Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 504, Issue 2, Pages 2493-2500Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab938
Keywords
pulsars: individual: GX 301-2; X-rays: binaries
Categories
Funding
- China National Space Administration (CNSA)
- Chinese Academy of Sciences (CAS)
- National Key Research and Development Program of China [2016YFA0400800]
- National Natural Science Foundation of China [U1938113, 11773035, U1838201, U1938101, U1838202, 11473027, 11733009, U1838115]
- Scholar Program of Beijing Academy of Science and Technology [DZ BS202002]
- Russian Science Foundation [19-12-00423]
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The study of GX 301-2 reveals significant differences in pulse profiles, luminosity, and absorption column densities between the rapid spin-up event and wind-fed state. These findings support the hypothesis that most material is condensed into a disc during the spin-up period.
GX 301-2 provides a rare opportunity to study both disc and wind accretion in a same target. We report Insight-Hard X-ray Modulation Telescope observations of the spin-up event of GX 301-2 that happened in 2019 and compare with those of wind-fed state. The pulse profiles of the initial rapid spin-up period are dominated by one main peak, while those of the later slow spin-up period are composed of two similar peaks, as those of wind-fed state. These behaviours are confirmed by Fermi/Gamma-ray Burst Monitor data, which also show that during the rapid spin-up period, the main peak increases with luminosity up to 8 x 10(37) ergs(-1), but the faint peak remains almost constant. The absorption column densities during the spin-up period are similar to 1.5 x 10(23)cm(-2), much less than those of wind-fed state at similar luminosity (similar to 9 x 10(23)cm(-2)), supporting the scenario that most of material is condensed into a disc during the spin-up period. We discuss possible differences between disc and wind accretion that may explain the observed different trends of pulse profiles.
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