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[서울대] Small Nascent Galaxies in the Debris of Interacting Systems

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일시 2015-05-21
장소 Room #212 (in Building #19)
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Abstract TItle _ Small Nascent Galaxies in the Debris of Interacting Systems

Speaker _ Dr. Chandreyee Sengupta (KASI)

Date _ May 21(Thu), 2015, 4:15pm~

Place _ Room #212 (in Building #19)


Abstract

Tidal interactions between pairs of galaxies, where at least one of them is gas rich, can result in tidal stripping of large amounts of HI from their parents’ potential. Most of this stripped HI will eventually fall back into the potential of one of the pair or the new galaxy formed by their merger or be incorporated into the intra–group medium (IGM). But if the HI densities are sufficient and environmental conditions are favourable, self-gravitating bodies with masses typical of dwarf galaxies, called Tidal Dwarf Galaxies (TDG), may form within the tidally stripped gas. Their young stars form from tidally stripped gas and therefore present higher met*llicities compared to normal dwarfs. Modelling of TDG formation predicts their dark matter content to be much lower than in normal dwarfs. As nascent galaxies, these obj*cts are ideal laboratories to study star formation, star-gas correlation, galaxy formation and effects of the absense of dark matter on galaxy and star formation. Using the Giant Metrewave Radio Telescope (GMRT), we are conducting an HI survey of a sample of interacting systems, a subset of which host TDGs. I will be speaking about our results from this ongoing survey and how they help our current understanding of TDGs. Additionally I will discuss the usefulness as well as limitations of HI spectroscopy in TDG studies and the necessity of multiwavelength observations to understand TDGs.
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