English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the detection of FRB20191107B with the UTMOST radio telescope at adispersion measure (DM) of 714.9 ${\rm pc~cm^{-3}}$. The burst consists ofthree components, the brightest of which has an intrinsic width of only 11.3$\mu$s and a scattering tail with an exponentially decaying time-scale of 21.4$\mu$s measured at 835 MHz. We model the sensitivity of UTMOST and other majorFRB surveys to such narrow events. We find that $>60\%$ of FRBs likeFRB20191107B are being missed, and that a significant population of very narrowFRBs probably exists and remains underrepresented in these surveys. The high DMand small scattering timescale of FRB20191107B allows us to place an upperlimit on the strength of turbulence in the Intergalactic Medium (IGM),quantified as scattering measure (SM), of ${\rm SM_{IGM} < 8.4 \times 10^{-7}~kpc~m^{-20/3}}$. Almost all UTMOST FRBs have full phase information due toreal-time voltage capture which provides us with the largest sample ofcoherently dedispersed single burst FRBs. Our 10.24 $\mu$s time resolution datayields accurately measured FRB scattering timescales. We combine the UTMOSTFRBs with 10 FRBs from the literature and find no obvious evidence for aDM-scattering relation, suggesting that IGM is not the dominant source ofscattering in FRBs. We support the results of previous studies and identify thelocal environment of the source in the host galaxy as the most likely regionwhich dominates the observed scattering of our FRBs.

The ultra narrow FRB20191107B, and the origins of FRB scattering