تقرير
Ionized and molecular gas kinematics in a z=1.4 star-forming galaxy
العنوان: | Ionized and molecular gas kinematics in a z=1.4 star-forming galaxy |
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المؤلفون: | Übler, Hannah D. N., Genzel, Reinhard, Tacconi, Linda J., Schreiber, Natascha M. Förster, Neri, Roberto, Contursi, Alessandra, Belli, Sirio, Nelson, Erica J., Lang, Philipp, Shimizu, T. Taro, Davies, Ric, Herrera-Camus, Rodrigo, Lutz, Dieter, Plewa, Philipp M., Price, Sedona H., Schuster, Karl, Sternberg, Amiel, Tadaki, Ken-ichi, Wisnioski, Emily, Wuyts, Stijn |
سنة النشر: | 2018 |
المجموعة: | Astrophysics |
مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
الوصف: | We present deep observations of a $z=1.4$ massive, star-forming galaxy in molecular and ionized gas at comparable spatial resolution (CO 3-2, NOEMA; H$\alpha$, LBT). The kinematic tracers agree well, indicating that both gas phases are subject to the same gravitational potential and physical processes affecting the gas dynamics. We combine the one-dimensional velocity and velocity dispersion profiles in CO and H$\alpha$ to forward-model the galaxy in a Bayesian framework, combining a thick exponential disk, a bulge, and a dark matter halo. We determine the dynamical support due to baryons and dark matter, and find a dark matter fraction within one effective radius of $f_{\rm DM}(\leq$$R_{e})=0.18^{+0.06}_{-0.04}$. Our result strengthens the evidence for strong baryon-dominance on galactic scales of massive $z\sim1-3$ star-forming galaxies recently found based on ionized gas kinematics alone. Comment: accepted for publication in the Astrophysical Journal Letters |
نوع الوثيقة: | Working Paper |
DOI: | 10.3847/2041-8213/aaacfa |
URL الوصول: | http://arxiv.org/abs/1802.02135 |
رقم الأكسشن: | edsarx.1802.02135 |
قاعدة البيانات: | arXiv |
DOI: | 10.3847/2041-8213/aaacfa |
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