سمینار این هفته را آقای معین مصلح از پژوهشکده نجوم پژوهشگاه دانش های بنیادی IPM برگزار خواهند کرد. عنوان و چکیدهٔ سمینار ایشان به شرح زیر است:
مطالعه تحول رابطه‌ی جرم ستاره‌ای و اندازه‌ی کهکشانها در طی ۱۲ میلیارد سال گذشته
( The Evolution of the Mass-Size Relation of Galaxies over the last 12 Billion years )
Abstract:
One of the key unsolved problems in astrophysics is to understand the formation and evolution of galaxies. There are many complementary approaches to study the evolution of galaxies and infer how distant galaxies are connected to galaxies in the present day universe. These canonical ways are either focused on the evolution of luminosity/mass function, star formation rate density, or the evolution of the observed scaling relations of galaxies. Among the scaling relations, the relation between the stellar mass and sizes of galaxies has considerable importance. Evidence is provided by many recent studies that the size of galaxies were smaller at higher redshifts compared to galaxies of similar mass in the local Universe. Studying these galaxy properties at different epochs can place important constrains on the underlying processes assumed for the galaxy mass and structural evolution. In this talk, I will present the study of the mass-size evolution of galaxies from redshift z=7 to z=1 and the stellar mass-size relation for nearby galaxies (z=0). I will also discuss about the robustness of size measurement techniques for low and high-redshift galaxies.
این سمینار در روز یکشنبه هفتم اردیبهشت ماه ۱۳۹۳، ساعت ۱۵ در اتاق شورا در طبقهٔ پنجم دانشکدهٔ فیزیک برگزار خواهد شد.