A variable ionized disk wind in the black-hole candidate EXO 1846-031
Abstract
After 34 years, 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 the disk self-irradiation. Both cases support EXO 1846-031 as a low inclination system of ~40 degrees. An absorption line is clearly detected at ~7.2 keV in the hard intermediate state, corresponding to a highly ionized disk wind (log {\xi} > 6.1) with a velocity up to 0.06c. Meanwhile, quasi-simultaneous radio emissions have been detected before and after the X-rays, implying the co-existence of disk winds and jets in this system. Additionally, the observed wind in this source is potentially driven by magnetic forces. 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 the higher spectral resolution are required to examine this.
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Cite
@article{arxiv.2010.14662,
title = {A variable ionized disk wind in the black-hole candidate EXO 1846-031},
author = {Yanan Wang and Long Ji and Javier A. Garcia and Thomas Dauser and Mariano Mendez and Junjie Mao and L. Tao and Diego Altamirano and Pierre Maggi and S. N. Zhang and M. Y. Ge and L. Zhang and J. L. Qu and S. Zhang and X. Ma and F. J. Lu and T. P. Li and Y. Huang and S. J. Zheng and Z. Chang and Y. L. Tuo and L. M. Song and Y. P. Xu and Y. Chen and C. Z. Liu and Q. C. Bu and C. Cai and X. L. Cao and L. Chen and T. X. Chen and Y. P. Chen and W. W. Cui and Y. Y. Du and G. H. Gao and Y. D. Gu and J. Guan and C. C. Guo and D. W. Han and J. Huo and S. M. Jia and W. C. Jiang and J. Jin and L. D. Kong and B. Li and C. K. Li and G. Li and W. Li and X. Li and X. B. Li and X. F. Li and Z. W. Li and X. H. Liang and J. Y. Liao and H. W. Liu and X. J. Liu and X. F. Lu and Q. Luo and T. Luo and B. Meng and Y. Nang and J. Y. Nie and G. Ou and N. Sai and R. C. Shang and X. Y. Song and L. Sun and Y. Tan and W. S. Wang and Y. D. Wang and Y. S. Wang and X. Y. Wen and B. B. Wu and B. Y. Wu and M. Wu and G. C. Xiao and S. Xiao and S. L. Xiong and S. Yang and Y. J. Yang and Q. B. Yi and Q. Q. Yin and Y. You and F. Zhang and H. M. Zhang and J. Zhang and W. C. Zhang and W. Zhang and Y. F. Zhang and H. S. Zhao and X. F. Zhao and D. K. Zhou},
journal= {arXiv preprint arXiv:2010.14662},
year = {2021}
}
Comments
Accepted for publication in ApJ