FAST RADIO BURSTS: FROM A HANDFUL TO HUNDREDS WITH CHIME/FRB
KIYOSHI MASUI, ALEX JOSEPHY, AND MOHIT BHARDWAJ FOR THE CHIME/FRB COLLABORATION
AAS PRESS BRIEFING JUNE 9, 2021
Correspondance to: [email protected] (857) 207-6121 FAST RADIO BURSTS
Bright, brief (millisecond) flashes of radio light coming from other galaxies
Likely neutron star/magnetar origin but otherwise poorly understood, limited by small numbers
Distortion of signals (dispersion) carries record of structure travelled through
CHIME/FRB COLLABORATION ARTWORK: ESA CANADIAN HYDROGEN INTENSITY MAPPING EXPERIMENT
FAST RADIO BURST INSTRUMENT (CHIME/FRB)
CHIME/FRB COLLABORATION chime-experiment.ca CHIME/FRB CATALOG MAP OF EVERY KNOWN FRB UP TO JULY 2018
CHIME/FRB COLLABORATION CHIME/FRB CATALOG MAP OF EVERY KNOWN FRB UP TO JULY 2019
CHIME/FRB COLLABORATION CATALOG CONTENTS
535 FRBs observed between July 2018 and July 2019
Includes 61 bursts from 18 repeating sources
Properties of each burst: time, sky location, brightness, duration, dispersion, etc.
See CHIME/FRB Collaboration 2021
CHIME/FRB COLLABORATION A NEW PHASE OF FRB SCIENCE
First large sample of FRBs
Enables precision studies of the FRB Population
Opportunity to study large- scale structure of the Universe
CHIME/FRB COLLABORATION POPULATION MODELLING
Simulating fake bursts allows us to understand our observational biases
Measure brightness distribution and rate: ~800 bright FRBs per day
CHIME/FRB COLLABORATION SKY DISTRIBUTION
Must consider sensitivity, telescope response, and galactic foreground.
After correcting for these effects, we find strong evidence for uniform distribution.
See: Josephy et al. 2021
CHIME/FRB COLLABORATION LARGE SCALE STRUCTURE
Find FRBs to be correlated with galaxies, for a wide redshift range
Ushering in new era of FRB cosmology
See: Rafiei-Ravandi et al. 2021
CREDIT: MILLENNIUM SIMULATION CHIME/FRB COLLABORATION BURST FINGERPRINTS
See: Pleunis et al. 2021
Compared to one-offs, repeaters tend to have larger widths and smaller bandwidths.
CHIME/FRB COLLABORATION FRB20181030A
A repeating FRB in the CHIME/FRB Catalog
Burst properties suggest local universe origin
FRB localized to a sky area ~140x smaller than the Moon on the sky
CHIME/FRB COLLABORATION FRB20181030A: HOST ASSOCIATION
NGC3252: bright, star forming, spiral galaxy in Draco constellation at a distance of 65 million light- years.
Probability of chance alignment - <0.25%.
One of the closest FRBs discovered to date.
CHIME/FRB COLLABORATION FRB20181030A: IMPLICATIONS
VERY PROMISING TO UNCOVER THE ORIGIN OF FRBS.
SGR1935+2154 M81 NGC 3252 FRB20180916A 5X 7.5X
12 million light-years 65 million light-years 486 million light-years
CHIME/FRB COLLABORATION CHIME/FRB CATALOG PUBLIC RELEASE
Hundreds of new bursts usher new phase of big-data FRB science
Catalog and data publicly available at https://www.chime-frb.ca
Stay tuned for more analysis results, from us and the community
Correspondance to: Kiyoshi Masui [email protected] (857) 207-6121