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 on the discovery of pulsations at a period of ~47 s in thepersistent X-ray source 1RXS J225352.8+624354 (1RXS J2253) using five Chandraobservations performed in 2009. The signal was also detected in Swift and ROSATdata, allowing us to infer over a 16-yr baseline an average, long-term periodincreasing rate of ~17 ms per year and therefore to confirm the signal as thespin period of an accreting, spinning-down neutron star. The pulse profile of1RXS J2253 (~50-60% pulsed fraction) is complex and energy independent (withinthe statistical uncertainties). The 1-10 keV Chandra spectra are well fit by anabsorbed power-law model with photon index ~1.4 and observed flux of (2-5)e-12erg cm^-2 s^-1. The source was also detected by INTEGRAL in the 17-60 keV bandat a persistent flux of ~6e-12 erg cm^-2 s^-1, implying a spectral cut offaround 15 keV. We also carried out optical spectroscopic follow-up observationsof the 2MASS counterpart at the Nordic Optical Telescope. This made it possibleto first classify the companion of 1RXS J2253 as a B0-1III-Ve (most likely aB1Ve) star at a distance of about 4-5 kpc (favouring an association with thePerseus arm of the Galaxy). The latter finding implies an X-ray luminosity of~3e34 erg s^-1, suggesting that 1RXS J2253 is a new member of the sub-class oflow-luminosity long-orbital-period persistent Be/X-ray pulsars in a wide andcircular orbit (such as X Persei).

Discovery of 47-s pulsations in the X-ray source 1RXS J225352.8+624354