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We present Atacama Large Millimeter/Submillimeter Array (ALMA) continuumobservations of a sample of nine star-forming galaxies at redshifts 1.47 and2.23 selected from the High-$z$ Emission Line Survey (HiZELS). Four galaxies inour sample are detected at high significance by ALMA at a resolution of 0.25''at rest-frame 355 $\mu$m. Together with the previously observed H$\alpha$emission, from adaptive optics-assisted integral-field-unit spectroscopy(0.15'' resolution), and F606W and F140W imaging from the Hubble SpaceTelescope (0.2'' resolution), we study the star-formation activity, stellar anddust mass in these high-redshift galaxies at $\sim$kpc-scale resolution. Wefind that ALMA detection rates are higher for more massive galaxies($M_*>10^{10.5}$ M$_\odot$) and higher [N {\sc ii}]/H$\alpha$ ratios ($>0.25$,a proxy for gas-phase metallicity). The dust extends out to a radius of 8 kpc,with a smooth structure, even for those galaxies presenting clumpy H$\alpha$morphologies. The half-light radii ($R_{\rm dust}$) derived for the detectedgalaxies are of the order $\sim$4.5 kpc, more than twice the size ofsubmillimetre-selected galaxies at a similar redshift. Our globalstar-formation rate estimates -- from far-IR and extinction-corrected H$\alpha$luminosities -- are in good agreement. However, the different morphologies ofthe different phases of the interstellar medium suggest complex extinctionproperties of the high-redshift normal galaxies.

A kpc-scale resolved study of unobscured and obscured star-formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS