LMC中光电加热和[ CII ]冷却的空间分辨研究
A spatially resolved study of photoelectric heating and [CII] cooling in the LMC
摘要：
我们研究整个大麦云云的光电加热。我们量化的重要性[CII]冷却线和光电加热过程中的各种环境中的LMC和调查哪些参数控制的程度光电加热。我们使用BICE [CII]地图和Spitzer/SAGE红外地图。我们研究了光电加热效率的空间变化：光电加热率超过谷物吸收的功率。我们关联了光电加热效率和各种尘埃成分的发射，并研究了作为Hα发射，尘埃温度和总红外光度的函数的变化。由此我们估计辐射场、气体温度和电子密度。我们发现光电效率的系统变化。最高的效率出现在漫射介质中，而最低的则出现在明亮的恒星形成区域（低约1.4倍）。[CII]线的发射占整个大麦哲伦星云远红外光度的1.32%。我们发现[CII]发射和中红外和远红外波段，其中包括各种尘埃成分的比率之间的相关性。的相关性进行了解释，在光的灰尘丰度的空间变化和当地的环境条件，影响粉尘排放性能。作为总红外表面亮度S_{TIR}的函数，[CII]表面亮度可描述为：S_{[CII]} =1.25 S_{TIR} ^{0.69} [10^{-3} erg s^{-1} cm^{-2} sr^{-1}]。[CII]发射与8微米发射具有良好的相关性，表明多环芳烃在光电加热过程中起主导作用。
英文摘要：
(abridged) We study photoelectric heating throughout the Large Magellanic Cloud. We quantify the importance of the [CII] cooling line and the photoelectric heating process of various environments in the LMC and investigate which parameters control the extent of photoelectric heating. We use the BICE [CII] map and the Spitzer/SAGE infrared maps. We examine the spatial variations in the efficiency of photoelectric heating: photoelectric heating rate over power absorbed by grains. We correlate the photoelectric heating efficiency and the emission from various dust constituents and study the variations as a function of Hαemission, dust temperatures, and the total infrared luminosity. From this we estimate radiation field, gas temperature, and electron density. We find systematic variations in photoelectric efficiency. The highest efficiencies are found in the diffuse medium, while the lowest coincide with bright star-forming regions (~1.4 times lower). The [CII] line emission constitutes 1.32% of the far infrared luminosity across the whole of the LMC. We find correlations between the [CII] emission and ratios of the mid infrared and far infrared bands, which comprise various dust constituents. The correlations are interpreted in light of the spatial variations of the dust abundance and by the local environmental conditions that affect the dust emission properties. As a function of the total infrared surface brightness, S_{TIR}, the [CII] surface brightness can be described as: S_{[CII]}=1.25 S_{TIR}^{0.69} [10^{-3} erg s^{-1} cm^{-2} sr^{-1}]. The [CII] emission is well-correlation with the 8 micrometer emission, suggesting that the polycyclic aromatic hydrocarbons play a dominant role in the photoelectric heating process.
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