ZFIRE: The Kinematics of Star-Forming Galaxies as a Function of Environment at z~2

Leo Y. Alcorn, Kim-Vy H. Tran, Glenn G. Kacprzak, Themiya Nanayakkara, Caroline Straatman, Tiantian Yuan, Rebecca J. Allen, Michael Cowley, Romeel Davé, Karl Glazebrook, Lisa J. Kewley, Ivo Labbé, Ryan Quadri, Lee R. Spitler, Adam Tomczak

Published 2016-06-02Version 1

We perform a kinematic analysis of galaxies at $z\sim2$ in the COSMOS legacy field using near-infrared (NIR) spectroscopy from Keck/MOSFIRE as part of the ZFIRE survey. Our sample consists of 75 Ks-band selected star-forming galaxies from the ZFOURGE survey with stellar masses ranging from log(M$_{\star}$/M$_{\odot}$)$=9.0-11.0$, 28 of which are members of a known overdensity at $z=2.095$. We measure H$\alpha$ emission-line integrated velocity dispersions ($\sigma_{\rm int}$) from 50$-$230 km s$^{-1}$, consistent with other emission-line studies of $z\sim2$ field galaxies. From these data we estimate virial, stellar, and gas masses and derive correlations between these properties for cluster and field galaxies at $z\sim2$. We find evidence that baryons dominate within the central effective radius. However, we find no statistically significant differences between the cluster and the field, and conclude that the kinematics of star-forming galaxies at $z\sim2$ are not significantly different between the cluster and field environments.