电离碳与星系活动
Ionised carbon and galaxy activity
摘要：
我们调查的可能性，158微米[CII]线的相对光度与远红外光度在河外源的减少源于一个更强的贡献，从加热的尘埃排放在更遥远的来源。由于这些调查的通量有限的性质，被检测到的物体的光度随着距离增加。然而，[CII]的光度并不像远红外那样急剧上升，从而导致L_[CII]/L_FIR比值随L_FIR而下降。进一步研究这一点，我们发现，[CII]的光度表现出类似的下降，对一氧化碳和无线电连续光谱光度测量。前者可能表明，在较高的光度下，更大部分的碳被锁定在分子的形式和/或CO线辐射也有助于冷却，主要是由[CII]线在低光度下完成。后者暗示了这些星系在更远距离处的活动增加，因此我们认为，除了恒星星族对尘埃的潜在加热外，还有来自活动核的紫外线辐射对嵌入尘埃环的加热，导致来自更明亮物体的远红外辐射过量。
英文摘要：
We investigate the possibility that the decrease in the relative luminosity of the 158 micron [CII] line with the far-infrared luminosity in extragalactic sources stems from a stronger contribution from the heated dust emission in the more distant sources. Due to the flux limited nature of these surveys, the luminosity of the detected objects increases with distance. However, the [CII] luminosity does not climb as steeply as that of the far-infrared, giving the decline in the L_[CII]/L_FIR ratio with L_FIR. Investigating this further, we find that the [CII] luminosity exhibits similar drops as measured against the carbon monoxide and radio continuum luminosities. The former may indicate that at higher luminosities a larger fraction of the carbon is locked up in the form of molecules and/or that the CO line radiation also contributes to the cooling, done mainly by the [CII] line at low luminosities. The latter hints at increased activity in these galaxies at greater distances, so we suggest that, in addition to an underlying heating of the dust by a stellar population, there is also heating of the embedded dusty torus by the ultra-violet emission from the active nucleus, resulting in an excess in the far-infrared emission from the more luminous objects.
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