Past Colloquia
December 13th Colloquium Canceled
Cody Hall
John Beacom (Ohio State University)
December 13, 2017
14:00 - 15:00
TBA
X-ray-Driven Multiwavelength and Multimessenger Discovery
Cody Hall, AB 107
Daryl Haggard (McGill University)
December 06, 2017
14:00 - 15:00
I will discuss the importance of time-resolved X-ray observations in studies of strong gravity near black holes and neutron stars, and also in the context of multiwavelength and multimessenger astrophysics. I’ll draw on two exciting examples: Sgr A* and GW170817. X-ray and multiwavelength monitoring of…
Data-driven models of the Milky Way in the Gaia era
Cody Hall, AB 107
Boris Leistedt (NYU)
November 29, 2017
14:00 - 15:00
The Gaia satellite will soon deliver magnitudes, parallaxes, and proper motions of billions of stars, offering an unprecedented detailed view of the structure and dynamics of our Galaxy. Correctly exploiting Gaia is challenging due to the colossal amount of data, the complicated selection effects and…
Probing the Origins of Fast Radio Bursts
Cody Hall, AB 107
Shriharsh Tendulkar (McGill University)
November 22, 2017
14:00 - 15:00
Fast Radio Bursts (FRBs) are by far the most frequent observable astrophysical transients in the sky, yet in the past decade, we have only observed ~30 events, one of which is seen to repeat. With this small heterogenous sample of FRBs, it is challenging to…
The Wind in the Machine: Using Machine Learning to Probe Quasar Outflows
Cody Hall, AB 107
Sarah Gallagher (Western University)
November 15, 2017
14:00 - 15:00
Every massive galaxy hosts a supermassive black hole that grew as a luminous quasar through active accretion when the universe was a fraction of its present age. Quasar activity can therefore be described as an “adolescent” phase of galaxy evolution: inevitable, difficult, and (perhaps) transformative….
Cosmology with Supernovae… and Kilonovae!
Cody Hall, AB 107
Dan Scolnic (Kavli Institute)
October 25, 2017
14:00 - 15:00
In this talk, I will present new analyses of Type Ia Supernovae that mark the most precise measurement of dark energy to date. I will go over how this analysis ties together with the analysis of the local value Hubble constant, for which tension persists…
Resolving scattering disks with ground-space VLBI
Cody Hall, AB 107
Vladimir Soglasnov (Lebedev Physical Institute)
October 18, 2017
14:00 - 15:00
Ground-Space VLBI observations of pulsars with baselines up to ~20 Earth diameters show a surprising view of visibility (delay-fringe rate plot, or delay-Doppler in “secondary spectra”). At low & medium baselines, besides the main peak in the origin it contains a number of needle-like spikes…
Finding Fast Radio Bursts with interferometers
Cody Hall, AB 107
Stefan Osłowski (Swinburne Institute of Technology)
October 11, 2017
14:00 - 15:00
While majority of the enigmatic Fast Radio Bursts have been detected with the single-dish Parkes Observatory radio telescope, new instruments are entering the search.Much progress has been made with interferometric discoveries of FRBs, with the UTMOST project leading the way. On the other hand, the…
The All-Sky Automated Survey for Supernovae (ASAS-SN)
Cody Hall, AB 107
Christopher Kochanek (Ohio State University)
October 04, 2017
14:00 - 15:00
The goal of ASAS-SN is to monitor the entire visible sky on a nightly basis for bright transients. ASAS-SN will reach this goal by the end of 2017. In the interim, ASAS-SN already dominates the discovery of bright supernovae (
Life Beyond Earth: Are Any Habitable Worlds Actually Inhabited?
MP 137, 60 St. George Street
Jill Tarter (SETI Institute)
September 28, 2017
15:00 - 16:00
Are we alone? Humans have been asking this question throughout history. We want to know where we came from, how we fit into the cosmos, and where we are going. We want to know whether there is life beyond the Earth and whether any of…