Milliarcsecond Localization of the Repeating FRB 20201124A
Artikel i vetenskaplig tidskrift, 2022

Very long baseline interferometric (VLBI) localizations of repeating fast radio bursts (FRBs) have demonstrated a diversity of local environments: from nearby star-forming regions to globular clusters. Here we report the VLBI localization of FRB 20201124A using an ad hoc array of dishes that also participate in the European VLBI Network (EVN). In our campaign, we detected 18 bursts from FRB 20201124A at two separate epochs. By combining the visibilities from both epochs, we were able to localize FRB 20201124A with a 1 sigma uncertainty of 2.7 mas. We use the relatively large burst sample to investigate astrometric accuracy and find that for greater than or similar to 20 baselines (greater than or similar to 7 dishes) we can robustly reach milliarcsecond precision even using single-burst data sets. Subarcsecond precision is still possible for single bursts, even when only similar to 6 baselines (four dishes) are available. In such cases, the limited uv coverage for individual bursts results in very high side-lobe levels. Thus, in addition to the peak position from the dirty map, we also explore smoothing the structure in the dirty map by fitting Gaussian functions to the fringe pattern in order to constrain individual burst positions, which we find to be more reliable. Our VLBI work places FRB 20201124A 710 +/- 30 mas (1 sigma uncertainty) from the optical center of the host galaxy, consistent with originating from within the recently discovered extended radio structure associated with star formation in the host galaxy. Future high-resolution optical observations, e.g., with Hubble Space Telescope, can determine the proximity of FRB 20201124A's position to nearby knots of star formation.

Författare

K. Nimmo

Netherlands Institute for Radio Astronomy (ASTRON)

Universiteit Van Amsterdam

D. M. Hewitt

Universiteit Van Amsterdam

J. W. T. Hessels

Netherlands Institute for Radio Astronomy (ASTRON)

Universiteit Van Amsterdam

Franz Kirsten

Netherlands Institute for Radio Astronomy (ASTRON)

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

B. Marcote

Joint Institute for VLBI in Europe (JIVE)

U. Bach

Max-Planck-Gesellschaft

R. Blaauw

Netherlands Institute for Radio Astronomy (ASTRON)

M. Burgay

INAF Osservatorio Astronomico di Cagliari

A. Corongiu

INAF Osservatorio Astronomico di Cagliari

R. Feiler

Uniwersytet Mikolaja Kopernika

M. P. Gawronski

Uniwersytet Mikolaja Kopernika

M. Giroletti

Istituto nazionale di astrofisica (INAF)

R. Karuppusamy

Max-Planck-Gesellschaft

A. Keimpema

Joint Institute for VLBI in Europe (JIVE)

M. A. Kharinov

Russian Academy of Sciences

Michael Lindqvist

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

G. Maccaferri

Istituto nazionale di astrofisica (INAF)

A. Melnikov

Russian Academy of Sciences

A. Mikhailov

Russian Academy of Sciences

O. S. Ould-Boukattine

Universiteit Van Amsterdam

Z. Paragi

Joint Institute for VLBI in Europe (JIVE)

M. Pilia

INAF Osservatorio Astronomico di Cagliari

A. Possenti

INAF Osservatorio Astronomico di Cagliari

M. P. Snelders

Universiteit Van Amsterdam

G. Surcis

INAF Osservatorio Astronomico di Cagliari

M. Trudu

INAF Osservatorio Astronomico di Cagliari

T. Venturi

Istituto nazionale di astrofisica (INAF)

Wouter Vlemmings

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

N. Wang

Chinese Academy of Sciences

Jun Yang

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

J. Yuan

Chinese Academy of Sciences

Astrophysical Journal Letters

2041-8205 (ISSN) 2041-8213 (eISSN)

Vol. 927 1 L3

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan fysik

Multidisciplinär geovetenskap

DOI

10.3847/2041-8213/ac540f

Mer information

Senast uppdaterat

2022-03-29