ULIRG的辐照ISM
The irradiated ISM of ULIRGs
摘要：
超大型IRGs的核内有大质量的年轻恒星，或一个吸积的中心黑洞，或两者兼而有之。结果是暴露于X射线（1-100千电子伏，XDR）和远紫外线辐射（6-13.6 eV，PDR）的分子气体。注意HCO+、HCN、HNC、OH、H2O和CO等物质。HCN/HCO+和HNC/HCN的线比率区分PDR和XDR。用HIFI/Herschel观察到的非常高的J（>10）CO线在XDR和PDR之间非常好地区分。在XDR中，很容易产生大量的热（T>100 K）H2O和OH。在PDR中，只有OH产生得类似。
英文摘要：
The nuclei of ULIRGs harbor massive young stars, an accreting central black hole, or both. Results are presented for molecular gas that is exposed to X-rays (1-100 keV, XDRs) and far-ultraviolet radiation (6-13.6 eV, PDRs). Attention is paid to species like HCO+, HCN, HNC, OH, H2O and CO. Line ratios of HCN/HCO+ and HNC/HCN discriminate between PDRs and XDRs. Very high J (>10) CO lines, observable with HIFI/Herschel, discriminate very well between XDRs and PDRs. In XDRs, it is easy to produce large abundances of warm (T>100 K) H2O and OH. In PDRs, only OH is produced similarly well.
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