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

We report on Westerbork Synthesis Radio Telescope observations of the Crabpulsar at 350 MHz from 2012 November 24 until 2015 June 21. During this periodwe consistently observe variations in the pulse profile of the Crab. Bothvariations in the scattering width of the pulse profile as well as delayedcopies, also known as echoes, are seen regularly. These observations supportthe classification of two types of echoes: those that follow the truncatedexponential shape expected for the thin-screen scattering approximation, andechoes that show a smoother, more Gaussian shape. During a sequence ofhigh-cadence observations in 2015, we find that these non-exponential echoesevolve in time by approaching the main pulse and interpulse in phase,overlapping the main pulse and interpulse, and later receding. We find a pulsescatter-broadening time scale, $\tau$, scaling with frequency as$\nu^{\alpha}$, with $\alpha=-3.9\pm0.5$, which is consistent with expectedvalues for thin-screen scattering models

Scattering features and variability of the Crab pulsar