Korean VLBI Network (KVN)

2014 Seminar:

08/08/2014   08/29/2014   09/19/2014   09/26/2014   10/24/2014   11/07/2014   11/21/2014   11/28/2014   12/05/2014  

Dr. Chandreyee Sengupta (KVN group)
Tidal dwarf galaxies in the debris of interacting system

Tidal interactions between gas rich galaxies can result in the displacement of large amounts of HI from the parent galaxy(s). Most of this stripped HI will eventually fall back into the potential of one or other of the interacting galaxies 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. Observing these exotic objects, during their formation from gas/star debris provides a unique opportunity to investigate the processes governing formation and evolution of galaxies as well as the role of dark matter in their formation.

To study in-situ star and TDG formation in tidal gas debris, we are carrying out an HI survey of a sample of interacting systems using the Giant Metrewave Radio Telescope (GMRT). In addition to the HI data from the GMRT, we are using the Sloan Digital Sky Survey (SDSS), Spitzer and Galaxy Evolution Explorer (GALEX) public data and images to understand the star/gas correlations in these objects. I will present results from three tidally interacting systems, Arp 181, Arp 202 and Arp 305. Each of these systems reveal interesting information on TDG formation.

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Korean VLBI Network (KVN)