Cake Talk by Mahsa Kohandel
I will talk about one of the recent puzzling issues in high-z galaxy dynamics studies, which is the existence of “dynamically cold disks” (i.e., rotation-dominated systems with a surprisingly large V/σ) at z>4. To understand whether such cold disks are predicted at even higher redshifts at the Epoch of Reionization (EoR), I will introduce a sample of EoR Lyman Break Galaxies from the SERRA suite of simulations, which spans an SFR range of 2 <SFR < 130 Msun/yr and a stellar-mass range of 10^8 - 10^10.3 Msun in a redshift range of 6 < z < 9. I will present our results analyzing the synthetic hyperspectral datacubes for the far-infrared [CII] and nebular Hα emission lines modeled for SERRA galaxies which is a first attempt to have predictions on the dynamical state of EoR galaxies that will be (are) probed by JWST (ALMA). One of the main conclusions is that the dynamical characterization of high-z galaxies is a multi-phase problem that requires spatially resolved observations of various phases of the ISM. Indeed, the [CII] emitting gas in SERRA is found to have large V/σ, consistent with being dynamically cold. At the same time, this is not the case for the Hα emission line, which traces outflows and extra-planar gas in addition to galactic disks.