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We present Atacama Large Millimeter/Submillimeter Array (ALMA) CO (1-0) andCO (3-2) observations of SDSS J135646.10+102609.0, an obscured quasar andultra-luminous infrared galaxy (ULIRG) with two merging nuclei and a known20-kpc-scale ionized outflow. The total molecular gas mass is M_{mol} ~9^{+19}_{-6} x 10^8 Msun, mostly distributed in a compact rotating disk at theprimary nucleus (M_{mol} ~ 3 x 10^8 Msun) and an extended tidal arm (M_{mol} ~5 x 10^8 Msun). The tidal arm is one of the most massive molecular tidalfeatures known; we suggest that it is due to the lower chance of shockdissociation in this elliptical/disk galaxy merger. In the spatially resolvedCO (3-2) data, we find a compact (r ~ 0.3 kpc) high velocity (v ~ 500 km/s)red-shifted feature in addition to the rotation at the N nucleus. We propose amolecular outflow as the most likely explanation for the high velocity gas. Theoutflowing mass of M_{mol} ~ 7 x 10^7 Msun and the short dynamical time oft_{dyn} ~ 0.6 Myr yield a very high outflow rate of \dot{M}_{mol} ~ 350 Msun/yrand can deplete the gas in a million years. We find a low star formation rate(< 16 Msun/yr from the molecular content and < 21 Msun/yr from the far-infraredspectral energy distribution decomposition) that is inadequate to supply thekinetic luminosity of the outflow (\dot{E} ~ 3 x 10^43 erg/s). Therefore, theactive galactic nucleus, with a bolometric luminosity of 10^46 erg/s, likelypowers the outflow. The momentum boost rate of the outflow (\dot{p}/(Lbol/c) ~3) is lower than typical molecular outflows associated with AGN, which may berelated to its compactness. The molecular and ionized outflows are likely twodistinct bursts induced by episodic AGN activity that varies on a time scale of10^7 yr.

ALMA Observations of a Candidate Molecular Outflow in an Obscured Quasar