Herschel view of the Taurus B211/3 filament and striations: evidence of filamentary growth?
Herschel view of the Taurus B211/3 filament and striations: evidence of filamentary growth?
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金牛座 B211/3 细丝和条纹的赫歇尔视图：丝状生长的证据？
DOI：
10.1051/0004-6361/201220500
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发表时间：
2013
影响因子：
6.5
通讯作者：
Palmeirim P
中科院分区：
文献类型：
--
作者：
Palmeirim P
我们目前的第一个结果从theherschelGould带调查的B211/L1495地区的金牛座分子云。由于其高灵敏度和动态范围，赫歇尔图像揭示了致密的，恒星形成的灯丝B211的结构与前所未有的细节，沿着与条纹的存在垂直于灯丝和一般取向沿着磁场方向跟踪光学偏振矢量。根据Herschel数据得到的尘埃柱密度和尘埃温度分布图，我们发现B211暗条的径向密度分布在大半径处接近幂律行为，ρ π r−2.0± 0.4，而温度分布在小半径处表现出明显的下降。观察到的B211细丝的密度和温度分布与圆柱形细丝进行重力收缩的理论模型非常一致，其状态方程为：P ‡ ργ和T ‡ ργ-1，其中γ= 0.97 ± 0.01 < 1（即，不是严格等温的）。柱密度图的形态，其中一些垂直条纹显然连接到B211灯丝，进一步表明材料可能是沿着沿着条纹到主灯丝上。在这张图片中，预计下落物质的典型速度为~0.5-1 km s-1，这与先前CO观测的现有运动学约束一致。
We present first results from theHerschelGould Belt survey for the B211/L1495 region in the Taurus molecular cloud. Thanks to their high sensitivity and dynamic range, theHerschelimages reveal the structure of the dense, star-forming filament B211 with unprecedented detail, along with the presence of striations perpendicular to the filament and generally oriented along the magnetic field direction as traced by optical polarization vectors. Based on the column density and dust temperature maps derived from theHerscheldata, we find that the radial density profile of the B211 filament approaches power-law behavior,ρ∝r−2.0± 0.4, at large radii and that the temperature profile exhibits a marked drop at small radii. The observed density and temperature profiles of the B211 filament are in good agreement with a theoretical model of a cylindrical filament undergoing gravitational contraction with a polytropic equation of state:P∝ργandT∝ργ−1, withγ= 0.97 ± 0.01 < 1 (i.e., not strictly isothermal). The morphology of the column density map, where some of the perpendicular striations are apparently connected to the B211 filament, further suggests that the material may be accreting along the striations onto the main filament. The typical velocities expected for the infalling material in this picture are ~0.5–1 km s-1, which are consistent with the existing kinematical constraints from previous CO observations.
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赫歇尔空间天文台的光电探测器阵列相机和光谱仪 (PACS)
影响因子：
4.8
作者：
A. Poglitsch;C. Waelkens;O. Bauer;J. Cepa;H. Feuchtgruber;T. Henning;C. van Hoof;F. Kerschbaum;D. Lemke;E. Renotte;L. Rodriguez;P. Saraceno;B. Vandenbussche
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DOI：
10.1086/341347
发表时间：
2002-08
期刊：
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影响因子：
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DOI：
10.1086/306249
发表时间：
1998-10
期刊：
The Astrophysical Journal
影响因子：
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作者：
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通讯作者：
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影响因子：
6.5
作者：
E. Falgarone;J. Pety;P. Hily
通讯作者：
P. Hily