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UID:Baylor_CMS_Event-82920
DTSTAMP:20260609T162854Z
SUMMARY:2013 Spring Physics Colloquium Series - Weighing and Measuring Galaxy Clusters, the Most Massive Objects in the Universe Lindsay King, Ph.D.
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:2013 Spring Physics Colloquium Series - Weighing and Measuring Galaxy Clusters, the Most=0D=0A=
Massive Objects in the Universe Lindsay King, Ph.D.=0D=0A=
Associate Professor, Department of Physics=0D=0A=
University of Texas at Dallas=0D=0A=
=0D=0A=
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Galaxy clusters are the most massive bound objects in the universe, and most of=0D=0A=
their mass is dark matter that cannot be seen directly with telescopes. Most of=0D=0A=
their normal baryonic luminous matter is hot X-ray emitting gas, that enshrouds=0D=0A=
clusters. Stars that shine in galaxies, seen using optical telescopes, account for a=0D=0A=
smaller amount of this normal matter. Being able to map out the mass in=0D=0A=
clusters allows key tests of our paradigm for structure formation in the=0D=0A=
universe, and of the properties of dark matter itself. My talk will begin with an=0D=0A=
outline of how strong and weak gravitational lensing signatures are used as a=0D=0A=
tool to study cluster structure. I will then discuss facets of our theoretical and=0D=0A=
observational research in this area.=0D=0A=
=0D=0A=
=0D=0A=
One topic that we will consider is how the physics of baryonic matter impacts=0D=0A=
on the distribution of mass (and hence lensing signatures) in clusters formed in=0D=0A=
hydrodynamic computer simulations. In particular, I will discuss the importance=0D=0A=
of the physics of supermassive black holes, hosted by cluster galaxies, in=0D=0A=
shaping lensing signatures such as the number of giant arcs - highly magnified=0D=0A=
and distorted images of distant galaxies.=0D=0A=
=0D=0A=
=0D=0A=
Over the past few years, it has been discovered that "Bullet Clusters" offer a new=0D=0A=
window on dark matter as well as testing gravity on large scales. These are the=0D=0A=
most energetic events since the big bang, comprising two or more clusters that=0D=0A=
have collided in the past - so violently that their dark matter and hot X-ray gas=0D=0A=
have been separated. Only a handful of these events are known, and we will=0D=0A=
focus on Abell 2146, a unique system that we are currently investigating.=0D=0A=
=0D=0A=
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Room E.125, Baylor Sciences Building=0D=0A=
Reception at 3:40 p.m. in BSB D.311=0D=0A=
For more information contact:=0D=0A=
Dr. Anzhong Wang 254-710-2276=0D=0A=
=0D=0A=

LOCATION:Room E.125, Baylor Sciences Building
DTSTART;TZID=US_Central:20130320T160000
DTEND;TZID=US_Central:20130320T170000
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