TY - UNPB
T1 - Frb 20210405i
T2 - a nearby Fast Radio Burst localised to sub-arcsecond precision with MeerKAT
AU - Driessen, Laura Nicole
AU - Barr, Ewan
AU - Buckley, David
AU - Caleb, Manisha
AU - Chen, Hao
AU - Chen, Weiwei
AU - Gromadzki, Mariusz
AU - Jankowski, Fabian
AU - Kraan-Korteweg, Renee
AU - Kramer, Michael
AU - Palmerio, Jesse
AU - Rajwade, Kaustubh
AU - Stappers, Ben
AU - Tremou, Evangelia
AU - Vergani, Susanna
AU - Woudt, Patrick
AU - Bezuidenhout, Mechiel Christiaan
AU - Malenta, Mateusz
AU - Morello, Vincent
AU - Sanidas, Sotiris
AU - Surnis, Mayuresh
AU - Fender, Rob
N1 - 15 pages, 4 tables, 10 figures. Accepted to MNRAS
PY - 2023/2/20
Y1 - 2023/2/20
N2 - We present the first sub-arcsecond localised Fast Radio Burst (FRB) detected using MeerKAT. FRB 20210405I was detected in the incoherent beam using the MeerTRAP pipeline on 2021 April 05 with a signal to noise ratio of 140.8 and a dispersion measure of 565.17 pc cm$^{-3}$. It was detected while MeerTRAP was observing commensally with the ThunderKAT large survey project, and was sufficiently bright that we could use the ThunderKAT 8s images to localise the FRB. Two different models of the dispersion measure in the Milky Way and halo suggest that the source is either right at the edge of the Galaxy, or outside. This highlights the uncertainty in the Milky Way dispersion measure models, particularly in the Galactic Plane, and the uncertainty of Milky Way halo models. Further investigation and modelling of these uncertainties will be facilitated by future detections and localisations of nearby FRBs. We use the combined localisation, dispersion measure, scattering, specific luminosity and chance coincidence probability information to find that the origin is most likely extra-galactic and identify the likely host galaxy of the FRB: 2MASS J1701249$-$4932475. Using SALT spectroscopy and archival observations of the field, we find that the host is a disk/spiral galaxy at a redshift of $z=0.066$.
AB - We present the first sub-arcsecond localised Fast Radio Burst (FRB) detected using MeerKAT. FRB 20210405I was detected in the incoherent beam using the MeerTRAP pipeline on 2021 April 05 with a signal to noise ratio of 140.8 and a dispersion measure of 565.17 pc cm$^{-3}$. It was detected while MeerTRAP was observing commensally with the ThunderKAT large survey project, and was sufficiently bright that we could use the ThunderKAT 8s images to localise the FRB. Two different models of the dispersion measure in the Milky Way and halo suggest that the source is either right at the edge of the Galaxy, or outside. This highlights the uncertainty in the Milky Way dispersion measure models, particularly in the Galactic Plane, and the uncertainty of Milky Way halo models. Further investigation and modelling of these uncertainties will be facilitated by future detections and localisations of nearby FRBs. We use the combined localisation, dispersion measure, scattering, specific luminosity and chance coincidence probability information to find that the origin is most likely extra-galactic and identify the likely host galaxy of the FRB: 2MASS J1701249$-$4932475. Using SALT spectroscopy and archival observations of the field, we find that the host is a disk/spiral galaxy at a redshift of $z=0.066$.
KW - astro-ph.HE
M3 - Preprint
BT - Frb 20210405i
ER -