Testing the blast-wave AGN feedback scenario in MCG-03-58-007.

Abstract

We report the first Atacama large millimeter/submillimeter array observations of MCG-03-58-007, a local ($z=0.03236\\pm0.00002$, this work) AGN ($L_{AGN}\\sim10^{45}~\\rm erg~s^{-1}$), hosting a powerful X-ray ultra-fast ($v=0.1c$) outflow (UFO). The CO(1-0) line emission is observed across $\\sim18\\,$kpc scales with a resolution of $\\sim 1\\,\\rm kpc$. About 78\\% of the CO(1-0) luminosity traces a galaxy-size rotating disk. However, after subtracting the emission due to such rotating disk, we detect with a S/N=20 a residual emission in the central $\\sim 4\\,$kpc. Such residuals may trace a low velocity ($v_{max}=170\\,\\rm km\\,s^{-1}$) outflow. We compare the momentum rate and kinetic power of such putative molecular outflow with that of the X-ray UFO and find that its energetics would be consistent with a momentum-driven blast-wave feedback model with $\\dot{P}_{out}/\\dot{P}_{UFO}=0.3\\pm0.2$. This result is at odds with the energy-conserving scenario suggested by the momentum-boosted massive molecular outflows detected in some local ULIRGs. An alternative interpretation of the residual CO emission would be a compact rotating structure, distinct from the main disk, which would be a factor of $\\sim10-100$ more extended and massive than typical circumnuclear disks revealed in Seyferts. However, in both scenarios, our results rule out the hypothesis of a momentum-boosted molecular outflow in this AGN, despite the presence of a powerful X-ray UFO. [Abridged]