论文标题

$ HERSCHEL $对岩心和丝状结构的调查

$Herschel$ investigation of cores and filamentary structures in the Perseus molecular cloud

论文作者

Zhang, Chang, Zhang, Guo-Yin, Li, Jin-Zeng, Li, Xue-Mei

论文摘要

核心和丝状结构是恒星的主要出生地,并且在恒星形成过程中起关键作用。多尺度源和丝提取方法的最新进展,以及从$ Herschel $多波长观察的高分辨率柱密度图使我们能够在高度复杂的分子云环境中检测到丝状网络结构。物理参数的统计数据表明,核心质量与核心灰尘温度密切相关,$ m/l $与$ m/t $密切相关,这与黑体辐射的预测一致,可用于追踪从未结合的无星核到强大的Prestellar核心的进化序列。丝状结构的波峰柱密度与单位长度的质量($ m _ {\ rm line} $)明显相关,但与从$ \ sim 10^{20} $到$ \ sim 10^{22}^{22} $ \ rm cm cm cm cm cm^{ - 2} $不相关。最大最大宽度(FWHM)的中位数为0.15 PC,这与先前研究报告的丝状结构的典型内部宽度一致。我们发现$ \ sim $ 70 \%的稳健的预核(135/199)嵌入了$ m _ {\ rm line}> 16〜m _ {\ odot}/{\ odot}/{\ rm pc} $中,这意味着重力绑定了cores果来自超级挑战的范围,这意味着,这意味着重力绑定了超级挑战的范围。并且,基于观察证据表明,在南部的珀尔修斯(Perseus South)中具有幂律分布的概率分布函数(PDF)比北部的较平坦,YSO的数量明显小于北部的数字,并且尘埃差异。我们推断,南部地区比北部地区更具重力约束。

Cores and filamentary structures are the prime birthplaces of stars, and play key roles in the process of star formation. Latest advances in the methods of multi-scale source and filament extraction, and in making high-resolution column density map from $Herschel$ multi-wavelength observations enable us to detect the filamentary network structures in highly complex molecular cloud environments. The statistics for physical parameters shows that core mass strongly correlates with core dust temperature, and $M/L$ strongly correlates with $M/T$, which is in line with the prediction of the blackbody radiation, and can be used to trace evolutionary sequence from unbound starless cores to robust prestellar cores. Crest column densities of the filamentary structures are clearly related with mass per unit length ($M_{\rm line}$), but are uncorrelated by three orders ranging from $\sim 10^{20}$ to $\sim 10^{22}$ $ \rm cm^{-2}$ with widths. Full width at half maximum (FWHM) have a median value of 0.15 pc, which is consistent with the 0.1 pc typical inner width of the filamentary structures reported by previous research. We find $\sim $70\% of robust prestellar cores (135/199) embedded in supercritical filaments with $M_{\rm line}>16~M_{\odot}/{\rm pc}$, which implies that the gravitationally bound cores come from fragmentation of supercritical filaments. And on the basis of observational evidences that probability distribution function (PDF) with power-law distribution in the Perseus south is flatter than north, YSO number is significantly less than that in the north, and dust temperature difference. We infer that south region is more gravitationally bound than north region.

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