Integrated intensities of the HCN 1–0 line emission. Left panel: the red-shifted wing emission from 350 to 990 km s-1. The grayscale range is from 0 to 0.7 Jy km s-1 (beam )-1 and the contours start at 0.098 Jy km s-1 (beam)-1 with steps of 0.0998 Jy km s-1 (beam)-1. Middle panel: the blue-shifted wing emission from −990 to −350 km s-1. Same grayscale and contours as for the previous panel. Right panel: the total (from − 990 km s-1 to 990 km s-1) integrated HCN 1–0 line emission from Mrk 231. The grayscale range is from 0 to 8 Jy km s-1 (beam)-1 and the contour levels are 0.45 Jy km s-1 (beam)-1 × (1,3,5,7,9,11,13,15,17,19). The thick white crosses mark the peak of the integrated HCN 1–0 line emission and the thinner crosses indicate the VLBI position (see footnote to Table 1) and 1′′ = 870 pc. Hatched ellipse indicates beam size and orientation.
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