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First clear detection of the CCS Zeeman splitting toward the pre-stellar core, Taurus Molecular Cloud 1

机译:首先清楚地检测CCS塞曼倾向于恒星核心,金牛座分子云1

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摘要

We report the first clear detection of the Zeeman splitting of a CCS emission line at 45 GHz toward the nearby pre-stellar dense filament, Taurus Molecular Cloud 1 (TMC-1). We observed HC3N non-Zeeman lines simultaneously with the CCS line, and did not detect any significant splitting of the HC3N lines. Thus, we conclude that our detection of CCS Zeeman splitting is robust. The derived line-of-sight magnetic field strength is about 117 +/- 21 mu G, which corresponds to a normalized mass-to-magnetic flux ratio of 2.2 if we adopt an inclination angle of 45 degrees. Thus, we conclude that the TMC-1 filament is magnetically supercritical. Recent radiative transfer calculations of the CCS and HC3N lines along the line of sight suggest that the filament is collapsing with a speed of similar to 0.6 km s(-1), which is comparable to three times the isothermal sound speed. This infall velocity appears to be consistent with the evolution of a gravitationally infalling core.
机译:我们报告了在45 GHz朝向附近的恒星致密丝,金牛座分子云1(TMC-1)中的第一个清楚地检测CCS排放线的塞曼分裂。 我们与CCS线同时观察HC3N非塞曼线,并没有检测到HC3N线的任何显着分裂。 因此,我们得出结论,我们对CCS塞曼分裂的检测是强大的。 衍生的视线磁场强度约为117 +/-21μg,如果我们采用45度的倾斜角度,则对应于归一化的质量磁通量为2.2。 因此,我们得出结论,TMC-1灯丝是磁性超临界的。 沿着视线的CCS和HC3N线的最近辐射转移计算表明,灯丝的速度与类似于0.6 km s(-1)的速度折叠,这与等温速度的三倍相当。 这种缺少速度似乎与引力缺陷芯的演变一致。

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