SR
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朝向HH 80-81的激发源IRAS 18162-2048的旋转分子盘

A rotating molecular disk toward IRAS 18162-2048, the exciting source of HH 80-81

Manuel Fernández-López, Josep M. Girart, Salvador Curiel, Yolanda Gómez, Paul T. P. Ho, Nimesh Patel

摘要:

我们提出了几个分子线发射角秒和亚角秒的观测获得的亚毫米阵列(SMA)在大质量的原恒星IRAS 18162-2048,HH 80-81的激发源的方向。这些数据清楚地表明存在一个紧凑的(半径~425-850 AU)SO2结构,包裹着更紧凑的(半径~150 AU)1.4毫米尘埃排放(在以前的论文中报道)。发射空间上与突出的热射电喷流的位置一致,该喷流终止于HH 80-81和HH 80 N赫比格-哈罗天体。此外,分子发射在垂直于热射电喷流轴的方向上被拉长,这表明了一种盘状结构。我们推导出一个总的动态质量(盘状结构和原恒星)的11-15 msun。SO2谱线数据还允许我们将结构温度限制在120-160 K之间,并且体积密度> 2 × 10^9 cm-3。我们还发现,这样一个旋转的扁平系统可能是不稳定的,由于引力扰动。C17 O谱线的发射数据显示,在这个恒星形成区域内有一个致密的核心。此外,H2 CO和SO的排放出现clusterous和跟踪盘状结构,一个可能的相互作用之间的分子核心和流出,并在一定程度上,腔壁挖掘的热无线电射流。

英文摘要:

We present several molecular line emission arcsec and subarcsec observations obtained with the Submillimeter Array (SMA) in the direction of the massive protostar IRAS 18162-2048, the exciting source of HH 80-81. The data clearly indicates the presence of a compact (radius~425-850 AU) SO2 structure, enveloping the more compact (radius~150 AU) 1.4 millimeter dust emission (reported in a previous paper). The emission spatially coincides with the position of the prominent thermal radio jet which terminates at the HH 80-81 and HH 80N Herbig-Haro objects. Furthermore, the molecular emission is elongated in the direction perpendicular to the axis of the thermal radio jet, suggesting a disk-like structure. We derive a total dynamic mass (disk-like structure and protostar) of 11-15 msun. The SO2 spectral line data also allow us to constrain the structure temperature between 120-160 K and the volume density > 2x10^9 cm-3. We also find that such a rotating flattened system could be unstable due to gravitational disturbances. The data from C17O line emission show a dense core within this star-forming region. Additionally, the H2CO and the SO emissions appear clumpy and trace the disk-like structure, a possible interaction between a molecular core and the outflows, and in part, the cavity walls excavated by the thermal radio jet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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