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Science Colloquia Webcasts
Wednesday Mar 14, 2018
2018 Spring Science Colloquia
Andy Howell (Las Cumbres Observatory)
We were one of six groups to first detect and characterize the kilonova associated with the gravitational wave signal GW170817. Using our global network of telescopes at Las Cumbres Observatory we were then able to observe the supernova approximately ...
Monday Mar 12, 2018
John Bahcall Lecture Series
Garth Illingworth (University of California, Santa Cruz)
Hubble has revolutionized the discovery and study of the earliest galaxies through its exploration of the universe in the first billion years after the Big Bang. I will discuss what we have learned about galaxies during that epoch at redshift z>6 fr ...
Friday Mar 2, 2018
STScI Astrobiology Lecture Series
Tanja Bosak (MIT)
How to recognize signs of life in past sediments from Earth or other planets? Sedimentary record from the first 80% of Earth’s history preserves signatures of microbial life, but these biosignatures can often be difficult to recognize or interpret. ...
Wednesday Feb 28, 2018
2018 Spring Science Colloquia
Kevin Schlaufman  (JHU)
No description found.
Wednesday Feb 21, 2018
2018 Spring Science Colloquia
Vicky Kalogera (Northwestern University)
In the past two years the gravitational-wave detections enabled by the LIGO detectors have launched a new field in observational astronomy allowing us to study compact object mergers involving pairs of black holes and neutron stars. I will discuss w ...
Wednesday Feb 14, 2018
2018 Spring Science Colloquia
Suzanne Staggs (Princeton University)
Famously, the rich angular power spectrum of the intensity of the cosmic microwave background (CMB) reveals the state of the universe a mere 10^{13} s after the big bang. In its fine-angular scale details, the CMB also encodes details of the CMB’s in ...
Wednesday Feb 7, 2018
2018 Spring Science Colloquia
Jennifer Johnson (Ohio State University)
Reliable stellar ages hold the key to numerous questions of galaxy and stellar system formation. However, they have been frustratingly hard to measure for field stars. While Gaia will improve the situation markedly for nearby turnoff stars, determina ...
Friday Feb 2, 2018
STScI Astrobiology Lecture Series
Alfonso F. Davila (NASA Ames Research Center, Exobiology Branch)
Are we alone in the Universe? The search for life beyond Earth is the most compelling scientific question of our time; a positive detection would be one of the most profound discoveries ever made by humanity. Chemical evidence of habitable conditions ...
Wednesday Jan 31, 2018
2018 Cold Science Colloquia
Lea Hagen (STScI)
No description found.
2018 Cold Science Colloquia
Armin Rest (STScI)
No description found.
Wednesday Jan 24, 2018
2018 Cold Science Colloquia
Kirsten Hall (JHU)
No description found.
2018 Cold Science Colloquia
Giovanni Bruno (STScI)
No description found.
Wednesday Jan 17, 2018
2018 Cold Science Colloquia
Nick Indriolo (STScI)
Nick Indriolo (STScI) – The Cosmic-ray Flux in z~2 Galaxies Inferred from Molecular Abundances Interstellar gas-phase chemistry is primarily driven by fast ion-molecule reactions, and cosmic rays are the dominant mechanism for ionizing hydrogen in s ...
2018 Cold Science Colloquia
Jennifer Lotz (STScI/JHU)
Jennifer Lotz (STScI) – Quantifying the Evolution of Galaxy Distributions Abstract: We present a powerful new empirical methodology for tracking the evolution of galaxy distributions over cosmic time. With the PanSTARRS Optical Galaxy Survey (PO ...
Wednesday Dec 13, 2017
2017 Fall Science Colloquia
Gilles Fontaine (University of Montreal)
A few years ago, Charpinet, Fontaine, & Brassard (2009, Nature, 461, 501) developed a new approach to test for solid body rotation (and deviations thereof) in pulsating stars. The method was successfully applied to the prototype of the GW Vir class o ...
Wednesday Dec 6, 2017
2017 Fall Science Colloquia
Mark Vogelsberger (Massachusetts Institute of Technology)
In my talk I will describe recent efforts to model the large-scale distribution of galaxies with cosmological hydrodynamics simulations. I will focus on the Illustris simulation, and our new simulation campaign, the IllustrisTNG project. After demon ...
Friday Dec 1, 2017
STScI Astrobiology Lecture Series
Kevin Peter Hand (NASA/Jet Propulsion Lab/Caltech)
Where is the best place to find living life beyond Earth? It may be that the small, ice-covered moons of Jupiter and Saturn harbor some of the most habitable real estate in our Solar System. Life loves liquid water and these moons have lots of it! Dr ...
Wednesday Nov 29, 2017
2017 Fall Science Colloquia
Victoria Kaspi (McGill University)
Fast Radio Bursts (FRBs) are a newly discovered astrophysical phenomenon consisting of short (few ms) bursts of radio waves. FRBs occur roughly 1000 times per sky per day. From their dispersion measures, these events are clearly extragalactic and p ...
Wednesday Nov 8, 2017
2017 Fall Science Colloquia
Mariska Kriek (University of California-Berkeley)
In past years, large and deep photometric and spectroscopic surveys have significantly advanced our understanding of galaxy growth, from the most active time in the universe (z~2) to the present day. In particular, the evolution in stellar mass, star ...
Wednesday Nov 1, 2017
2017 Fall Science Colloquia
Blakesley Burkhart (Harvard-Smithsonian Center for Astrophysics)
Our current view of the interstellar medium (ISM) is as a multiphase environment where turbulence affects many key processes. These include star formation, cosmic ray acceleration, and the evolution of structure in the diffuse ISM. It is therefore es ...
Wednesday Oct 25, 2017
2017 Fall Science Colloquia
Ian Roederer (University of Michigan)
: NASA's Cosmic Origins program aims to address the question, "How did we get here?" My work addresses this question through three broad themes: the nature of the first stars, the formation and evolution of the Milky Way and Local Group, and the ori ...
Wednesday Oct 11, 2017
2017 Fall Science Colloquia
Caitlin Casey (University of Texas)
Although rare in the nearby Universe, galaxies with extraordinary star-formation rates (100-1000x the Milky Way at >100 Msun/year) represent the typical massive galaxy in the early Universe ~10 billion years ago. These galaxies’ high star-formation ...
Friday Oct 6, 2017
STScI Astrobiology Lecture Series
David Grinspoon (Planetary Science Institute)
Informed by comparative planetology and a survey of the major episodes in Earth history, this lecture will offer taxonomy of planetary catastrophes meant to illuminate the unusual nature of the “Anthropocene”, the current era of human-driven planetar ...
Wednesday Oct 4, 2017
2017 Fall Science Colloquia
Megan Donahue  (Michigan State University )
One of the biggest challenges to understanding how galaxies work is decoding the role of the central supermassive black hole. Without feedback from the black hole (“AGN feedback”), galaxy evolution models fail to produce realistic massive galaxies an ...
Wednesday Sep 27, 2017
2017 Fall Science Colloquia
Bruce Draine (Princeton University)
The anomalous microwave emission (AME) is emission in the 20-60 GHz range that is correlated with interstellar dust. Discovered in 1996 by the COBE DMR experiment, the AME is a "foreground" that needs to be removed to study the CMB, but it is also a ...
Wednesday Sep 20, 2017
2017 Fall Science Colloquia
Raffaella Margutti (Northwestern University)
Observations are drawing a complex picture of the latest stages of massive stars evolution and their explosions. In this seminar I concentrate on two among the least understood aspects of stellar evolution, adopting an observational perspective: How ...