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A Variable Ionized Disk Wind in the Black Hole Candidate EXO 1846–031

Wang, Yanan and Ji, Long and García, Javier A. and Dauser, Thomas and Méndez, Mariano and Mao, Junjie and Tao, L. and Altamirano, Diego and Maggi, Pierre and Zhang, S. N. and Ge, M. Y. and Zhang, L. and Qu, J. L. and Zhang, S. and Ma, X. and Lu, F. J. and Li, T. P. and Huang, Y. and Zheng, S. J. and Chang, Z. and Tuo, Y. L. and Song, L. M. and Xu, Y. P. and Chen, Y. and Liu, C. Z. and Bu, Q. C. and Cai, C. and Cao, X. L. and Chen, L. and Chen, T. X. and Chen, Y. P. and Cui, W. W. and Du, Y. Y. and Gao, G. H. and Gu, Y. D. and Guan, J. and Guo, C. C. and Han, D. W. and Huo, J. and Jia, S. M. and Jiang, W. C. and Jin, J. and Kong, L. D. and Li, B. and Li, C. K. and Li, G. and Li, W. and Li, X. and Li, X. B. and Li, X. F. and Li, Z. W. and Liang, X. H. and Liao, J. Y. and Liu, H. W. and Liu, X. J. and Lu, X. F. and Luo, Q. and Luo, T. and Meng, B. and Nang, Y. and Nie, J. Y. and Ou, G. and Sai, N. and Shang, R. C. and Song, X. Y. and Sun, L. and Tan, Y. and Wang, W. S. and Wang, Y. D. and Wang, Y. S. and Wen, X. Y. and Wu, B. B. and Wu, B. Y. and Wu, M. and Xiao, G. C. and Xiao, S. and Xiong, S. L. and Yang, S. and Yang, Y. J. and Yi, Q. B. and Yin, Q. Q. and You, Y. and Zhang, F. and Zhang, H. M. and Zhang, J. and Zhang, W. C. and Zhang, W. and Zhang, Y. F. and Zhao, H. S. and Zhao, X. F. and Zhou, D. K. (2021) A Variable Ionized Disk Wind in the Black Hole Candidate EXO 1846–031. Astrophysical Journal, 906 (1). Art. No. 11. ISSN 1538-4357.

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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 ~40°. An absorption line is clearly detected at ~7.2 keV in the hard intermediate state, corresponding to a highly ionized disk wind (log} ξ > 6.1) 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
García, Javier A.0000-0003-3828-2448
Dauser, Thomas0000-0003-4583-9048
Tao, L.0000-0002-2705-4338
Altamirano, Diego0000-0002-3422-0074
Zhang, S. N.0000-0001-5586-1017
Ge, M. Y.0000-0002-2749-6638
Zhang, L.0000-0003-4498-9925
Qu, J. L.0000-0002-9796-2585
Lu, F. J.0000-0003-3248-6087
Chen, Y.0000-0001-9834-2196
Bu, Q. C.0000-0001-5238-3988
Jia, S. M.0000-0002-5203-8321
Kong, L. D.0000-0003-3188-9079
Li, B.0000-0002-0238-834X
Li, C. K.0000-0001-5798-4491
Li, G.0000-0001-5067-1599
Li, X. F.0000-0002-2793-9857
Luo, Q.0000-0003-1853-7810
Yin, Q. Q.0000-0001-7580-1513
Alternate Title:A variable ionized disk wind in the black-hole candidate EXO 1846-031
Additional Information:© 2020. The American Astronomical Society. Received 2020 July 30; revised 2020 October 25; accepted 2020 October 26; published 2020 December 29. We are grateful to Timothy R. Kallman for help with xstar. We thank the anonymous referee for the helpful comments. This work made use of the data from the Insight-HXMT mission, a project funded by China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). The Insight-HXMT team gratefully acknowledges the support from the National Program on Key Research and Development Project (grant No. 2016YFA0400800) from the Minister of Science and Technology of China (MOST) and the Strategic Priority Research Program of the Chinese Academy of Sciences (grant No. XDB23040400). The authors thank the support from the National Natural Science Foundation of China under grant Nos. 11673023, 11733009, 11603037, 11973052, U1838201, U1838115, U1938103, and U1838202. Y.W. and L.Z. acknowledge support from the Royal Society Newton Funds. D.A. acknowledges support from the Royal Society. J.M. acknowledges the support from STFC (UK) through the University of Strathclyde UK APAP network grant ST/R000743/1. J.A.G. acknowledges support from NASA grant 80NSSC20K1238 and from the Alexander von Humboldt Foundation. Additionally, this work has made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS), jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). Software: XSPEC (v12.11.1; Arnaud 1996), NuSTARDAS (v2.0.0), HXMTDAS (v2.02; Zhang et al. 2020).
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
China National Space AdministrationUNSPECIFIED
Chinese Academy of SciencesXDB23040400
National Key Research and Development Program of China2016YFA0400800
National Natural Science Foundation of China11673023
National Natural Science Foundation of China11733009
National Natural Science Foundation of China11603037
National Natural Science Foundation of China11973052
National Natural Science Foundation of ChinaU1838201
National Natural Science Foundation of ChinaU1838115
National Natural Science Foundation of ChinaU1938103
National Natural Science Foundation of ChinaU1838202
Science and Technology Facilities Council (STFC)ST/R000743/1
Alexander von Humboldt FoundationUNSPECIFIED
Subject Keywords:High energy astrophysics ; X-ray transient sources ; Accretion
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: High energy astrophysics (739); X-ray transient sources (1852); Accretion (14)
Record Number:CaltechAUTHORS:20210112-151231714
Persistent URL:
Official Citation:Yanan Wang et al 2021 ApJ 906 11
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107445
Deposited By: George Porter
Deposited On:13 Jan 2021 16:34
Last Modified:13 Jan 2021 16:34

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