The impact of star formation and active nuclei on the interstellar medium in ultraluminous infrared galaxies
The impact of star formation and active nuclei on the interstellar medium in ultraluminous infrared galaxies
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超光红外星系中恒星形成和活动核对星际介质的影响
DOI：
10.1023/a:1002694926293
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发表时间：
1999
影响因子：
1.9
通讯作者：
P. Maloney
中科院分区：
文献类型：
--
作者：
P. Maloney
在超红外星系（ulrgs）中，输入到星际介质的能量是巨大的，无论电源的性质如何。我讨论了这些星系中ISM的结构和能量学的一些主要结果。在观测上，我们知道ulrgsa核心区域的柱密度非常高，这使得从magn中区分星暴非常困难。能量和动量注入的水平意味着ISM中的压力必须非常高，至少比本地ISM或典型的巨分子云中的压力大3-4个数量级。这也意味着ulrgcs的光度必须非常高，因为它们在其生命周期内必须辐射许多倍于它们的结合能。我简要回顾了x射线照射对agn供电的ulrgs的ISM的影响。最后，我表明，在ulrgs中多环芳烃特征的存在并不意味着它们一定是星暴主导的，因为在ulrgs中ISM典型的柱密度和压力下，多环芳烃甚至可以在距离AGN几十秒差距的地方存在。
The energy input into the interstellar medium in UltraluminousInfrared Galaxies (ULIRGs) is enormous, regardless of the nature ofthe power source. I discuss some of the major consequences for thestructure and energetics of the ISM in these galaxies. Observationally, the column densities in the nuclear regions of ULIRGsare known to be very high, which makes distinguishing starbursts fromAGN quite difficult. The level of energy and momentum injection meansthat the pressure in the ISM must be extremely high, at least 3-4orders of magnitude larger than in the local ISM or typical giantmolecular clouds. It also means that the luminosity of GMCs in ULIRGsmust be very high, as they must radiate many times their bindingenergy over their lifetimes. I briefly review the influence whichX-ray irradiation can have on the ISM in AGN-powered ULIRGs. Finally,I show that the presence of PAH features in ULIRGs does not imply thatthey must be starburst-dominated, since at the column densities andpressures typical of the ISM in ULIRGs PAHs can survive even at tensof parsec distances from the AGN.