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Astronomy Colloquium
Interstellar Shocks
Date: Thursday, February 4th
Time: 10:00 am - 11:00 am
Place: Zoom meeting(see Abstract ) SPECIAL TIME 10AM
Speaker: Antoine Gusdorf, Laboratoire de Physique de l’École Normale Supérieure & Paris Observatory, Paris, France
Abstract: The interstellar medium is an out-of-equilibrium medium, where energy is constantly injected in various forms: mechanical energy, photons, or cosmic rays. The propagation of shock waves is ubiquitous in the interstellar medium, where it represents an important part of the mechanical energy input. For instance, interstellar shocks are generated by the birth (jets and bipolar outflows), life (stellar winds) or death (supernova and supernova remnants) of certain stars, or by the formation of molecular clouds (converging flows). In this talk, I propose to review the progresses in our knowledge of the propagation of shocks in the interstellar medium. These progresses have been made possible by more and more efficient telescopes in various wavelengths (Spitzer, Herschel, SOFIA, ALMA, NOEMA, APEX, the IRAM-30m telescope…), and also by the developments of sophisticated models. I will illustrate how observations of various species has progressively led us to include non-stationarity effects, new geometries, and new physical and chemical processes in shock models to better address the classical questions related to the propagation of shocks: What kind of chemistry is operating in shocked regions, and hence what is their contribution to the cycle of matter in the Galaxy ? What is the energetic impact and feedback of shocks on their local environment ? What is their contribution to the energetic balance of galaxies ? What can shock tell us about scenarios of star formation ?
Host: Professor Snezana Stanimirovic
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