Astronomy Colloquia

THANKSGIVING HOLIDAY - NO ASTRONOMY COLLOQUIUM

Event Date and Time: 
Mon, 2017-10-09 15:30 - 16:45
Location: 
Hennings 318

To be announced

Speaker: 
Hannah Jang-Condell (University of Wyoming)
Event Date and Time: 
Mon, 2017-10-16 15:30 - 16:45
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

To be announced

Studying The Earliest Phase of Massive Star and Cluster Formation: Properties of Massive Starless Clump Candidates in the Milky Way

Speaker: 
Yancy Shirley (Steward Observatory, University of Arizona)
Event Date and Time: 
Mon, 2017-10-02 15:00 - 16:00
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

Recent surveys of the dust continuum emission in the Milky Way Galaxy have revealed tens of thousands of cold, dense clumps with enough mass to form clusters of stars (some potentially massive stars) but no current evidence for star formation. These massive starless clump candidates represent the earliest phase of cluster formation. The typical starless clump candidate is ~1 pc in size, cold (Tk ~ 13 K), and with a mass of ~250 Msun.

The future of mapping dark matter structures with strong gravitational lensing, new surveys, and machine learning

Speaker: 
Yashar Hezaveh (Stanford)
Event Date and Time: 
Mon, 2017-09-25 15:00 - 16:00
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

Strong gravitational lensing provides a unique opportunity to investigate many subjects, including the distribution of dark matter in lensing galaxies, the properties of distant galaxies by magnifying their images, and the expansion rate of the universe. Today, however, there are only a few hundred strong lenses known and the study of these systems has been often limited to small samples, due to the challenging nature of lens modeling analysis. This is about to change.

Is anyone out there? SETI@home and the Breakthrough Listen Project

Speaker: 
Dan Werthimer (Berkeley)
Event Date and Time: 
Mon, 2017-09-18 15:00 - 16:00
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews and Mark Halpern
Intended Audience: 
Graduate

What is the possibility of other intelligent life in the universe? Can we detect radio, infrared, or visible light signals from alien civilizations? Current and future projects searching for such signals, including the new $100-million Breakthrough Prize Foundation Listen project, may provide an answer. Dan Werthimer will describe the plans for future searches and show how new technologies are revolutionizing the search for extra-terrestrial intelligence (SETI).

Circumgalactic Matter Matters

Speaker: 
Jessica Werk (University of Washington)
Event Date and Time: 
Mon, 2017-09-11 15:30 - 16:45
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
The circumgalactic medium (CGM; non-ISM gas within a galaxy virial radius) regulates the gas flows that shape the assembly and evolution of galaxies. Owing to vastly improved capabilities in space-based UV spectroscopy with the installation of HST/COS, observations and simulations of the CGM have emerged as the new frontier of galaxy evolution studies. In the last decade, we have learned that the CGM of Milky Way mass galaxies likely contains enough material to harbor most of the metals lost in galaxy winds and to sustain star-formation for billions of years.

Asteroseismology: A new Keplerian revolution

Speaker: 
Professor Donald Kurtz (Jeremiah Horrocks Institute, University of Central Lancashire)
Event Date and Time: 
Thu, 2017-08-10 12:30 - 13:45
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
In 1926 in the opening paragraph of his now-classic book, The Internal Constitution of the Stars, Sir Arthur Eddington lamented, “What appliance can pierce through the outer layers of a star and test the conditions within?” While he considered theory to be the proper answer to that question, there is now an observational answer: asteroseismology. We are in a time of a significant advance in our understanding of stellar astrophysics with data from the Kepler Mission. From its rich 4-year data set nearly 5000 exoplanet candidates have been discovered - the majority of all known.

Corralling a distant unseen planet with extreme resonant Kuiper Belt Objects

Speaker: 
Renu Malhotra (Lunar and Planetary Lab, University of Arizona)
Event Date and Time: 
Mon, 2017-04-24 15:30 - 16:45
Location: 
Hennings 318
Local Contact: 
Brett Gladman and Jaymie Matthews
Intended Audience: 
Graduate
Several recent studies have appealed to the clustering of the angular orbital elements of very distant, extreme Kuiper Belt Objects (eKBOs) to argue for the existence of a large planet in the distant Solar System. I will review these arguments, and also describe other properties of eKBOs that may support the existence of such an unseen planet. We observe that several eKBOs have orbital periods close to integer ratios with each other. These are not dynamically significant unless the eKBOs are in mean motion resonances (MMRs) with a massive planet.

Scaling laws for dark matter halos of late-type and dwarf spheroidal galaxies

Speaker: 
John Kormendy (University of Texas at Austin)
Event Date and Time: 
Thu, 2017-03-23 12:30 - 13:45
Location: 
Hennings 301 - NOTE DIFFERENT LOCATION
Local Contact: 
Jaymie Matthews and Philip Stamp
Intended Audience: 
Graduate
Dark matter (DM) halos of Sc-Im and dwarf spheroidal (dSph) galaxies satisfy scaling laws: halos in lower-luminosity galaxies have smaller core radii, higher central densities, and smaller velocity dispersions. These results are based on maximum-disk rotation curve decompositions for giant galaxies and Jeans equation analysis for dwarfs. (1) We show that spiral, Im, and Sph galaxies with absolute magnitudes M_V > -18 form a sequence of decreasing baryon-to-DM surface density with decreasing luminosity.

High redshift starburst galaxies revealed by the South Pole Telescope, ALMA, and gravitational lensing

Speaker: 
Scott Chapman (Dalhousie University)
Event Date and Time: 
Mon, 2017-02-27 15:30 - 16:45
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
Recent facilities such as the South Pole Telescope (SPT), the Herschel Space Observatory, and the Atacama Large Millimeter Array (ALMA) have opened a window to the millimeter (mm) sky and revealed a unique and unprecedented view of the Universe. In a 2500-square-degree cosmological survey, SPT has systematically identified a large number (200) of high-redshift strongly gravitationally lensed starburst galaxies.
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