경희대학교 BK21

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● 날짜 : 2014년 11월 25일 (화요일)
● 시간 : 오전 16시 30분
● 장소 : 천문대 영상실
● 강사 : Dr. Jeong-Sun Hawng - Kyung Hee University
● 주제 : Effects of hot halo gas on the star formation and mass transfer during distant galaxy-galaxy encounters

 

  Both X-ray observations and cosmological hydrodynamic simulations have reported that not only elliptical galaxies but also some spiral galaxies like our own Milky Way Galaxy possess hot diffuse gas in the surrounding halo. Thus, the gaseous halo acts as a large gas reservoir for the galaxy and can play a vital role in galaxy evolution through hydrodynamical processes. So far, almost all hydrodynamical simulations of galaxy interactions have considered only on the cold gas and collisionless components in the initial conditions. In addition, while the effects of galaxy mergers have been more intensely studied, the interest in a whole variety of interactions including flyby and distant encounters are growing only recently. I and my collaborators have been performing numerical studies on various interactions between galaxy pairs including a hot gas halo in our galaxy models. In this talk, I will present N-body/SPH simulations on distant encounters between an early- and a late-type galaxy, emphasizing how halo gas can make differences in the star formation rate, development of the tidal bridge, and mass transfer during the encounters.