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College of Arts & Sciences
Physics and Astronomy


Colloquium: "Almost Dark Galaxies"

Thursday, October 12, 2017 - 16:00 to 17:15

Speaker:

Dr. Donald G. York
Horace B. Horton Professor Emeritus
Department of Astronomy and Astrophysics
University of Chicago
Chicago, IL

 

Abstract:

Dwarf galaxies are known to generally consist of a higher fraction of dark matter than normal galaxies.  A few are known with most of the baryons in the form of gas rather than stars.  Given the right conditions, they might be perfect sources as the origin of QSO absorption lines.  I will discuss the QSO absorption lines and the reason to consider a new, exotic source for their origin.  Then, I will describe some big data experiments to seek out such galaxies, and the necessary follow-up observations.  This work is ongoing with Pranav Sivakumar.


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