2016 schedule

Sun 14:30-15:00
Theatre 104

Deeply imaging interacting galaxies to detect tidal features

John Drummond

Royal Astronomical Society of New Zealand (vice president). Possum Observatory.

Luminous features surrounding peculiar galaxies have been imaged since the early 1900s. Their nature has become clearer as our understanding of galaxy evolution developed in the light of merger models from the Toomre brothers' work in the 1970s. I present findings after deeply imaging southern galaxies in an attempt to detect tidal streams in galactic halos resulting from gravitational interactions and passages between galaxies of similar or disproportional mass ratios. These images of many hours' exposure time were subjected to severe processing and then inverted to reveal as much tidal disruption as possible.