Title of Dissertation: AN EFFICIENT METHOD FOR RADIATION HYDRODYNAMICS IN MODELS OF FEEDBACK-REGULATED STAR FORMATION Michael Aaron Reed Skinner, Doctor of Philosophy, 2013 Dissertation directed by: Professor Eve C. Ostriker Department of Astronomy We describe a module for the Athena code that solves the gray equations of radiation hydrodynamics (RHD), based on the first two moments of the radi...

We show that the mass fraction of giant molecular cloud (GMC) gas (n 100 cm−3) in dense (n 104 cm−3) star-forming clumps, observable in dense molecular tracers (LHCN/LCO(1–0)), is a sensitive probe of the strength and mechanism(s) of stellar feedback, as well as the star formation efficiencies in the most dense gas. Using high-resolution galaxy-scale simulations with pc-scale resolution and exp...

It is considered an improper integral that determines the high-frequency asymptotics of spectral energy distribution equilibrium radiation in ideal electron gas. has been established "high-frequency" limit this a power-law character, and its value proportional to density gas as function temperature chemical potential for arbitrary degeneracy electrons. Keywords: radiation, dis...

We present new computations of the equilibrium and non-equilibrium cooling efficiencies and ionization states for low-density radiatively cooling gas containing cosmic abundances of the elements H, He, C, N, O, Ne, Mg, Si, S, and Fe. We present results for gas temperatures between 10 and 10 K, assuming dust-free and optically thin conditions, and no external radiation. For non-equilibrium cooli...

The expected episodic or intermittent star formation histories (SFHs) of gas rich dwarf irregular galaxies (dIrrs) are the longstanding puzzles to understand their whole evolutional history. Solving this puzzle, we should grasp what physical mechanism causes the quiescent phase of star formation under the very gas rich condition after the first starburst phase. We consider that this quiescent p...

Recent measurements of a 2D electron gas subjected to microwave radiation reveal a magnetoresistance with an oscillatory dependence on the ratio of radiation frequency to cyclotron frequency. We perform a diagrammatic calculation and find radiation-induced resistivity oscillations with the correct period and phase. Results are explained via a simple picture of current induced by photoexcited di...

Excimers, known from electron beam experiments and UV lasers, can also fomi in silent discharges, a discharge type used for large-scale ozone production. In this high pressure non-equilibrium discharge a dielectric barrier leads to the formation of localized short-lived microdischarges. Inside the microdischarge filaments energetic electrons can excite rare gas (RG) atoms which, under appropria...