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Jan 18 |
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No talk scheduled: Martin Luther King, Jr. Holiday: University Closed
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Jan 25
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J. Craig Wheeler
University of Texas at Austin
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Organizational Meeting
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Feb 1 |
J. Craig Wheeler
University of Texas at Austin |
"The Brightest Supernova Ever"
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Coral Wheeler
University of California, Irvine |
"Sweating the Small Stuff: Simulating Dwarf Galaxies, Ultra-faint Dwarf Galaxies, and their own Tiny Satellites"
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Feb 8 |
Milos Milosavljevic
University of Texas at Austin |
"Can we Reverse-Engineer Nucleosynthesis?"
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Aaron Smith
University of Texas at Austin |
"Probing the Primordial Universe with the Lyman Alpha Emitter CR7"
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Feb 15 |
Benny Tsang
University of Texas at Austin |
"Radiation Hydrodynamics of Super Star Cluster Formation"
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Volker Bromm
University of Texas at Austin |
"The Mystery of CR7"
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Feb 22 |
Alexander Tchekhovskoy
University of California, Berkeley |
"New Frontiers in Simulating Black Hole Accretion and Jets"
abstract
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Feb 29
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Brandon Bozek
University of Texas at Austin |
"Dark Matter Models in the Local and High-z Universe"
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Manos Chatzopoulos
University of Chicago |
"Emission from Pair Instability Supernovae with Rotation"
abstract
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Mar 7 |
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No talk scheduled.
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Mar 14 |
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No talk scheduled: Spring Break.
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Mar 21 |
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No talk scheduled
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Mar 28 |
Richard Matzner
UT Austin, Dept. of Physics |
"LIGO" followed by an Open Discussion of LIGO Results and Implications
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Apr 4 |
Michael Boylan-Kolchin
University of Texas at Austin |
"High-redshift Science in the Local Group"
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Wenbin Lu
University of Texas at Austin |
"Tidal disruption events and the black hole event horizon"
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Apr 11 |
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No talk scheduled
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Apr 18 |
J. Craig Wheeler
University of Texas at Austin |
"Moderated open discussion of LIGO and the beginning of gravitational-wave astrophysics. (Come with questions, perspectives and plans)"
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Apr 25 |
Bohua Li
University of Texas at Austin
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"Complex scalar field dark matter and stochastic gravitational wave background from inflation"
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Alex Fitts
University of Texas at Austin |
"FIRE in the Field: Simulating the Threshold of Galaxy Formation"
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May 2 |
Yi-Kuan Chiang
University of Texas at Austin |
PhD Defense Presentation
"Galaxy Proto-Clusters as an Interface between Structure, Cluster, and
Galaxy Formation"
Proto-clusters, the progenitor large-scale structures of present day
galaxy clusters, are unique laboratories to study dark matter assembly,
cosmic baryon cycle, galaxy growth, and the environmental impacts on
galaxy evolution. In this dissertation, I will present our recent
progress in this subject, both theoretical and observational. Using a
set of cosmological N-body simulations and semi-analytic galaxy models,
we extract the mass, size, overdensity, galaxy growth for ~3000
simulated clusters from z=7 to z=0. I will demonstrate an extreme cosmic
downsizing in proto-clusters using both their internal galaxy evolution
and their global contribution to the cosmic star formation.
Observationally, I will focus on the epoch of z~2 right beyond the limit
of classical X-ray and SZ effect studies of compact, mature clusters. We
perform a systematic proto-cluster search using large 15 cMpc-scale
cosmic density field traced by galaxies with photometric redshifts in
the COSMOS field, revealing a large sample of 36 candidate
proto-clusters at 1.6<z<3.1. This sample has already let to a rich
series of follow up or independent work in the literature. I will
present the confirmation and detailed characterization of a
"proto-Virgo" cluster in this field at z=2.44 using a sample of Lya
emitters (LAE) in the HETDEX Pilot Survey. Compared to the cosmic mean,
this structure shows a LAE overdensity of 4 on a scale of few tens cMpc,
a 5 times higher fraction of extended Lya blobs, a 2 times higher median
stellar mass, and a significantly enhanced intergalactic gas. With these
results, I will discuss proto-clusters in the context of cluster
formation and galaxy evolution, highlighting their unique roles linking
scales from large to small, and epochs form active star-formation to
quenching. close
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