Colloquium Details

Jielai Zhang (University of Toronto)

"Exploring the low surface brightness Universe with the Dragonfly Telephoto Array"

The low surface brightness Universe is largely unexplored. The limiting factors for low surface brightness observations are not photon statistics or image resolution, instead they are systematic factors such as a telescope’s internal reflections, sky subtraction, flat fielding and the wide-angle point-spread-function. The Dragonfly Telephoto Array addresses these factors by a combination of hardware and software. The telescope consists of 48 commercial Canon telephoto lenses, and is able to see low surface brightness structures about 10 times fainter than previously possible with its 2.4 x 3.2 degree wide field of view. I will describe the technology behind Dragonfly, and how I and my team have used it to discover enormous stellar disks, properties of interstellar dust and ultra-diffuse-galaxies.

Held at 11:00AM on Thursday 8th February, 2018 in the AAO Meeting Room (Room 7, 1st Floor, Building 2)