Baseline-subtracted line profiles towards the center of NGC 5128 (Centaurus A) obtained with the ground-based telescopes SEST, JCMT, and APEX (top two rows) and with the HIFI instrument on-board of the Herschel Space Observatory (bottom two rows). Vertical scale is in Kelvin, horizontal scale is VLSR in km s-1. Species, transition and telescope used are identified at the top left corner of each panel. The HIFI 12CO results for the J = 8–7, J = 10–9, and J = 13–12 transitions are the averages of the profile towards the nucleus and the adjacent positions separated from that by 10′′. Note that the deep absorption apparent in the 13CO (1–0) profile is real; its depth to negative values reflects the weakness of the line emission relative to the (subtracted) continuum strength at the same frequency. For more details, see Sect. 2 and Tables 2 and 3.
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