Astrolunch: Shmuel Bialy

Date: 
Sun, 08/11/2020 - 17:00 to 18:00



How stars form in the turbulent-multiphase interstellar medium?


I will begin with a broad review of the field of star formation and its relation to galaxy evolution pointing to some pressing open questions.
I will then dive into the star-forming interstellar medium (ISM), asking the question, which process may regulate star formation?
I will discuss the multiphase structure of the ISM, key heating-cooling and chemical processes, and interstellar turbulence, all of which may play an important role in regulating star formation.
I will focus on a particularly appealing theory for star formation where gas heating by far-UV radiation from young stars (and by cosmic-rays in some galaxies), may provide a natural feedback loop, and thus organically self-regulate star-formation in galactic disks, and present recent results (Bialy 2020, ApJ accepted) for the link between the star-formation rate and the far-UV radiation intensity.
I will conclude with future prospects: 

(1) Charting new ways for observationally constraining poorly known interstellar properties: turbulence, 3D ISM structure, supernova feedback and cosmic-rays, and (2) first steps towards constructing an improved star-formation model for next-generation large scale cosmological simulations (i.e., IllustrisTNG successors).

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