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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We report results of the first broadband observation of the transient X-raypulsar GRO J1008-57 performed in the quiescent state. Observations wereconducted quasi-simultaneously with the Mikhail Pavlinsky ART-XC telescope onboard SRG and NuSTAR right before the beginning of a Type I outburst. GROJ1008-57 was detected in the state with the lowest observed luminosity aroundseveral $\times 10^{34}$ erg s$^{-1}$ and consequently accreting from the colddisk. Timing analysis allowed to significantly detect pulsations during thisstate for the first time. The observed pulsed fraction of about 20\% is,however, almost three times lower than in brighter states when the accretionproceeds through the standard disk. We traced the evolution of the broadbandspectrum of the source on a scale of three orders of magnitude in luminosityand found that at the lowest luminosities the spectrum transforms into thedouble-hump structure similarly to other X-ray pulsars accreting at lowluminosities (X Persei, GX 304-1, A0535+262) reinforcing conclusion that thisspectral shape is typical for these objects.

SRG/ART-XC and NuSTAR observations of the X-ray pulsar GRO J1008-57 in the lowest luminosity state