Repeating fast radio bursts with WSRT/Apertif
Artikel i vetenskaplig tidskrift, 2020
Aims. We aim to detect bursts from the first two repeating FRBs, FRB 121102 (R1) and FRB 180814.J0422+73 (R2), and to characterise their repeat statistics. We also want to significantly improve the sky localisation of R2 and identify its host galaxy.
Methods. We used the Westerbork Synthesis Radio Telescope to conduct extensive follow-up of these two repeating FRBs. The new phased-array feed system, Apertif, allows one to cover the entire sky position uncertainty of R2 with fine spatial resolution in a single pointing. The data were searched for bursts around the known dispersion measures of the two sources. We characterise the energy distribution and the clustering of detected R1 bursts. Results. We detected 30 bursts from R1. The non-Poissonian nature is clearly evident from the burst arrival times, which is consistent with earlier claims. Our measurements indicate a dispersion measure (DM) of 563.5(2) pc cm(-3), suggesting a significant increase in DM over the past few years. Assuming a constant position angle across the burst, we place an upper limit of 8% on the linear polarisation fraction for the brightest burst in our sample. We did not detect any bursts from R2.
Conclusions. A single power-law might not fit the R1 burst energy distribution across the full energy range or widely separated detections. Our observations provide improved constraints on the clustering of R1 bursts. Our stringent upper limits on the linear polarisation fraction imply a significant depolarisation, either intrinsic to the emission mechanism or caused by the intervening medium at 1400 MHz, which is not observed at higher frequencies. The non-detection of any bursts from R2, despite nearly 300 h of observations, implies either a highly clustered nature of the bursts, a steep spectral index, or a combination of the two assuming that the source is still active. Another possibility is that R2 has turned off completely, either permanently or for an extended period of time.
stars: neutron
radio continuum: general
pulsars: general
Författare
L. C. Oostrum
Netherlands Institute for Radio Astronomy (ASTRON)
Universiteit Van Amsterdam
Y. Maan
Netherlands Institute for Radio Astronomy (ASTRON)
J. van Leeuwen
Universiteit Van Amsterdam
Netherlands Institute for Radio Astronomy (ASTRON)
L. Connor
Universiteit Van Amsterdam
Netherlands Institute for Radio Astronomy (ASTRON)
E. Petroff
Universiteit Van Amsterdam
J. J. Attema
Netherlands eScience Center
J. E. Bast
Netherlands Institute for Radio Astronomy (ASTRON)
D. W. Gardenier
Universiteit Van Amsterdam
Netherlands Institute for Radio Astronomy (ASTRON)
J. E. Hargreaves
Netherlands Institute for Radio Astronomy (ASTRON)
E. Kooistra
Netherlands Institute for Radio Astronomy (ASTRON)
D. van der Schuur
Netherlands Institute for Radio Astronomy (ASTRON)
A. Sclocco
Netherlands eScience Center
R. Smits
Netherlands Institute for Radio Astronomy (ASTRON)
S. M. Straal
New York University Abu Dhabi
S. ter Veen
Netherlands Institute for Radio Astronomy (ASTRON)
D. Vohl
Netherlands Institute for Radio Astronomy (ASTRON)
E. A. K. Adams
Kapteyn Astronomical Institute
Netherlands Institute for Radio Astronomy (ASTRON)
B. Adebahr
Ruhr-Universität Bochum
W. J. G. de Blok
Netherlands Institute for Radio Astronomy (ASTRON)
University of Cape Town
Kapteyn Astronomical Institute
R. H. van den Brink
Tricas Industrial Design & Engineering
Netherlands Institute for Radio Astronomy (ASTRON)
W. A. van Cappellen
Netherlands Institute for Radio Astronomy (ASTRON)
A. H. W. M. Coolen
Netherlands Institute for Radio Astronomy (ASTRON)
S. Damstra
Netherlands Institute for Radio Astronomy (ASTRON)
G. N. J. van Diepen
Netherlands Institute for Radio Astronomy (ASTRON)
B. S. Frank
South African Radio Astronomy Observatory (SARAO)
University of Cape Town
K. M. Hess
Netherlands Institute for Radio Astronomy (ASTRON)
Kapteyn Astronomical Institute
J. M. van der Hulst
Kapteyn Astronomical Institute
B. Hut
Netherlands Institute for Radio Astronomy (ASTRON)
Marianna Ivashina
Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk
G. M. Loose
Netherlands Institute for Radio Astronomy (ASTRON)
D. M. Lucero
Virginia Polytechnic Institute and State University
A. Mika
Netherlands Institute for Radio Astronomy (ASTRON)
R. H. Morganti
Netherlands Institute for Radio Astronomy (ASTRON)
Kapteyn Astronomical Institute
V. A. Moss
Netherlands Institute for Radio Astronomy (ASTRON)
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
The University of Sydney
H. Mulder
Netherlands Institute for Radio Astronomy (ASTRON)
M. J. Norden
Netherlands Institute for Radio Astronomy (ASTRON)
T. A. Oosterloo
Netherlands Institute for Radio Astronomy (ASTRON)
Kapteyn Astronomical Institute
E. Orru
Netherlands Institute for Radio Astronomy (ASTRON)
J. P. R. de Reijer
Netherlands Institute for Radio Astronomy (ASTRON)
M. Ruiter
Netherlands Institute for Radio Astronomy (ASTRON)
N. J. Vermaas
Netherlands Institute for Radio Astronomy (ASTRON)
S. J. Wijnholds
Netherlands Institute for Radio Astronomy (ASTRON)
J. Ziemke
Netherlands Institute for Radio Astronomy (ASTRON)
Rijksuniversiteit Groningen
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 635 A61Ämneskategorier
Astronomi, astrofysik och kosmologi
Elektroteknik och elektronik
DOI
10.1051/0004-6361/201937422