论文标题
与大量星形区域相关的密集岩心的尘埃温度曲线
Dust Temperature Profiles in Dense Cores Associated With Massive Star-Forming Regions
论文作者
论文摘要
使用Apex-12m望远镜，获得了来自南半球的八个气盘云的连续图。云与巨大的恒星和恒星簇形成的区域相关，并具有致密的岩心。估计最高水平的核心尺寸为$ \ sim 0.1-0.2 $ 〜PC，核心质量和平均气体密度位于范围内：$ \ sim 20-1000〜m _ {\ odot} $和$ \ sim（0.3-7.3）\ sim（0.3-7.3）\ times 10^6 $ 〜cm 〜cm 〜cm $^cm $^{-3} $。已经执行了350〜 $μ$ M数据与观测值1.2〜mm的比较。从两个波长的强度之比到相同的角度分辨率，计算了视线上平均灰尘温度的空间分布。大多数物体的尘埃温度图与强度的空间分布相关。在核心中检测到距离中心距离的灰尘温度降低。在大多数情况下，尘埃温度曲线接近线性。使用简单的球形对称云模型，表明可以通过改变密度曲线参数并设置$β$的温度曲线与观察到的温度曲线相似，并设置$β$，这是灰尘发射率依赖频率，常数的幂律索引。结果表明，灰尘温度估计很大程度上取决于$β$的公认值。云中$β$的可能变化如何影响获得的结果。
Using the APEX-12m telescope, continuum maps at 350~$μ$m of eight gas-dust clouds from the southern hemisphere are obtained. Clouds are associated with the regions of massive star and star cluster formation and have dense cores. Core sizes estimated at the half maximum level are $\sim 0.1-0.2$~pc, core masses and mean gas densities lie in the ranges: $\sim 20-1000~M_{\odot}$ and $\sim (0.3-7.3)\times 10^6$~cm$^{-3}$, respectively. Comparison of the 350~$μ$m data with the data of observations at 1.2~mm has been performed. From the ratios of intensities at two wavelengths convolved to the same angular resolution, spatial distributions of dust temperatures averaged over the line of sight are calculated. Dust temperature maps for most objects correlate with spatial distributions of intensities at 350~$μ$m. A decrease in dust temperature with a distance from the center is detected in the cores. Dust temperature profiles in most cases are close to linear ones. Using a simple spherically-symmetric cloud model it is shown that temperature profiles similar to the observed ones can be obtained in a model with internal source by varying density profile parameters and setting $β$, a power-law index of the dust emissivity dependence on frequency, constant. It is shown that the dust temperatures estimates strongly depend on the accepted value of $β$. It is considered how possible variations of $β$ in a cloud can affect the results obtained.
