New Results on Galaxy Mergers: Galaxy Formation, Cosmology, and Gravitational Waves

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• Christopher Conselice (University of Nottingham)
• Tuesday 10 March 2020, 16:00-17:00
• Sackler Lecture Theatre, Institute of Astronomy, Madingley Rise.

If you have a question about this talk, please contact Asa Bluck.

I will present new results on observed galaxy mergers using a few different surveys and projects. The first is a galaxy pair methodology within the REFINE survey – an analysis of the 3 deepest large near-infrared extragalactic fields. I will discuss the role of both major and minor mergers in the formation of galaxies up to z~6. I will then discuss new results using machine learning on the Illustris cosmological simulation to determine the merger history with deep learning by training a machine on the simulation and then applying the supervised learning to resolved imaging data from the Hubble Space Telescope. I will show that these two methods of finding mergers are consistent and provides further evidence for the existence of dark matter in a new way. I will also discuss how these results provide unique information about the origin of gravitational waves discovered by LIGO /VIrgo and predictions for the number of sources that LISA will discover at high redshift.

This talk is part of the Kavli Institute for Cosmology Seminars series.

This talk is included in these lists:

• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Sackler Lecture Theatre, Institute of Astronomy, Madingley Rise

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