检测Mrk231分子流出物中的HCN、HCO+和HNC-AGN风中的致密分子气体
Detection of HCN, HCO+ and HNC in the Mrk231 molecular outflow - Dense molecular gas in the AGN wind
摘要：
我们利用IRAM高原干涉仪在1。"55比1。"28决议。所有三条线都显示宽线翼-这对于HCN特别突出。速度被发现是相似的（750公里/秒），发现CO 1 - 0。这是第一次在大规模星系外流中检测到明亮的HCN，HCO+和HNC发射。我们发现，蓝移和红移线翼的空间扩展至少0。"75（700 pc）在南北方向。HCN中的线翼比CO 1 - 0中的更亮（相对于线中心强度），并且线比率表明分子流出物由具有高HCN丰度X（HCN）> 10E-8的致密气体（n> 10E4 cm E-3）和凝块气体组成。这些性质与流出物中的冲击压缩和破碎的分子气体一致。或者，HCN，而不是泵浦中红外连续，但我们建议，这种效果是不强的空间扩展的流出气体。此外，我们还发现，在HCN、HCO+和HNC谱线发射中，主盘的东西向旋转也很明显。在Mrk231的中心400 pc内检测到意外明亮的HC3N 10 - 9线。这种HC3N辐射可能来自内部40 - 50 pc内被屏蔽的尘埃覆盖的区域，在那里气体被AGN加热到高温（200 - 300 K）。
英文摘要：
We detect luminous emission from HCN, HCO+ and HNC 1--0 in the QSO ULIRG Mrk~231 with the IRAM Plateau de Bure Interferometer at 1."55 by 1."28 resolution. All three lines show broad line wings - which are particularly prominent for HCN. Velocities are found to be similar (750 km/s) to those found for CO 1-0. This is the first time bright HCN, HCO+ and HNC emission has been detected in a large-scale galactic outflow. We find that both the blue- and red-shifted line wings are spatially extended by at least 0."75 (700 pc) in a north-south direction. The line wings are brighter (relative to the line center intensity) in HCN than in CO 1-0 and line ratios suggest that the molecular outflow consists of dense (n>10E4 cmE-3) and clumpy gas with a high HCN abundance X(HCN)>10E-8. These properties are consistent with the molecular gas being compressed and fragmented by shocks in the outflow. Alternatively, HCN is instead pumped by mid-IR continuum, but we propose that this effect is not strong for the spatially extended outflowing gas. In addition, we find that the rotation of the main disk, in east-west direction, is also evident in the HCN, HCO+ and HNC line emission. An unexpectedly bright HC3N 10-9 line is detected inside the central 400 pc of Mrk231. This HC3N emission may emerge from a shielded, dust-enshrouded region within the inner 40-50 pc where the gas is heated to high temperatures (200 - 300 K) by the AGN.
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