S317p.67 — On the formation of polar ring galaxies and tidal dwarf galaxies in gas-rich galaxy groups

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Virginia Kilborn3, Sarah Sweet1, Gerhardt Meurer2, Michael Drinkwater4

Institution(s): 1. Australian National University, 2. ICRAR - University of Western Australia, 3. Swinburne University of Technology, 4. University of Queensland

We are conducting a study of the properties of galaxies and dwarfs in 16 gas-rich galaxy groups identified in the Survey for Ionization in Neutral Gas Galaxies (SINGG; Meurer et al. 2006). We have found a young gas-rich coalescing galaxy group, J1051-17. Key features of this system are gas-rich tidal tails, studded with dwarf galaxies extending 200 kpc which merge in to a low surface brightness polar disk orbiting a very red edge-on host hosting a central AGN. Accretion from the polar disk may be feeding the AGN and powering a galactic wind. The example of this system suggests that tidal interactions with gas rich satellites may be a key process that aligns satellites in to polar planes while fuelling accretion down to the very centres of the host. We discuss the formation scenario of this polar ring galaxy, and investigate the formation of tidal dwarf galaxies in the wider group sample.