Date

Speaker

Title

Jan 26

Milos Milosavljevic

University of Texas at Austin

Organizational meeting.

Feb 2

No talk scheduled.

Feb 9

Kyungjin Ahn

Chosun University, South Korea

(host: Paul Shapiro) "How First Stars Initiated Cosmic Reionization: Theory and Observation in the Era of Planck and the Square Kilometre Array"

First Stars are believed to be the very first astrophysical sources in the Universe. These stars form by hydrogen-molecule cooling predominantly inside mini-halos. Ultraviolet photons from these stars ionize surrounding atoms and form individual H II regions, which marks the "Cosmic Dawn" or the early phase of cosmic reionization. We present a suite of simulation results that modeled cosmic reionization in a large volume, ~(150 Mpc)^3, but also covering the full dynamical range of star-hosting halos, and show that first stars may have played a very important role in the history of reionization. We show that how the 2D sky map of polarization anisotropy of cosmic microwave background, measured by Planck, can be used to quantify the contribution of first stars to reionization. We also suggest that highly-clustered first stars and their impact on the intergalactic medium can be directly probed through a 3D imaging observation by the Square Kilometre Array.

close

Feb 16

No talk scheduled.

Feb 23

No talk scheduled.

Mar 2

Hyunbae Park

University of Texas at Austin

"Revisiting Transverse Peculiar Momentum Power Spectrum in the Non-linear Regime: Implications for the Post-reionization Kinetic Sunyaev-Zel'dovich Effect"

abstract

Mar 9

No talk scheduled. Special Faculty & Research Scientist Meeting

Mar 16

No talk scheduled. Spring Break: 16-20 March 2015.

Mar 23

Monday 23 March, 2015, 3:30 p.m.
JOINT THEORETICAL ASTROPHYSICS/PHYSICS THEORY GROUP SEMINAR:
Dr. Marcello Musso, University of Pennsylvania,
"Random Walks in the Sky: Theoretical Halo Statistics for Cosmology", RLM 15.216B.

abstract

Mar 30

Riley Connors

University of Amsterdam

"Jet Physics Across the Black Hole Mass Scale"

Apr 6

Alan Sluder

University of Texas at Austin

"The Physics and Chemistry of Dust Grain Formation in Core-Collapse Supernovae"

Apr 13

Brian Mulligan

University of Texas at Austin

"A Compact Circumstellar Shell as the Source of High-velocity Features in Type Ia Supernovae"

Apr 20

No talk scheduled.

Apr 27

No talk scheduled.

May 4

Taft Armandroff & Anita Cochran

McDonald Observatory

"Not A Theory Seminar: The Status of GMT"

abstract