Localizations and Lenses: Looking towards Cosmology with CHIME/FRB

Event Date:
2022-03-28T15:00:00
2022-03-28T16:00:00
Event Location:
Connect via zoom
Speaker:
Calvin Leung (MIT)
URL:
Zoom link
Related Upcoming Events:
Astronomy Colloquia
Intended Audience:
Undergraduate
Local Contact:

Douglas Scott

Event Information:

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has discovered thousands of fast radio bursts (FRBs). The extremely high all-sky rate of FRBs implies that they have the potential to become powerful cosmological probes. Unlocking this potential requires localizing a large sample of FRBs to their host galaxies. Until now, precise localization within the host galaxy has only been accomplished in follow-up observations of repeating sources. Here, we demonstrate the localization of FRB 20210603A using very long baseline interferometry (VLBI) at its time of first detection. This is an important milestone towards realizing CHIME/FRB Outriggers: a widefield, blind VLBI survey dedicated to localizing a large sample of FRBs. Finally, I will discuss a novel time-domain search for gravitationally-lensed FRBs, as a first application of FRBs to cosmological measurements. Our results imply that the cosmological dark matter at redshift z~0.1 cannot be composed exclusively of ~10^-3 solar mass compact objects.

Add to Calendar 2022-03-28T15:00:00 2022-03-28T16:00:00 Localizations and Lenses: Looking towards Cosmology with CHIME/FRB Event Information: The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has discovered thousands of fast radio bursts (FRBs). The extremely high all-sky rate of FRBs implies that they have the potential to become powerful cosmological probes. Unlocking this potential requires localizing a large sample of FRBs to their host galaxies. Until now, precise localization within the host galaxy has only been accomplished in follow-up observations of repeating sources. Here, we demonstrate the localization of FRB 20210603A using very long baseline interferometry (VLBI) at its time of first detection. This is an important milestone towards realizing CHIME/FRB Outriggers: a widefield, blind VLBI survey dedicated to localizing a large sample of FRBs. Finally, I will discuss a novel time-domain search for gravitationally-lensed FRBs, as a first application of FRBs to cosmological measurements. Our results imply that the cosmological dark matter at redshift z~0.1 cannot be composed exclusively of ~10^-3 solar mass compact objects. Event Location: Connect via zoom