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A Catalog of Local Universe FRBs Discovered by the CHIME/FRB Collaboration

Presentation #329.01 in the session Neutron Stars.

Published onJul 01, 2023
A Catalog of Local Universe FRBs Discovered by the CHIME/FRB Collaboration

FRBs are a fascinating new frontier in astrophysics. These millisecond radio transients have the potential to become a powerful new probe for identifying the distribution of ionized baryons in the Cosmic Web. Nevertheless, despite the fact that research on FRBs has advanced at an extraordinary rate since the first FRB was discovered in 2007, the nature of FRBs continues to be a subject of intense debate due in part to the small number of localized FRBs. Multi-wavelength follow-up studies of FRBs are one of the most promising ways to determine their origins. Due to the limited sensitivity of high energy telescopes, however, such studies can only be performed on nearby FRBs (≤ 100 Mpc). Therefore, the local Universe FRBs are the best candidates for constraining their engines.

The Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) Project recently presented a catalog of 536 FRBs detected in the frequency range of 400 and 800 MHz between July 25, 2018, and July 1, 2019. In this talk, I will discuss the host association of six FRBs first reported in the catalog with an extragalactic dispersion measure (DM) < 100 pc cm-3. We localized these FRBs to the sky region of effective radius ≤ 2 arcmin made possible using the CHIME/FRB baseband localization pipeline (Michilli+2020). These FRBs are localized to a diverse population of galaxies between z = 0.0035 and 07. In addition, because these local Universe FRBs are detected in a single survey of fixed duration (= 1 year) with uniform selection effects, we have constrained several crucial global properties of FRBs, such as their energy function, host demography, and repetition rate. I will discuss these findings in my talk.

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