Interstellar Turbulence: High-Resolution C18O Mapping Observations of Heiles' Cloud 2 – Statistical Properties of the Line Width –
Interstellar Turbulence: High-Resolution C18O Mapping Observations of Heiles' Cloud 2 – Statistical Properties of the Line Width –
复制标题
星际湍流：海尔斯云 2 的高分辨率 C18O 测绘观测 – 线宽的统计特性 –
DOI：
10.1017/cbo9780511564666.032
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Y. Kitamura
中科院分区：
文献类型：
--
作者：
K. Sunada;Y. Kitamura
利用光学薄的C18O J=L-0发射，我们绘制了金牛座分子云复合体中海尔斯云2(Hcl2)的1×1.5的整个区域。半高宽光束尺寸为17“，地图覆盖了从0.03pC到3pC的空间尺度。结果表明，HCL2由6根细丝组成，平均尺寸为1.17pC×0.35pC。所有的细丝都垂直于局部磁场。这一事实表明，磁场可能决定了细丝的取向。非热运动在细丝中占主导地位。在六根单丝中，我们发现了加入和不加入YSOs的单丝之间的C18O谱线宽度的差异。含有YSOs的单丝的C18O谱比无星单丝的C18O谱线宽。这些宽线与YSO本身无关，而是集中在强谱线强度区域。这些地区的线条似乎有几个峰值。这些事实表明，一条视线上存在几个小碎片，碎片的拥挤程度将决定线宽。碎片的浓度可能会触发细丝内恒星的形成。
We have mapped the entire region of «1 x 1.5 of Heiles' Cloud 2 (HCL2) in Taurus Molecular Cloud Complex using the optically thin C18O J= l-0 emission. The FWHM beam size was 17" and the map covers the spatial scales from 0.03 pc to 3 pc. It is found that HCL2 consists of six filaments with a mean size of 1.17 pc x 0.35 pc. All the filaments are perpendicular to the local magnetic field. This fact suggests the magnetic field probably determines the orientation of the filaments. Non-thermal motions are dominant in the filaments. Within the six filaments, we found the difference of the C18O line widths between the filaments associated with and without YSOs. The C18O spectra in the filaments with YSOs show broader line widths than those in the starless filaments. These broad lines are not associated with YSOs themselves, but are concentrated in strong line intensity regions. The lines in these regions seem to have several peaks. These facts suggest the presence of several small fragments along a line of sight, and the crowdedness of the fragments would determine the line widths. The concentrations of the fragments might trigger the star formation within the filaments.