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We report the first ground-based detection of the water line p-H2O (211-202)at 752.033 GHz in three z < 0.08 ultra-luminous infrared galaxies (ULIRGs):IRAS 06035-7102, IRAS 17207-0014 and IRAS 09022-3615. Using the AtacamaPathfinder EXperiment (APEX), with its Swedish-ESO PI Instrument for APEX(SEPIA) band-9 receiver, we detect this H2O line with overall signal-to-noiseratios of 8-10 in all three galaxies. Notably, this is the first detection ofthis line in IRAS 06035-7102. Our new APEX-measured fluxes, between 145 to 705Jy km s-1, are compared with previous values taken from Herschel SPIRE FTS. Wehighlight the great capabilities of APEX for resolving the H2O line profileswith high spectral resolutions while also improving by a factor of two thesignificance of the detection within moderate integration times. Whileexploring the correlation between the p-H2O(211-202) and the total infraredluminosity, our galaxies are found to follow the trend at the bright end of thelocal ULIRG's distribution. The p-H2O(211-202) line spectra are compared to themid-J CO and HCN spectra, and dust continuum previously observed with ALMA. Inthe complex interacting system IRAS 09022-3615, the profile of the wateremission line is offset in velocity with respect to the ALMA CO(J = 4 - 3)emission. For IRAS 17207-0014 and IRAS 06035-7102, the profiles between thewater line and the CO lines are spectroscopically aligned. This pilot studydemonstrates the feasibility of directly conducting ground-based high-frequencyobservations of this key water line, opening the possibility of detailedfollow-up campaigns to tackle its nature.

The first ground-based detection of the 752 GHz water line in local ultra-luminous infrared galaxies using APEX-SEPIA