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 spectral and timing analysis of NuSTAR observations of theaccreting X-ray pulsar 2RXP J130159.6-635806. The source was serendipitouslyobserved during a campaign focused on the gamma-ray binary PSR B1259-63 and waslater targeted for a dedicated observation. The spectrum has a typical shapefor accreting X-ray pulsars, consisting of a simple power law with anexponential cutoff starting at ~7 keV with a folding energy of E_fold=~18 keV.There is also an indication of the presence of a 6.4 keV iron line in thespectrum at the ~3 sigma significance level. NuSTAR measurements of thepulsation period reveal that the pulsar has undergone a strong and steadyspin-up for the last 20 years. The pulsed fraction is estimated to be ~80%, andis constant with energy up to 40 keV. The power density spectrum shows a breaktowards higher frequencies relative to the current spin period. This, togetherwith steady persistent luminosity, points to a long-term mass accretion ratehigh enough to bring the pulsar out of spin equilibrium.

NuSTAR discovery of an unusually steady long-term spin-up of the Be binary 2RXP J130159.6-635806