ZFIRE: 3D Modeling of Rotation, Dispersion, and Angular Momentum of Star-forming Galaxies at z∼2
Article
Article Title | ZFIRE: 3D Modeling of Rotation, Dispersion, and Angular Momentum of Star-forming Galaxies at z∼2 |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Alcorn, Leo Y., Tran, Kim-Vy, Glazebrook, Karl, Straatman, Caroline M., Cowley, Michael, Forrest, Ben, Kacprzak, Glenn G., Kewley, Lisa J., Labbé, Ivo, Nanayakkara, Themiya, Spitler, Lee R., Tomczak, Adam and Yuan, Tiantian |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 858 (1), pp. 1-18 |
Article Number | 47 |
Number of Pages | 18 |
Year | 2018 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/aaba78 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/aaba78 |
Abstract | We perform a kinematic and morphological analysis of 44 star-forming galaxies at z ∼ 2 in the COSMOS legacy field using near-infrared spectroscopy from Keck/MOSFIRE and F160W imaging from CANDELS/3D-HST as part of the ZFIRE survey. Our sample consists of cluster and field galaxies from 2.0 < z < 2.5 with K-band multi-object slit spectroscopic measurements of their Hα emission lines. Hα rotational velocities and gas velocity dispersions are measured using the Heidelberg Emission Line Algorithm (HELA), which compares directly to simulated 3D data cubes. Using a suite of simulated emission lines, we determine that HELA reliably recovers input S 0.5 and angular momentum at small offsets, but V 2.2/σ g values are offset and highly scattered. We examine the role of regular and irregular morphology in the stellar mass kinematic scaling relations, deriving the kinematic measurement S 0.5, and finding with no significant offset between morphological populations and similar levels of scatter (∼0.16 dex). Additionally, we identify a correlation between M ∗ and V 2.2/σ g for the total sample, showing an increasing level of rotation dominance with increasing M ∗, and a high level of scatter for both regular and irregular galaxies. We estimate the specific angular momenta (j disk) of these galaxies and find a slope of 0.36 ± 0.12, shallower than predicted without mass-dependent disk growth, but this result is possibly due to measurement uncertainty at M ∗ < 9.5 However, through a Kolmogorov-Smirnov test we find irregular galaxies to have marginally higher j disk values than regular galaxies, and high scatter at low masses in both populations. |
Keywords | galaxies: evolution; galaxies: high-redshift; galaxies: kinematics and dynamics |
Funder | National Science Foundation |
Byline Affiliations | Texas A&M University, United States |
University of New South Wales | |
Swinburne University of Technology | |
Max Planck Society, Germany | |
Australian Astronomical Observatory, Australia | |
Macquarie University | |
Australian National University | |
Leiden University, Netherlands | |
University of California, United States |
https://research.usq.edu.au/item/w45wx/zfire-3d-modeling-of-rotation-dispersion-and-angular-momentum-of-star-forming-galaxies-at-z-2
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