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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The repeating FRB source, FRB 20201124A, was found to be highly active inMarch and April 2021. We observed the source with the Effelsberg 100-m radiotelescope at 1.36 GHz on 9 April 2021 and detected 20 bursts. A downward driftin frequency over time is clearly seen from the majority of bursts in oursample. A structure-maximizing dispersion measure (DM) search on themulti-component bursts in our sample yields a DM of 411.6$\pm$0.6 pc/cm$^3$. Wefind that the rotation measure (RM) of the bursts varies around their meanvalue of -605 rad/m$^2$ with a standard deviation of 11.1 rad/m$^2$. This RMmagnitude is 10 times larger than the expected Galactic contribution along thisline of sight (LoS). We estimate a LoS magnetic field strength of 4--6 $\mu$G,assuming that the entire host galaxy DM contributes to the RM. Furtherpolarization measurements will help determine FRB 20201124A's RM stability. Thebursts are highly linearly polarized, with some showing signs of circularpolarization, the first for a repeating FRB. Their polarization position angles(PAs) are flat across the burst envelopes and vary between bursts. We arguethat the varying polarization fractions and PAs of FRB 20201124A are similar toknown magnetospheric emission from pulsars, while the observed circularpolarization, combined with the RM variability, is hard to explain with Faradayconversion. The high linear polarization fractions, flat PAs, and downwarddrift from FRB 20201124A bursts are similar to previous repeating sources,while the observed circular polarization is a newly seen behaviour amongrepeaters.

Polarization properties of FRB 20201124A from detections with the 100-m Effelsberg Radio Telescope