Daily Image
31-08-2023
A study of the local environment of FRB 20181030A (R4) using VLBI
| Submitter: | Lasse Thiellesen |
| Description: | Fast radio bursts (FRBs) are highly energetic radio bursts, which originate at extragalactic distances and occur at milli-second durations. We are interested in studying these transients in the time and image domain to shed light upon their origins. Furthermore, the potential for FRBs to be used for probing the universe at cosmic scales is promising. Currently, two repeating FRBs, R1 and R1 twin, have been associated with compact and luminous continuum radio emissions, dubbed Persistent Radio Sources (PRSs). It is an open question whether other repeaters or non-repeaters are associated with such sources. Much effort has been put into studying the local environment of other FRBs, and to answer this question. In this project, we aim to study the local environment of the relatively new repeating FRB 20181030A (R4). This FRB is hosted in a massive spiral galaxy at a distance of 20Mpc. The current 3-sigma upper limit on the luminosity of the persistent radio source (source size < 0.3 kpc at 20 Mpc) is 2e26 erg/s/Hz which is about 1500x less than the luminosity of PRS associated with R1 and R1-twin. We conducted radio follow-up of the field using PRECISE (Pinpointing Repeating ChIme Sources with EVN dishes) observations with the European VLBI Network (EVN). No FRBs were detected in these datasets. After calibrating the data in CASA, we also imaged the FRB field. The analysis is still ongoing. |
| Copyright: | Paul Boven for EVN image and Bhardwaj+21 for the FRB localisation image. |
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