%0 Generic %1 molina2019kiloparsecscale %A Molina, J. %A Ibar, Edo %A Smail, I. %A Swinbank, A. M. %A Villard, E. %A Escala, A. %A Sobral, D. %A Hughes, T. M. %D 2019 %K ALMA high-z %R 10.1093/mnras/stz1643 %T The kiloparsec-scale gas kinematics in two star-forming galaxies at $z 1.47$ seen with ALMA and VLT-SINFONI %U http://arxiv.org/abs/1906.06245 %X We present Atacama Large Millimeter/submillimeter Array (ALMA) CO($J=2-1$) observations of two main-sequence star-forming galaxies at $z\sim1.47$ taken from the High-Z Emission Line Survey (HiZELS). These two systems have been previously reported to be molecular gas rich $f_H_2 M_\rm H_2/(M_H_2 + M_\star) 0.8$. We carried out a follow-up study to resolve, at $\sim$kpc-scales, the CO emission. These new observations are combined with our earlier ALMA observations (sensitive to diffuse CO emission) and compared with our previous H$\alpha$-based study at matched spatial resolution. One target is marginally resolved in CO(2-1), showing complex dynamics with respect to the ionised gas traced by H$\alpha$. While the other source is spatially resolved, enabling a detailed exploration of its internal dynamical properties. In this system, both gaseous phases show similar spatial extension, rotation velocities and velocity dispersions ($V_rot \sim \sigma_v 100$\,km\,s$^-1$) suggesting a rotational velocity to velocity dispersion ratio consistent with unity. By comparing the ionized and molecular gas tracers through the use of a two-dimensional kinematic model, we estimate a median depletion time $\tau_dep=2.3 1.2$\,Gyr for the galaxy as a whole. This value is in agreement with the average $\tau_dep$ value observed in local star-forming galaxies at similar spatial scales. Using a thick-disk dynamical modelling, we derive a dynamical mass $M_dyn = (1.59\pm0.19) 10^11$\,$M_ødot$ within $6$\,kpc. This suggests a dark matter fraction ($f_DM M_DM/M_dyn$) of $0.59\pm0.10$, in agreement with the average $f_DM$ value derived from stacked rotation curve analysis of galaxies at similar redshift range.

@misc{molina2019kiloparsecscale, abstract = {We present Atacama Large Millimeter/submillimeter Array (ALMA) CO($J=2-1$) observations of two main-sequence star-forming galaxies at $z\sim1.47$ taken from the High-Z Emission Line Survey (HiZELS). These two systems have been previously reported to be molecular gas rich $f_{\rm H_2} \equiv M_{\rm H_2}/(M_{\rm H_2} + M_\star) \sim 0.8$. We carried out a follow-up study to resolve, at $\sim$kpc-scales, the CO emission. These new observations are combined with our earlier ALMA observations (sensitive to diffuse CO emission) and compared with our previous H$\alpha$-based study at matched spatial resolution. One target is marginally resolved in CO(2-1), showing complex dynamics with respect to the ionised gas traced by H$\alpha$. While the other source is spatially resolved, enabling a detailed exploration of its internal dynamical properties. In this system, both gaseous phases show similar spatial extension, rotation velocities and velocity dispersions ($V_{\rm rot} \sim \sigma_v \sim 100$\,km\,s$^{-1}$) suggesting a rotational velocity to velocity dispersion ratio consistent with unity. By comparing the ionized and molecular gas tracers through the use of a two-dimensional kinematic model, we estimate a median depletion time $\tau_{\rm dep}=2.3 \pm 1.2$\,Gyr for the galaxy as a whole. This value is in agreement with the average $\tau_{\rm dep}$ value observed in local star-forming galaxies at similar spatial scales. Using a thick-disk dynamical modelling, we derive a dynamical mass $M_{\rm dyn} = (1.59\pm0.19) \times 10^{11}$\,$M_\odot$ within $\approx 6$\,kpc. This suggests a dark matter fraction ($f_{\rm DM} \equiv M_{\rm DM}/M_{\rm dyn}$) of $0.59\pm0.10$, in agreement with the average $f_{\rm DM}$ value derived from stacked rotation curve analysis of galaxies at similar redshift range.}, added-at = {2019-06-17T15:28:47.000+0200}, author = {Molina, J. and Ibar, Edo and Smail, I. and Swinbank, A. M. and Villard, E. and Escala, A. and Sobral, D. and Hughes, T. M.}, biburl = {https://www.bibsonomy.org/bibtex/2700ff7d32add2705a63dfb8f6f40aaa2/heh15}, description = {The kiloparsec-scale gas kinematics in two star-forming galaxies at $z \sim 1.47$ seen with ALMA and VLT-SINFONI}, doi = {10.1093/mnras/stz1643}, interhash = {e98e3d58098e36f58775e2ea85f58883}, intrahash = {700ff7d32add2705a63dfb8f6f40aaa2}, keywords = {ALMA high-z}, note = {cite arxiv:1906.06245Comment: 15 Pages, 9 Figures and 4 Tables. Accepted for publication in MNRAS}, timestamp = {2019-06-17T15:28:47.000+0200}, title = {The kiloparsec-scale gas kinematics in two star-forming galaxies at $z \sim 1.47$ seen with ALMA and VLT-SINFONI}, url = {http://arxiv.org/abs/1906.06245}, year = 2019 }