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X-ray reprocessing in accreting pulsar GX 301-2 observed with Insight-HXMT
Ji, L.; Doroshenko, V.; Suleimanov, V.; Santangelo, A.; Orlandini, M.; Liu, J.; Ducci, L.; Zhang, S. N.; Nabizadeh, A.; Gavran, D.; Zhang, S.; Ge, M. Y.; Li, X. B.; Tao, L.; Bu, Q. C.; Qu, J. L.; Lu, F. J.; Chen, L.; Song, L. M.; Li, T. P.; Xu, Y. P.; Cao, X. L.; Chen, Y.; Liu, C. Z.; Cai, C.; Chang, Z.; Chen, T. X.; Chen, Y. P.; Cui, W. W.; Du, Y. Y.; Gao, G. H.; Gao, H.; Gu, Y. D.; Guan, J.; Guo, C. C.; Han, D. W.; Huang, Y.; Huo, J.; Jia, S. M.; Jiang, W. C.; Jin, J.; Kong, L. D.; Li, B.; Li, C. K.; Li, G.; Li, W.; Li, X.; Li, X. F.; Li, Z. W.; Liang, X. H.; Liao, J. Y.; Liu, B. S.; Liu, H. X.; Liu, H. W.; Liu, X. J.; Lu, X. F.; Luo, Q.; Luo, T.; Ma, R. C.; Ma, X.; Meng, B.; Nang, Y.; Nie, J. Y.; Ou, G.; Ren, X. Q.; Sai, N.; Song, X. Y.; Sun, L.; Tan, Y.; Tuo, Y. L.; Wang, C.; Wang, L. J.; Wang, P. J.; Wang, W. S.; Wang, Y. S.; Wen, X. Y.; Wu, B. Y.; Wu, B. B.; Wu, M.; Xiao, G. C.; Xiao, S.; Xiong, S. L.; Yang, R. J.; Yang, S.; Yang, Yan-Ji; Yang, Yi-Jung; Yi, Q. B.; Yin, Q. Q.; You, Y.; Zhang, F.; Zhang, H. M.; Zhang, J.; Zhang, P.; Zhang, W.; Zhang, W. C.; Zhang, Yi; Zhang, Y. F.; Zhang, Y. H.; Zhao, H. S.; Zhao, X. F.; Zheng, S. J.; Zheng, Y. G.; Zhou, D. K.
Source PublicationMonthly Notices of the Royal Astronomical Society
SubtypeJournal Article

We investigate the absorption and emission features in observations of GX 301-2 detected with Insight-HXMT/LE in 2017-2019. At different orbital phases, we found prominent Fe Kα, Kβ, and Ni Kα lines, as well as Compton shoulders and Fe K-shell absorption edges. These features are due to the X-ray reprocessing caused by the interaction between the radiation from the source and surrounding accretion material. According to the ratio of iron lines (Kα and Kβ), we infer the accretion material is in a low ionization state. We find an orbital-dependent local absorption column density, which has a large value and strong variability around the periastron. We explain its variability as a result of inhomogeneities of the accretion environment and/or instabilities of accretion processes. In addition, the variable local column density is correlated with the equivalent width of the iron Kα lines throughout the orbit, which suggests that the accretion material near the neutron star is spherically distributed.

Keywordstars: neutron X-rays: binaries X-rays: individual: GX 301-2
WOS IDWOS:000608475600068
ADS Bibcode2021MNRAS.501.2522J
ADS URLhttps://ui.adsabs.harvard.edu/abs/2021MNRAS.501.2522J
Citation statistics
Cited Times:3 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Ji, L.,Doroshenko, V.,Suleimanov, V.,et al. X-ray reprocessing in accreting pulsar GX 301-2 observed with Insight-HXMT[J]. Monthly Notices of the Royal Astronomical Society,2021,501:2522.
APA Ji, L..,Doroshenko, V..,Suleimanov, V..,Santangelo, A..,Orlandini, M..,...&Zhou, D. K..(2021).X-ray reprocessing in accreting pulsar GX 301-2 observed with Insight-HXMT.Monthly Notices of the Royal Astronomical Society,501,2522.
MLA Ji, L.,et al."X-ray reprocessing in accreting pulsar GX 301-2 observed with Insight-HXMT".Monthly Notices of the Royal Astronomical Society 501(2021):2522.
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