Resolving discs and mergers in <i>z</i> ? 2 heavily reddened quasars and their companion galaxies with ALMA

We present sub-arcsecond resolution ALMA imaging of the CO(3-2) emission in two $z\sim2.5$ heavily reddened quasars (HRQs) - ULASJ1234+0907 and ULASJ2315+0143 their companion galaxies. Dynamical modeling resolved velocity fields enables us to constrain molecular gas morphologies host galaxy masses. Combining new data with extensive multi-wavelength observations, we are able study relative kinematics different lines, fractions locations on M$_{\rm{BH}}$-M$_{\rm{gal}}$ relation. Despite having similar black-hole properties, HRQs display markedly properties local environments. J1234 has a very massive host, M$_{\rm{dyn}} \sim 5 \times 10^{11}$M$_\odot$ galaxies that similarly located within 200 kpc quasar. The fraction is low ($\sim$6%). significant ongoing star formation entirely obscured at rest-frame UV optical wavelengths. J2315 into close-separation major-merger ($\Delta$r=15 kpc; $\Delta$v=170 km/s) $\sim$1:2 mass ratio. total dynamical estimated be $\lesssim$10$^{11}$M$_\odot$ high ($>$45%). A HSC image shows unobscured UV-luminous star-forming regions co-incident extended reservoir cold merger. use outputs from Illustris simulations track growth such black holes $z\sim6$ day. While consistent simulated $z\sim2$ relation, hole over-massive its galaxy.