paper

2D Kinematics and physical properties of 1.0 < z < 1.5 star-forming galaxies

arXiv:0912.4579 · doi:10.1111/j.1365-2966.2009.16082.x

Abstract

We combined two-dimensional kinematic and morphology information on the Halpha emission, obtained using near-infrared integral field spectroscopy, with broad-band photometry to investigate the dynamical structure and the physical properties of a sample of ten late-type galaxies at 1.0 < z < 1.5. The sample displays a range of kinematical types which include one merger, one face-on galaxy, and eight objects showing evidence of rotation. Among these eight objects, half are rotation-dominated galaxies, while the rest are dispersion-dominated. We found also that two galaxies out of the rotation-dominated galaxies are pure rotationally supported disks. They achieve a maximum velocity of ~180-290 km/s within ~0.5-1 kpc, similar to local spirals with thin disks. The galaxies of our sample have relatively young stellar populations (< 1.5 Gyr) and possess a range of stellar mass of 0.6-5 X10^10 Msun. In addition, most of them have not yet converted the majority of their gas into stars (six galaxies have their gas fraction >50 per cent). Therefore, those of them which already have a stable disk will probably have their final stellar mass similar to the present-day spirals, to which these rotating systems can be seen as precursors. We conclude our study by investigating the stellar mass Tully-Fisher relation at 1.2 < z < 1.5.

18 pages. Accepted 2009 November 20 for publication in MNRAS

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