Milliarcsecond localization of the hyperactive repeating FRB 20220912A
Artikel i vetenskaplig tidskrift, 2024

We present very long-baseline interferometry (VLBI) observations of the hyperactive repeating FRB 20220912A using the European VLBI Network (EVN) outside of regular observing sessions (EVN-Lite). We detected 150 bursts from FRB 20220912A over two observing epochs in 2022 October. Combining the burst data allows us to localize FRB 20220912A to a precision of a few milliarcseconds, corresponding to a transverse scale of less than 10 pc at the distance of the source. This precise localization shows that FRB 20220912A lies closer to the centre of its host galaxy than previously found, although still significantly offset from the host galaxy's nucleus. On arcsecond scales, FRB 20220912A is coincident with a persistent continuum radio source known from archival observations; however, we find no compact persistent emission on milliarcsecond scales. The 5σ upper limit on the presence of such a compact persistent radio source is 120 μJy, corresponding to a luminosity limit of (D/362.4 Mpc)erg s-1 Hz-1. The persistent radio emission is thus likely to be from star formation in the host galaxy. This is in contrast to some other active FRBs, such as FRB 20121102A and FRB 20190520B.

techniques: high angular resolution

fast radio bursts

radio continuum: transients

Författare

Dante M. Hewitt

Anton Pannekoek Institute for Astronomy

Shivani Bhandari

Netherlands Institute for Radio Astronomy (ASTRON)

Joint Institute for VLBI in Europe (JIVE)

Anton Pannekoek Institute for Astronomy

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

B. Marcote

Joint Institute for VLBI in Europe (JIVE)

J. W. T. Hessels

Netherlands Institute for Radio Astronomy (ASTRON)

Anton Pannekoek Institute for Astronomy

K. Nimmo

Massachusetts Institute of Technology (MIT)

Franz Kirsten

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

U. Bach

Max-Planck-Gesellschaft

V. Bezrukovs

Ventspils Augstskola

Mohit Bhardwaj

Carnegie Mellon University (CMU)

R. Blaauw

Netherlands Institute for Radio Astronomy (ASTRON)

Justin D. Bray

University of Manchester

S. Buttaccio

Istituto di Radioastronomia

A. Corongiu

Istituto nazionale di astrofisica (INAF)

M. P. Gawroński

Uniwersytet Mikolaja Kopernika

M. Giroletti

Istituto di Radioastronomia

A. Keimpema

Joint Institute for VLBI in Europe (JIVE)

G. Maccaferri

Istituto di Radioastronomia

Z. Paragi

Joint Institute for VLBI in Europe (JIVE)

M. Trudu

Istituto nazionale di astrofisica (INAF)

M. P. Snelders

Netherlands Institute for Radio Astronomy (ASTRON)

Anton Pannekoek Institute for Astronomy

T. Venturi

Istituto di Radioastronomia

N. Wang

Xinjiang Astronomical Observatory

David Williams-Baldwin

University of Manchester

Nicholas H. Wrigley

University of Manchester

Jun Yang

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

J. P. Yuan

Xinjiang Astronomical Observatory

Monthly Notices of the Royal Astronomical Society

00358711 (ISSN) 13652966 (eISSN)

Vol. 529 2 1814-1826

Ämneskategorier

Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi

DOI

10.1093/mnras/stae632

Mer information

Senast uppdaterat

2024-03-27