Detection of two bright radio bursts from magnetar SGR 1935+2154
Artikel i vetenskaplig tidskrift, 2020

Fast radio bursts are millisecond-duration, bright radio signals (fluence 0.1-100 Jy ms) emitted from extragalactic sources of unknown physical origin. The recent CHIME/FRB and STARE2 detection of an extremely bright (fluence similar to MJy ms) radio burst from the Galactic magnetar SGR 1935+2154 supports the hypothesis that (at least some) fast radio bursts are emitted by magnetars at cosmological distances. In follow-up observations totalling 522.7 h on source, we detect two bright radio bursts with fluences of 112 +/- 22 Jy ms and 24 +/- 5 Jy ms, respectively. Both bursts appear to be affected by interstellar scattering and we measure significant linear and circular polarization for the fainter burst. The bursts are separated in time by similar to 1.4 s, suggesting a non-Poissonian, clustered emission process-similar to those seen in some repeating fast radio bursts. Together with the burst reported by CHIME/FRB and STARE2, as well as a much fainter burst seen by FAST (fluence 60 mJy ms), our observations demonstrate that SGR 1935+2154 can produce bursts with apparent energies spanning roughly seven orders of magnitude, and that the burst rate is comparable across this range. This raises the question of whether these four bursts arise from similar physical processes, and whether the fast radio burst population distribution extends to very low energies (similar to 10(30) erg, isotropic equivalent).

Författare

Franz Kirsten

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

M. P. Snelders

Universiteit Van Amsterdam

M. Jenkins

Universiteit Van Amsterdam

K. Nimmo

Netherlands Institute for Radio Astronomy (ASTRON)

Universiteit Van Amsterdam

J. van den Eijnden

Universiteit Van Amsterdam

University of Oxford

J. W. T. Hessels

Netherlands Institute for Radio Astronomy (ASTRON)

Universiteit Van Amsterdam

M. P. Gawronski

Uniwersytet Mikolaja Kopernika

Jun Yang

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

NATURE ASTRONOMY

2397-3366 (ISSN)

Vol. In Press

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan fysik

DOI

10.1038/s41550-020-01246-3

Mer information

Senast uppdaterat

2020-12-10