تقرير
SRG/ART-XC and NuSTAR observations of the X-ray pulsar GRO J1008-57 in the lowest luminosity state
| العنوان: | SRG/ART-XC and NuSTAR observations of the X-ray pulsar GRO J1008-57 in the lowest luminosity state |
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| المؤلفون: | Lutovinov, A., Tsygankov, S., Molkov, S., Doroshenko, V., Mushtukov, A., Arefiev, V., Lapshov, I., Tkachenko, A., Pavlinsky, M. |
| سنة النشر: | 2021 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We report results of the first broadband observation of the transient X-ray pulsar GRO J1008-57 performed in the quiescent state. Observations were conducted quasi-simultaneously with the Mikhail Pavlinsky ART-XC telescope on board SRG and NuSTAR right before the beginning of a Type I outburst. GRO J1008-57 was detected in the state with the lowest observed luminosity around several $\times 10^{34}$ erg s$^{-1}$ and consequently accreting from the cold disk. Timing analysis allowed to significantly detect pulsations during this state for the first time. The observed pulsed fraction of about 20\% is, however, almost three times lower than in brighter states when the accretion proceeds through the standard disk. We traced the evolution of the broadband spectrum of the source on a scale of three orders of magnitude in luminosity and found that at the lowest luminosities the spectrum transforms into the double-hump structure similarly to other X-ray pulsars accreting at low luminosities (X Persei, GX 304-1, A0535+262) reinforcing conclusion that this spectral shape is typical for these objects. Comment: 8 pages, 5 figures, accepted to ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/abec43 |
| URL الوصول: | http://arxiv.org/abs/2103.05728 |
| رقم الأكسشن: | edsarx.2103.05728 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/abec43 |
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