関西光量子科学研究所 >> KPSIセミナー >>Magnetized Radiative shocks: their role in global evolution of interstellar medium
セミナー
第108回KPSIセミナー(現地及びweb開催)
Magnetized Radiative shocks: their role in global evolution of interstellar medium
講演者 |
LULI - CNRS, Ecole Polytechnique Research Direcor Dr.Michel Koenig |
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日時 |
2024年9月30日(月)13時30分~ |
会場 | 大会議室 (A119) およびオンライン |
使用言語 | 英語 |
要旨 | [PDFファイル/33KB] |
Research Direcor Dr.Michel Koenig
LULI - CNRS, Ecole Polytechnique
概要(Abstract)
In astrophysics, many phenomena involving strong radiative shocks (RS) disturb and inject energy into the interstellar medium, affecting the rate of star formation in galaxies. For instance, the compression and disturbance of the interstellar gas caused by shocks from supernova explosions can trigger the collapse of nearby molecular clouds, initiating the formation of new stars. Therefore, the interaction of strong radiative shock waves with other structures is a central problem in astrophysics. Moreover, magnetic fields play an important role additionally to radiation for example in protogalaxies giving rise to globular clusters. It also can stabilize thermal instability with a transverse magnetic field. Recent results of radiative shock (and their interaction with an obstacle) experiments on laser facilities are shown where we have measured many of the variables involved such as shock velocity, radiative precursor length and temperature, ablation of an obstacle by the radiation, shock generated in the obstacle after shock impact. In the meanwhile, we performed 2d numerical investigations using FLASH code when an external B field is present. In the case of radiative magnetised shock, we do observe the generation of a magnetosonic wave ahead of the RS for a B field perpendicular to the shock propagation. Discussion on the impact in astrophysics will be presented.
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