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Highly polarized microstructure from the repeating FRB 20180916B

Nimmo, K. (author)
Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Van Amsterdam,University of Amsterdam
Hessels, J. W. T. (author)
Universiteit Van Amsterdam,University of Amsterdam,Netherlands Institute for Radio Astronomy (ASTRON)
Keimpema, A. (author)
Joint Institute for VLBI in Europe (JIVE)
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Archibald, A. M. (author)
University of Newcastle
Cordes, J. M. (author)
Cornell University
Karuppusamy, R. (author)
Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
Kirsten, Franz, 1983 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Li, D. Z. (author)
Institut canadien d'astrophysique théorique,Canadian Institute for Theoretical Astrophysics,University of Toronto
Marcote, B. (author)
Joint Institute for VLBI in Europe (JIVE)
Paragi, Z. (author)
Joint Institute for VLBI in Europe (JIVE)
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 (creator_code:org_t)
2021-03-22
2021
English.
In: Nature Astronomy. - : Springer Science and Business Media LLC. - 2397-3366. ; 5:6, s. 594-603
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Fast radio bursts (FRBs) are bright, coherent, short-duration radio transients of as-yet unknown extragalactic origin. FRBs exhibit a variety of spectral, temporal and polarimetric properties that can unveil clues into their emission physics and propagation effects in the local medium. Here, we present the high-time-resolution (down to 1 mu s) polarimetric properties of four 1.7 GHz bursts from the repeating FRB 20180916B, which were detected in voltage data during observations with the European Very Long Baseline Interferometry Network. We observe a range of emission timescales that spans three orders of magnitude, with the shortest component width reaching 3-4 mu s (below which we are limited by scattering). We demonstrate that all four bursts are highly linearly polarized (greater than or similar to 80%), show no evidence of significant circular polarization (less than or similar to 15%), and exhibit a constant polarization position angle (PPA) during and between bursts. On short timescales (less than or similar to 100 mu s), however, there appear to be subtle PPA variations (of a few degrees) across the burst profiles. These observational results are most naturally explained in an FRB model in which the emission is magnetospheric in origin, in contrast to models in which the emission originates at larger distances in a relativistic shock. High-time-resolution observations of the repeating fast radio burst source FRB 20180916B reveal changes to the polarization properties of the emission on timescales of a few microseconds, indicating an origin in the source magnetosphere.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

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