ULIRG中强蓝移中红外[ NeIII ]和[ NeV ]发射的发现
Discovery of strongly blue shifted mid-infrared [NeIII] and [NeV] emission in ULIRGs
摘要：
我们报告了在82个ULIRG中的25个（占我们样本的30%）中发现了蓝移（delta（V）> 200 km/s）的中红外[NeIII]和/或[NeV]发射。蓝移[NeV]辐射的发生率甚至更高（59%），其中[NeV]辐射是活动星系核（AGN）的标志。在我们的样品中，有16个ULIRGs，其中11个光学分类为活动星系核，[NeIII]蓝移超过200 km/s。通过比较它们的12.81 μ m [NeII]、15.56 μ m [NeIII]和14.32 μ m [NeV]谱线，发现蓝移气体的电离度随蓝移的增加而增加，这意味着在一个被活动星系核光电离的分层介质中，存在着减速外流。[NeIII]线的线宽与射电光度的强相关性表明，扩张的射电喷流与活动星系核周围密集的ISM的相互作用可以解释在这个样本中观察到的最强射电源的氖线运动学。
英文摘要：
We report the discovery of blue shifted (delta(V) > 200 km/s) mid-infrared [NeIII] and/or [NeV] emission in 25 out of 82 ULIRGs (30% of our sample). The incidence of blue shifted [NeV] emission is even higher (59%) among the sources with a [NeV] detection -- the tell-tale signature of an active galactic nucleus (AGN). Sixteen ULIRGs in our sample, eleven of which are optically classified as AGN, have [NeIII] blue shifts above 200 km/s. A comparison of the line profiles of their 12.81um [NeII], 15.56um [NeIII] and 14.32um [NeV] lines reveals the ionization of the blue shifted gas to increase with blue shift, implying decelerating outflows in a stratified medium, photo-ionized by the AGN. The strong correlation of the line width of the [NeIII] line with the radio luminosity indicates that interaction of expanding radio jets with the dense ISM surrounding the AGN may explain the observed neon line kinematics for the strongest radio sources in this sample.
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