Colloquia Schedule Spring 2014

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

Jan. 14

No talk scheduled.

abstract

Jan. 21

"The Connection between Star Formation and the Cold Interstellar Medium in Nearby Galaxies"

abstract

Karin Sandstrom

University of Arizona

host: Shardha Jogee

Jan. 28

"The Unusual Eclipser of the Young Star J1407: Moon-forming Circumplanetary Disk?"

abstract

Eric Mamajek

University of Rochester

host: TBA

Feb. 4

"A Calibration of the Stellar-mass Fundamental Plane at z = 0.4 using the Micro-lensing Induced Flux Ratio Anomalies of Macro-lensed Quasars"

abstract

Paul L. Schechter

Massachusetts Institute of Technology

host: Pawan Kumar

Feb. 11

Tinsley Visiting Scholar, Interstellar Matter Group

"Volatiles in Protoplanetary Disks"

abstract

Klaus Pontoppidan

Space Telescope Science Institute (STScI)

host: Neal Evans

Feb. 18

DeVaucouleurs Medalist: COLLOQUIUM

"Connecting Gas to Stars in Galaxies"

abstract

Robert C. Kennicutt, Jr.

University of Cambridge, UK

host: Neal Evans

Feb. 19
CPE 2.208
4:00 PM

DeVaucouleurs Medalist: PUBLIC LECTURE

"The Hidden Universe Revealed"

abstract

Robert C. Kennicutt, Jr.

University of Cambridge, UK

host: Neal Evans

Feb. 25

"The Seeds of Massive Galaxies"

abstract

Sadegh Khochfar

University of Edinburgh

host: Shardha Jogee

Mar. 4

"Our Galactic Supermassive Black Hole Sgr A*: The Ideal Testbed for Theories of Accretion and Black Hole Life Cycles"

abstract

Sera Markoff

University of Amsterdam

host: Pawan Kumar

Mar. 11

Spring Break: 10-14 March: No talk scheduled.


Mar. 18

"Rest-frame Optical Spectra: A Window into Galaxy Formation at z~2"

abstract

Alice E. Shapley

University of California, Los Angeles

host: Steve Finkelstein

Mar. 25

Tinsley Visiting Scholar, Stars Group

"Hunting the First Generations of Stars and Galaxies"

The new Australian SkyMapper 1.3m telescope is carrying out a photometric survey of the entire Southern Sky. By using a ugriz filter plus an additionally narrow filter placed at the Ca K line at 3933A, stellar parameters can be obtained for all stars observed. This allows for an efficient selection of a variety of stellar types, including metal-poor stars. Recent efforts to search for the most metal-poor stars have indeed delivered a new record holder for the most iron-poor star: no iron lines were detected in the high-resolution follow-up Magellan spectrum and only an upper limit of [Fe/H]<-7.1 could be determined. Contrary to its iron deficiency, the star has a significant amount of carbon. This abundance pattern can be explained with the star being a second-generation star in the universe which formed from a gas cloud enriched by only one Pop III first star. What was the environment in which these early stellar generations formed? A spectroscopic study of the faintest dwarf galaxy Segue 1 has shed light on this question. Given the chemical abundance patterns of some of its only few stars (with metallicities ranging from -4 < [Fe/H] < -1) this suggests that this tiny galaxy may be a surviving first galaxy from the early universe. This suggestion is in line with recent age measurements for a similar ultra-faint dwarf which showed these galaxies to be single-age stellar systems that are about as old as the universe itself.

close

Anna Frebel

Massachusetts Institute of Technology

host: Fritz Benedict

Apr. 1

"Shadows of Their Future Selves: Accretion and Obscuration in Young Stellar Objects"

abstract

Kevin R. Covey

Lowell Observatory

host: Adam Kraus

Apr. 8

"Head in the Clouds: Decoding the Spectral Features Produced by Brown Dwarf and Exoplanent Atmospheres"

abstract

Kelle Cruz

Hunter College/AMNH

host: Adam Kraus

Apr. 15
1 PM

PhD Defense Presentation

"Measuring Dark Matter Profiles Non-Parametrically in Dwarf Spheroidal Galaxies"

abstract

John Jardel

University of Texas at Austin

Apr. 15

"Hunting the First Galaxies with Gravitational Lensing"

abstract

Dan A. Coe

Space Telescope Science Institute (STScI)

host: Steve Finkelstein

Apr. 22

Tinsley Visiting Professor

"Adventures in Cosmic Star Formation"

abstract

Mark E. Dickinson

National Optical Astronomy Observatory (NOAO)

host: TBA

Apr. 23
Wed
3 PM

Tinsley Visiting Scholar, Exgal Group

"MaNGA: Mapping Nearby Galaxies at Apache Point Observatory An IFU Survey of 10,000 Galaxies"

abstract

Kevin A. Bundy

University of Tokyo, IPMU

host: Niv Drory

Apr. 25
Fri
2 PM

Tinsley Visiting Scholar, Planets Group

"Extrasolar Planets with Small Telescopes"

abstract

Gaspar Bakos

Princeton University

host: Mike Endl

Apr. 29

No talk scheduled.

abstract

May 6

"Stark Broadening of Hydrogen Spectral Lines in Plasmas: Advanced Theories, Benchmark Experiments, Astrophysical Applications"

abstract

Eugene Oks

Auburn University

host: Don Winget

Visitors to the Department of Astronomy can find detailed information and maps on our Visiting Austin Page.

Please report omissions/corrections to: G. Orris at argus@astro.as.utexas.edu.

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