具有极端Lfir/MH2比的Galerkin中的远红外线亏损
Far-Infrared Line Deficits in Galaxies with Extreme Lfir/MH2 Ratios
摘要：
我们报告的初步结果，从远红外线精细结构线观测的样本的44个本地星爆，塞弗特星系和红外发光星系获得的PACS光谱仪上的赫歇尔。我们表明，远红外光度和分子气体质量之间的比率，Lfir/MH 2，是一个更好的代理远红外线的相对亮度比Lfir单独。与Lfir/MH 2 < 80 Lsun/Msun的星系相比，具有高Lfir/MH 2比值的星系往往具有相对于其远红外连续谱较弱的精细结构线。赤字的[C II] 158微米线相对于Lfir以前发现的ISO卫星，但现在我们第一次表明，这是一个普遍的方面，所有远红外线精细结构线，无论其起源于电离或中性阶段的星际介质。Lfir/MH 2值这些线赤字开始体现是类似的限制，最近发现在星系中的气体恒星形成关系的研究的基础上，两种模式的恒星形成之间的分离。我们的发现，星际介质的属性也显着不同，在这些制度提供了独立的支持，不同的恒星形成的关系，在正常的盘状星系和主要的合并系统。我们使用光谱合成代码Cloudy来模拟谱线的发射。Lfir/MH_2的电离参数的预期增加可以同时解释[C_II]、[N_II]和[O_I]线的线缺陷。
英文摘要：
We report initial results from the far-infrared fine structure line observations of a sample of 44 local starbursts, Seyfert galaxies and infrared luminous galaxies obtained with the PACS spectrometer on board Herschel. We show that the ratio between the far-infrared luminosity and the molecular gas mass, Lfir/MH2, is a much better proxy for the relative brightness of the far-infrared lines than Lfir alone. Galaxies with high Lfir/MH2 ratios tend to have weaker fine structure lines relative to their far-infrared continuum than galaxies with Lfir/MH2 < 80 Lsun/Msun. A deficit of the [C II] 158 micron line relative to Lfir was previously found with the ISO satellite, but now we show for the first time that this is a general aspect of all far-infrared fine structure lines, regardless of their origin in the ionized or neutral phase of the interstellar medium. The Lfir/MH2 value where these line deficits start to manifest is similar to the limit that separates between the two modes of star formation recently found in galaxies on the basis of studies of their gas-star formation relations. Our finding that the properties of the interstellar medium are also significantly different in these regimes provides independent support for the different star forming relations in normal disk galaxies and major merger systems. We use the spectral synthesis code Cloudy to model the emission of the lines. The expected increase of the ionization parameter with Lfir/MH2 can simultaneously explain the line deficits in the [C II], [N II] and [O I] lines.
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