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Research
Colloquium Series

All talks are held on Wednesdays in the STScI John N. Bahcall Auditorium at 3:30 p.m. preceded by tea at 3:15 p.m.

Please direct questions or comments to the colloquium committee. The 2016-17 committee members are Brad Whitmore (chair), Gabe Brammer, Andy Fruchter (ex officio), Olivia Jones and Nora Luetzendorf.

STScI presents live and archived webcasting of talks and Colloquium Series.

Date Speaker/Title
Sep. 07 Tim Heckman (Johns Hopkins University)
Title: Feedback from Massive Stars: Implications for the Evolution of Galaxies and the Inter-Galactic Medium
Abstract: I will begin by summarizing why global outflows driven from intensely star-forming galaxies are believed to play a significant role in the evolution of galaxies and the IGM. I will then review the physical mechanisms believed to be responsible for driving these outflows, before giving a “guided tour” of M 82 (the prototypical starburst-driven outflow). I will summarize how the basic properties of outflows are measured, describe how these properties scale with those of the galaxy driving the outflow, and compare these relations to expectations from simple models and with the “sub-grid” prescriptions used in numerical simulations of galaxy evolution. Finally, I will circle back to discuss the implications of these outflows, based on our current understanding.
Host: None
Sep. 14 Alycia Weinberger (Carnegie Institution of Washington)
Title: Circumstellar Disks: Tracing the Formation of Planetary Systems
Abstract: I will show observations of circumstellar disks that elucidate the timescales for planetary formation, the compositions and structures found at various stages of disk evolution, and observations of young stars that clarify their timescales for disk dissipation.
Host: TBS
Sep. 21 Jennifer Lotz (Space Telescope Science Institute)
Title: Galaxy Assembly and Mergers through Cosmic Time
Abstract: TBS
Host: None
Sep. 28 Brad Peterson (Ohio State University/Space Telescope Science Institute)
Title: Exploring the Inner Structure of Active Galactic Nuclei by Reverberation
Abstract: The innermost structure of active galactic nuclei (AGNs) consists of an accretion disk surrounding a supermassive black hole and, on somewhat larger scales, rapidly moving diffuse gas. The ultraviolet through near IR spectrum of AGNs is dominated by thermal continuum emission from the accretion disk and broad emission lines and absorption features from the diffuse gas. The continuum flux from the accretion disk varies with time, and the emission lines also change in brightness, or “reverberate,” in response to these variations, with a delay due to the light-travel time across the line-emitting region. Measurement of the emission-line time delay yields the size of the line-emitting region and by combining this with the emission-line Doppler width, the central black hole mass can be inferred. I will discuss results from recent “reverberation mapping” experiments, including a 179-orbit HST Cycle 21 program, that have been designed to explore the dynamics of the emission-line gas and are yielding a wealth of new and quite surprising information about AGN structure.
Host: TBS
Oct. 05 Charles Steidel (California Institute of Technology)
Title: Reconciling the Massive Stars and Nebular Emission in High Redshift Galaxies
Abstract: TBS
Host: TBS
Oct. 12 (No Colloquium)
Oct. 19 Andrew Fox (Space Telescope Science Institute)
Title: The Gaseous Halo of the Milky Way: A Close-Up View of Galactic Inflow and Outflow
Abstract: TBS
Host: None
Oct. 26 (No Colloquium)
Nov. 02 (No Colloquium)
Nov. 09 Nadine Neumayer (Max Planck Institute for Astronomy)
Title: The Build-up of Galactic Nuclei: How Do Black Holes Get There?
Abstract: TBS
Host: TBS
Nov. 16 Anne Marie Lagrange (Observatoire de Grenoble)
Title: Direct imaging of Exoplanets: Current Status and Prospects
Abstract: TBS
Host: TBS
Nov. 23 (No Colloquium)
Nov. 30 Gurtina Besla (University of Arizona)
Title: The Dynamics of Our Local Group: The Role of Massive Satellites
Abstract: TBS
Host: TBS
Dec. 07 (No Colloquium)
Dec. 14 Beth Willman (Large Synoptic Survey Telescope)
Title: Pre-cursor LSST Science With the Magellanic Analog Dwarf Companions and Stellar Halos Survey
Abstract: TBS
Host: TBS