ALMA Detection of the Vibrationally Excited HCN J=4-3 Emission Line in
  the AGN-Hosting Luminous Infrared Galaxy IRAS 20551-4250
  We present results from our ALMA Cycle 0 observations, at the frequencies
around the HCN, HCO+, and HNC J=4-3 transition lines, of the luminous infrared
galaxy IRAS 20551-4250 at z=0.043, which is known to host an energetically
important obscured AGN. In addition to the targeted HCN, HCO+, and HNC J=4-3
emission lines, two additional strong emission lines are seen, which we
attribute to H2S and CH3CN(+CCH). The HCN-to-HCO+ J=4-3 flux ratio (~0.7) is
higher than in the other starburst-dominated galaxy (~0.2) observed in our ALMA
Cycle 0 program. We tentatively (~5 sigma) detected the vibrationally excited
(v2=1) HCN J=4-3 (l=1f) emission line, which is important for testing an
infrared radiative pumping scenario for HCN. This is the second detection of
this molecular transition in external galaxies. The most likely reason for this
detection is not only the high flux of this emission line, but also the small
molecular line widths observed in this galaxy, suggesting that vibrational
excitation of HCN may be relatively common in AGN-hosting galaxies.
