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

Journal Article · Fri Jul 01 04:00:00 EDT 2016 · Astrophysical Journal Letters

DOI:https://doi.org/10.3847/2041-8205/825/1/L2· OSTI ID:22654285

Alcorn, Leo Y.; Tran, Kim-Vy H.; Quadri, Ryan ^[1]; Kacprzak, Glenn G.; Nanayakkara, Themiya; Allen, Rebecca J.; Glazebrook, Karl ^[2]; Straatman, Caroline; Labbé, Ivo ^[3]; Yuan, Tiantian; Kewley, Lisa J. ^[4]; Cowley, Michael; Spitler, Lee R. ^[5]; Davé, Romeel ^[6]; Tomczak, Adam ^[7]

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1. George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States)
2. Swinburne University of Technology, Hawthorn, VIC 3122 (Australia)
3. Leiden Observatory, Leiden University, P.O. Box 9513, NL 2300 RA Leiden (Netherlands)
4. Research School of Astronomy and Astrophysics, The Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia)
5. Australian Astronomical Observatory, P.O. Box 915, North Ryde, NSW 1670 (Australia)
6. University of the Western Cape, Bellville, Cape Town, 7535 (South Africa)
7. Department of Physics, University of California, Davis, CA, 95616 (United States)

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 {sub ⋆}/ M {sub ⊙}) = 9.0–11.0, 28 of which are members of a known overdensity at z = 2.095. We measure H α emission-line integrated velocity dispersions ( σ {sub int}) from 50 to 230 km s{sup −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.

• OSTI ID: 22654285
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 825; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BARYONS
CORRELATIONS
DISPERSIONS
EMISSION
EVOLUTION
GALAXIES
MASS
NEAR INFRARED RADIATION
SPECTROSCOPY
STARS
UNIVERSE
VELOCITY