ZFIRE: THE KINEMATICS OF STAR-FORMING GALAXIES AS A FUNCTION OF ENVIRONMENT AT z ∼ 2

By Leo Y. Alcorn, K. Tran, G. Kacprzak, T. Nanayakkara, C. Straatman, T. Yuan, R. Allen, M. Cowley, R. Dav'e, Karl Glazebrook and 5 more. 2016

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We perform a kinematic analysis of galaxies at z ∼ 2 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⋆/M⊙) = 9.0–11.0, 28 of which are members of a known overdensity at z = 2.095. We measure Hα emission-line integrated velocity dispersions (σint) from 50 to 230 km s−1, consistent with other emission-line studies of z ∼ 2 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 ∼ 2. 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 ∼ 2 are not significantly different between the cluster and field environments.

Subfields: Astronomy and Astrophysics