Ionized and molecular gas kinematics in a z=1.4 star-forming galaxy

التفاصيل البيبلوغرافية
العنوان: Ionized and molecular gas kinematics in a z=1.4 star-forming galaxy
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
الوصف
DOI:10.3847/2041-8213/aaacfa