Understanding the nature of barred galaxies: From morphology to dynamics

علیرضا مولایی نژاد (پژوهشکده نجوم پژوهشگاه دانش های بنیادی (IPM) )

Abstract:   Barred galaxies represent a considerable fraction of the entire disc galaxy population.  Bars could be considered as the key drivers of the internal secular evolution in disc galaxies by redistribution of the angular momentum and triggering of star formation, or changing the morphological structure of disk galaxies.  In edge-on or highly inclined systems, bars are most easily recognized by boxy and peanut-shapes, and sometimes X-shape morphology formed by the stellar material above the disc plane. BP bulges specifically and bars in general produce distinct kinematic features that can be easily detected in galaxies.  I will present our recent results of the study on the stellar kinematics and populations of a sample of intermediate inclined disk galaxies, obtained with the SAURON integral-field spectrograph on the 4.2m William Herschel Telescope. I will also discuss our approach to unveil hidden bars and inner disks on the basis of their kinematics and introduce a method to quantify the cylindrical rotation, as a common kinematics feature of barred galaxies. The results of this study allow us to establish the link between the stellar kinematics and populations of bulges and bars with their surrounding thin and thick disks, and relate them to the properties observed in disk galaxies.

یکشنبه 9 خرداد ماه 1395، ساعت 15:00

دانشکده فیزیک، طبقه پنجم اتاق 517