با عرض تبریک سال نو و آرزوی سالی سرشار از شادی و تندرستی و پیروزی، به اطلاع می‌رسانم سمینار این هفته را خانم دکتر سمیه شیخ نظامی از پژوهشکده نجوم پژوهشگاه دانش‌های بنیادی (IPM) ارائه خواهند کرد. عنوان و چکیدهٔ سمینار ایشان به شرح زیر است:

Jets and outflows: Theory, Observation, Simulations

 

Abstract: Jets are powerful signatures of astrophysical activity and are observed over a wide range of luminosity and spatial scale. Typical jet sources are young stellar objects (YSOs), micro-quasars, and active galactic nuclei (AGNs), while there are indications of jet motion also for a few pulsars and for gamma-ray bursts. In the first part of the talk, I give a brief introduction on astrophysical jets, their formation and acceleration. In the next part of the talk, I present our recent results of the first ever three-dimensional (3D) magneto-hydrodynamic (MHD) simulations of the accretion–ejection structure. The 3D evolution of jets launched symmetrically from single stars but also jets from warped disks in binary systems have been studied. Various model setups have been applied and tested by simulating a stable and bipolar symmetric 3D structure from a single star–disk–jet system. Our simulations show typical 3D deviations from axial symmetry, such as jet bending outside the Roche lobe or spiral arms forming in the accretion disk.

 

این سمینار در روز یکشنبه ۱۵ فروردین ماه ۱۳۹۵، ساعت ۱۵ در اتاق ۵۱۷  در طبقهٔ پنجم دانشکدهٔ فیزیک برگزار خواهد شد.