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We detect luminous emission from HCN, HCO+ and HNC 1--0 in the QSO ULIRGMrk~231 with the IRAM Plateau de Bure Interferometer at 1."55 by 1."28resolution. All three lines show broad line wings - which are particularlyprominent for HCN. Velocities are found to be similar (750 km/s) to those foundfor CO 1-0. This is the first time bright HCN, HCO+ and HNC emission has beendetected in a large-scale galactic outflow. We find that both the blue- andred-shifted line wings are spatially extended by at least 0."75 (700 pc) in anorth-south direction. The line wings are brighter (relative to the line centerintensity) in HCN than in CO 1-0 and line ratios suggest that the molecularoutflow consists of dense (n>10E4 cmE-3) and clumpy gas with a high HCNabundance X(HCN)>10E-8. These properties are consistent with the molecular gasbeing compressed and fragmented by shocks in the outflow. Alternatively, HCN isinstead pumped by mid-IR continuum, but we propose that this effect is notstrong for the spatially extended outflowing gas. In addition, we find that therotation 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 detectedinside the central 400 pc of Mrk231. This HC3N emission may emerge from ashielded, dust-enshrouded region within the inner 40-50 pc where the gas isheated to high temperatures (200 - 300 K) by the AGN.

Detection of HCN, HCO+ and HNC in the Mrk231 molecular outflow - Dense molecular gas in the AGN wind