Sean Terry, Minjung Park, Alice Curtin

Talk 1: Sean Terry, 2:30pm - 3:00pm
A precursor survey of the Roman Galactic Bulge Time Domain fields
I will present a recently approved program to conduct a large coordinated-parallel Hubble Space Telescope (HST) imaging survey of the upcoming Roman Galactic Bulge Time Domain Survey (RGBTDS) fields. Precursor imaging of this area with HST several years before the start of the Roman Galactic Exoplanet Survey (RGES) will greatly strengthen Roman’s ability to characterize a majority of detected exoplanet systems, as well as provide a rich and wide-field archive for use as a Legacy dataset toward the Galactic bulge for the broader community.

Talk 2: Minjung Park, 3:00pm -  3:30pm
Rapid quenching of galaxies at cosmic noon
Massive quiescent galaxies in the young Universe are expected to be quenched rapidly, but it is unclear whether they all experience starbursts before quenching and what physical mechanism drives rapid quenching. In the first half of my talk, I will present our recent study on the quenching histories and mechanisms of massive quiescent galaxies at z~2 from the JWST Cycle 1 program, the Blue Jay survey. We find that ~70% of massive quiescent galaxies at z~2 are rapidly quenched. The neutral gas outflows and ionized gas emissions found in many of the recently quenched galaxies suggest that ejective AGN feedback drives multiphase gas outflows, leading to recent rapid quenching. In the second half of the talk, I will present some results from our recent paper on the new self-consistent alpha-enhanced stellar population models, which will be essential in deriving the physical properties of high-redshift galaxies where alpha-enhancement is expected to be common.

Talk 3: Alice Curtin,  3:30pm - 4:00pm
Uncovering the origins of FRBs
Fast Radio Bursts (FRBs) are a class of highly luminous, extragalactic radio transients that occur on nano-to-millisecond timescales. Since its commissioning in 2018, the Canadian Hydrogen Intensity Mapping Experiment (CHIME) FRB Project has detected over 4000 FRBs, shedding critical light on both the sources and emission mechanisms responsible for FRBs. In this talk, I will discuss recent efforts with CHIME/FRB to answer two critical questions about FRBs: 1. What can we learn about FRB progenitors by studying the time and frequency structure of FRBs? And 2. Might FRBs be related to and/or associated with gamma-ray bursts? To answer these questions, I will first discuss the nature of repeating FRBs, and ongoing efforts to study their features at high time resolution. I will then discuss a search for coincident FRBs and gamma-ray bursts, and present some of the first constraints on simultaneous radio emission from short gamma-ray bursts.