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

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14 Citations (Scopus)


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 o) = 9.0-11.0, 28 of which are members of a known overdensity at z = 2.095. We measure H emission-line integrated velocity dispersions (σ int) 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.

Original languageEnglish
Article numberL2
Pages (from-to)1-6
Number of pages6
JournalAstrophysical Journal Letters
Issue number1
Publication statusPublished - 1 Jul 2016


  • galaxies: evolution


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