Report
ZFIRE: 3D Modeling of Rotation, Dispersion, and Angular Momentum of Star-Forming Galaxies at z~2
| العنوان: | ZFIRE: 3D Modeling of Rotation, Dispersion, and Angular Momentum of Star-Forming Galaxies at z~2 |
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| المؤلفون: | 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, Yuan, Tiantian |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We perform a kinematic and morphological analysis of 44 star-forming galaxies at $z\sim2$ 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 H$\alpha$ emission lines. H$\alpha$ 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 $V_{2.2}/\sigma_g$ 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 $\log(S_{0.5}) = (0.38\pm0.07)\log(M/M_{\odot}-10) + (2.04\pm0.03)$ with no significant offset between morphological populations and similar levels of scatter ($\sim0.16$ dex). Additionally, we identify a correlation between M$_{\star}$ and $V_{2.2}/\sigma_g$ for the total sample, showing an increasing level of rotation dominance with increasing M$_{\star}$, 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 $0.36\pm0.12$, shallower than predicted without mass-dependent disk growth, but this result is possibly due to measurement uncertainty at M$_{\star}$ $<$ 9.5. However, through a K-S test we find irregular galaxies to have marginally higher $j_{disk}$ values than regular galaxies, and high scatter at low masses in both populations. Comment: Accepted to ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/aaba78 |
| URL الوصول: | http://arxiv.org/abs/1804.03669 |
| رقم الانضمام: | edsarx.1804.03669 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/aaba78 |
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