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We compare the extent of the dust, molecular gas and stars in threestar-forming galaxies, at $z= 1.4, 1.6$ and $2.7$, selected from the HubbleUltra Deep Field based on their bright CO and dust-continuum emission as wellas their large rest-frame optical sizes. The galaxies have high stellar masses,$\mathrm{M}_*>10^{11}\mathrm{M}_\odot$, and reside on, or slightly below, themain sequence of star-forming galaxies at their respective redshifts. We probethe dust and molecular gas using subarcsecond Atacama LargeMillimeter/submillimeter Array observations of the 1.3 mm continuum and CO lineemission, respectively, and probe the stellar distribution using \emph{HubbleSpace Telescope} observations at 1.6 \textmu m. We find that for all threegalaxies the CO emission appears $\gtrsim 30\%$ more compact than the stellaremission. For the $z= 1.4$ and $2.7$ galaxies, the dust emission is also morecompact, by $\gtrsim 50\%$, than the stellar emission, whereas for the $z=1.6$galaxy, the dust and stellar emission have similar spatial extents. Thissimilar spatial extent is consistent with observations of local disk galaxies.However, most high redshift observations show more compact dust emission,likely due to the ubiquity of central starbursts at high redshift and thelimited sensitivity of many of these observations. Using the CO emission line,we also investigate the kinematics of the cold interstellar medium in thegalaxies, and find that all three have kinematics consistent with arotation-dominated disk.

A Comparison of the Stellar, CO and Dust-Continuum Emission from Three, Star-Forming HUDF Galaxies at $z\sim 2$