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Wang, Yanan; Ji, Long; García, Javier A.; Dauser, Thomas; Méndez, Mariano; Mao, Junjie; Tao, L.; Altamirano, Diego; Maggi, Pierre; Zhang, S. N.; Ge, M. Y.; Zhang, L.; Qu, J. L.; Zhang, S.; Ma, X.; Lu, F. J.; Li, T. P.; Huang, Y.; Zheng, S. J.; Chang, Z.; Tuo, Y. L.; Song, L. M.; Xu, Y. P.; Chen, Y.; Liu, C. Z.; Bu, Q. C.; Cai, C.; Cao, X. L.; Chen, L.; Chen, T. X.; Chen, Y. P.; Cui, W. W.; Du, Y. Y.; Gao, G. H.; Gu, Y. D.; Guan, J.; Guo, C. C.; Han, D. W.; 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. B.; Li, X. F.; Li, Z. W.; Liang, X. H.; Liao, J. Y.; Liu, H. W.; Liu, X. J.; Lu, X. F.; Luo, Q.; Luo, T.; Meng, B.; Nang, Y.; Nie, J. Y.; Ou, G.; Sai, N.; Shang, R. C.; Song, X. Y.; Sun, L.; Tan, Y.; Wang, W. S.; Wang, Y. D.; Wang, Y. S.; Wen, X. Y.; Wu, B. B.; Wu, B. Y.; Wu, M.; Xiao, G. C.; Xiao, S.; Xiong, S. L.; Yang, S.; Yang, Y. J.; Yi, Q. B.; Yin, Q. Q.; You, Y.; Zhang, F.; Zhang, H. M.; Zhang, J.; Zhang, W. C.; Zhang, W.; Zhang, Y. F.; Zhao, H. S.; Zhao, X. F.; Zhou, D. K.
The Astrophysical journal, 01/2021, Volume: 906, Issue: 1Journal Article
After 34 yr, the black hole candidate EXO 1846-031 went into outburst again in 2019. We investigate its spectral properties in the hard intermediate and the soft states with NuSTAR and Insight-HXMT. A reflection component has been detected in the two spectral states but possibly originating from different illumination spectra: in the intermediate state, the illuminating source is attributed to a hard coronal component, which has been commonly observed in other X-ray binaries, whereas in the soft state, the reflection is probably produced by disk self-irradiation. Both cases support EXO 1846-031 as a low-inclination system of . An absorption line is clearly detected at ∼7.2 keV in the hard intermediate state, corresponding to a highly ionized disk wind ( ) with a velocity of up to 0.06c. Meanwhile, quasi-simultaneous radio emissions have been detected before and after the X-rays, implying the coexistence of disk winds and jets in this system. If only the high-flux segment of the NuSTAR observation is considered, the observed wind appears to be magnetically driven. The absorption line disappeared in the soft state and a narrow emission line appeared at ∼6.7 keV on top of the reflection component, which may be evidence for disk winds, but data with higher spectral resolution are required to examine this.
