Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03

Tuo, Y. L.; Ji, L.; Tsygankov, S. S.; Mihara, T.; Song, L. M.; Ge, M. Y.; Nabizadeh, A.; Tao, L.; Qu, J. L.; Zhang, Y.; Zhang, S.; Zhang, S. N.; Bu, Q. C.; Chen, L.; Xu, Y. P.; Cao, X. L.; Chen, Y.; Liu, C. Z.; Cai, C.; Chang, Z.; Chen, G.; Chen, T. X.; Chen, Y. B.; Chen, Y. P.; Cui, W.; Cui, W. W.; Deng, J. K.; Dong, Y. W.; Du, Y. Y.; Fu, M. X.; Gao, G. H.; Gao, H.; Gao, M.; Gu, Y. D.; Guan, J.; Guo, C. C.; Han, D. W.; Huang, Y.; Huo, J.; Jia, S. M.; Jiang, L. H.; Jiang, W. C.; Jin, J.; Jin, Y. J.; Kong, L. D.; Li, B.; Li, C. K.; Li, G.; Li, M. S.; Li, T. P.; Li, W.; Li, X.; Li, X. B.; Li, X. F.; Li, Y. G.; Li, Z. W.; Liang, X. H.; Liao, J. Y.; Liu, B. S.; Liu, G. Q.; Liu, H. W.; Liu, X. J.; Liu, Y. N.; Lu, B.; Lu, F. J.; Lu, X. F.; Luo, Q.; Luo, T.; Ma, X.; Meng, B.; Nang, Y.; Nie, J. Y.; Ou, G.; Sai, N.; Shang, R. C.; Song, X. Y.; Sun, L.; Tan, Y.; Wang, C.; Wang, G. F.; Wang, 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, J. W.; Yang, S.; Yang, Y. J.; Yi, Q. B.; Yin, Q. Q.; You, Y.; Zhang, A. M.; Zhang, C. M.; Zhang, F.; Zhang, H. M.; Zhang, J.; Zhang, T.; Zhang, W.; Zhang, W. C.; Zhang, W. Z.; Zhang, Y. F.; Zhang, Y. J.; Zhang, Y. H.; Zhang, Z.; Zhang, Z. L.; Zhao, H. S.; Zhao, X. F.; Zheng, S. J.; Zheng, Y. G.; Zhou, D. K.; Zhou, J. F.; Zhu, Y. X.; Zhu, Y.; Zhuang, R. L.

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Journal of High Energy Astrophysics, (27), p. 38-43, 2020

DOI: 10.1016/j.jheap.2020.03.003

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Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03

Journal article published in 2020 by Y. L. Tuo

, L. Ji

, S. S. Tsygankov

, T. Mihara, L. M. Song, M. Y. Ge, A. Nabizadeh, L. Tao, J. L. Qu, Y. Zhang, S. Zhang, S. N. Zhang, Q. C. Bu, L. Chen, Y. P. Xu and other authors.

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Abstract

We use the Insight-HXMT data collected during the 2019 outburst from X-ray pulsar 4U 1901+03 to complement the orbital parameters reported by Fermi/GBM. Using the Insight-HXMT, we examine the correlation between the derivative of the intrinsic spin frequency and bolometric flux based on accretion torque models. It was found that the pulse profiles significantly evolve during the outburst. The existence of two types of the profile's pattern discovered in the Insight-HXMT data indicates that this source experienced transition between a super-critical and a sub-critical accretion regimes during its 2019 outburst. Based on the evolution of the pulse profiles and the torque model, we derive the distance to 4U 1901+03 as 12.4±0.2kpc.

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Insight-HXMT insight into switch of the accretion mode: The case of the X-ray pulsar 4U 1901+03

Abstract