Colloquia Schedule Spring 2017

Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B

Jan. 17

One Minute Colloquium

Astronomy Department and McDonald Observatory Personnel

The University of Texas at Austin

Organizer: Brendan Bowler

Jan. 24

The OSIRIS-REx Asteroid Sample Return Mission


Ed Beshore

The University of Arizona Lunar and Planetary Laboratory

host: Anita Cochran

Jan. 31

Observing the Evolution of Solids in Protoplanetary Disks


Sean Andrews

Harvard-Smithsonian Center for Astrophysics

host: Adam Kraus

Feb. 7

Theory Frontiers Meeting

POB 2.402

Feb. 14

Faculty Candidate Talks

moved to Theory Seminar and ExGal Seminar Slots

Feb. 21

Faculty Candidate Talks

moved to Theory Seminar and ExGal Seminar Slots

Feb. 28

Faculty Candidate Talks

moved to Theory Seminar and ExGal Seminar Slots

Mar. 7

Faculty Candidate Talks

moved to Theory Seminar and ExGal Seminar Slots

Mar. 14

Spring Break
No colloquium

Mar. 21

External Review
No colloquium

Mar. 28

PostDoc Colloquium (3 talks)

Effect of supersonic gas streams on the primordial star formation

Shingo Hirano, The University of Texas at Austin

IGRINS (the traveling spectrometer) and what it can tell us about YSOs

Kim Sokal, The University of Texas at Austin

A Faint Flux-Limited LAE Sample at z = 0.3

Isak Wold, The University of Texas at Austin

host: Mike Boylan-Kolchin

Apr. 4

Debris Disks: Tracers of Planet Formation


Kate Su

The University of Arizona Steward Observatory

Harriet Dinerstein/Adam Kraus

Apr. 11

Small Planets Transiting Nearby Small Stars


Zach Berta-Thompson

University of Colorado, Boulder

host: Cynthia Froning

Apr. 18

The Grand Planetary Ensemble


Sarah Ballard

MIT Kavli Institute

host: Michael Endl

Apr. 25

The Growth of the Most Massive Galaxies in the Highest Density Regions: Evidence for In-Situ Star Formation in SpARCS Brightest Cluster Galaxies

The most massive galaxies in the local universe reside at the centres of galaxy clusters. Often called Brightest Cluster Galaxies (BCGs), they exhibit, as a class, highly uniform properties and are distinct from the general galaxy population. This suggests formation processes which are themselves distinct from those which dominate in massive galaxies outside of cluster cores. The mass growth of BCGs is likely linked to the overall physics of hierarchical structure formation on galaxy cluster scales, including the fundamental processes of gas cooling, star formation, energy feedback and galaxy mergers, at the centers of giant dark matter halos. In this talk I will present new results from the largest study of high-redshift BCGs conducted to date, drawn from the SpARCS optical/NIR cluster survey. Using archival infrared data we show the star formation rate within BCGs increases to z~2, and can add as much mass to the BCG population as the previous standard model of growth by dry mergers. At low redshifts, and in X-ray/SZ selected clusters, the rare examples of star forming BCGs appear to be fed by large-scale cooling flows. However, the first of the SpARCS systems we have studied in detail, SpARCS1049, has revealed a very different phenomenon - a train-wreck of a galaxy merger at the center of the cluster. This is the first example of such a process in high-redshift cluster cores and may represent a new phase of BCG evolution, previously unaccounted for.


Tracy Webb

McGill University

host: Caitlin Casey

May 2

Title: TBA

Lisa Prato

Lowell Observatory

host: Fritz Benedict

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8 December 2016
Astronomy Program · The University of Texas at Austin
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