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 present radio observations of the most slowly rotating known radio pulsarPSR J0250+5854. With a 23.5 s period, it is close, or even beyond, the$P$-$\dot{P}$ diagram region thought to be occupied by active pulsars. Thesimultaneous observations with FAST, the Chilbolton and Effelsberg LOFARinternational stations, and NenuFAR represent a five-fold increase in thespectral coverage of this object, with the detections at 1250 MHz (FAST) and 57MHz (NenuFAR) being the highest- and lowest-frequency published respectively todate. We measure a flux density of $4\pm2$ $\mu$Jy at 1250 MHz and anexceptionally steep spectral index of $-3.5^{+0.2}_{-1.5}$, with a turnoverbelow $\sim$95 MHz. In conjunction with observations of this pulsar with theGBT and the LOFAR Core, we show that the intrinsic profile width increasesdrastically towards higher frequencies, contrary to the predictions ofconventional radius-to-frequency mapping. We examine polarimetric data fromFAST and the LOFAR Core and conclude that its polar cap radio emission isproduced at an absolute height of several hundreds of kilometres around 1.5GHz, similar to other rotation-powered pulsars across the population. Its beamis significantly underfilled at lower frequencies, or it narrows because of thedisappearance of conal outriders. Finally, the results for PSR J0250+5854 andother slowly spinning rotation-powered pulsars are contrasted with theradio-detected magnetars. We conclude that magnetars have intrinsically widerradio beams than the slow rotation-powered pulsars, and that consequently thelatter's lower beaming fraction is what makes objects such as PSR J0250+5854 soscarce.

A broadband radio study of PSR J0250+5854: the slowest-spinning radio pulsar known