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2020•Monthly Notices of the Royal Astronomical SocietyOpen access

Insight-HXMT observations of Swift J0243.6+6124: the evolution of RMS pulse fractions at super-Eddington luminosity

Peng-Ju Wang, Ling-Da Kong, S Zhang, S Zhang, Yong Chen, S N Zhang, S N Zhang, Jin‐Lu Qu, Long Ji, Lian Tao, Mingyu Ge, F. J. Lu, Lei Chen, L. M. Song, Ting Li, Y. P. Xu, X. L. Cao, Yong Chen, Chao‐Zong Liu, Qingcui Bu, Ce Cai, Zhi Chang, Gen Chen, Tao Chen, Y B Chen, Wei Cui, Wei Cui, J. K. Deng, Yongwei Dong, Yuanyuan Du, Mingye Fu, G. H. Gao, H. Gao, M. Gao, Yun-Jun Gu, Ju Guan, Chengcheng Guo, D. W. Han, Y. Huang, J. Huo, S. M. Jia, Luhua Jiang, Weichun Jiang, Jing Jin, Y J Jin, Bing Li, Cheng-Kui Li, Gang Li, Meiling Li, Wenfei Li, X Li, Xiaobing Li, X F Li, Yufan Li, Zhifeng Li, X. H. Liang, J. Y. Liao, B S Liu, Gaoming Liu, Hanwei Liu, Xiaoyu Liu, Y N Liu, Bo Lü, X. F. Lu, Q. Luo, T. Luo, Xiang Ma, Bin Meng, Y. Nang, J. Y. Nie, G. Ou, Na Sai, R. C. Shang, X. Y. Song, Liang Sun, Y. Tan, Y. L. Tuo, Chenye Wang, G F Wang, Juan Wang, Ling‐Jun Wang, W S Wang, Y S Wang, X. Y. Wen, Beichen Wu, Bobing Wu, M. Wu, G. Xiao, Shuo Xiao, S. L. Xiong, Yi-Jung Yang, S. Yang, Yan Ji Yang, Yi-Jung Yang, Q. B. Yi, Qian-Qing Yin, Yuan You, Ao Zhang, Chengmin Zhang, Fan Zhang, Hongming Zhang, Jiawen Zhang, Jujia Zhang, W C Zhang, W Zhang, Wenbo Zhang, Yuan Zhang, Y F Zhang, Yajiu Zhang, Yuan Zhang, Zhao Zhang, Zhi Zhang, Z L Zhang, Haisheng Zhao, Xiaofan Zhao, S. J. Zheng, Y. G. Zheng, D. K. Zhou, Jing Zhou, Yuxuan Zhu, Yuxuan Zhu, R. L. Zhuang

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Abstract

ABSTRACT Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017–2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 1038 erg s−1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.

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ABSTRACT Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017–2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 1038 erg s−1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.

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Available abstract

ABSTRACT Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017–2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 1038 erg s−1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.

Key concepts: Swift, Luminosity, Physics, Astrophysics, Pulse (music), Eddington luminosity, Astronomy, Optics

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