Unraveling the Hybrid Origins of the X-Ray Nonthermal Emission from IGR J17091-3624
Journal article, 2024

We present a comprehensive study based on multiwavelength observations from the NuSTAR, NICER, Swift, Fermi, NEOWISE, and ATCA telescopes during the 2022 outburst of the black-hole X-ray binary IGR J17091-3624. Our investigation concentrates on the heartbeat-like variability in the X-ray emission, with the aim of using it as a tool to unravel the origin of the nonthermal emission during the heartbeat state. Through X-ray timing and spectral analysis, we observe that the heartbeat-like variability correlates with changes in the disk temperature, supporting the disk radiation pressure instability scenario. Moreover, in addition to a Comptonization component, our time-averaged and phase-resolved spectroscopy reveal the presence of a power-law component that varies independently from the disk component. Combined with the radio-X-ray spectral energy distribution fitting, our results suggest that the power-law component could originate from synchrotron self-Compton radiation in the jet, which requires a strong magnetic field of about B = (0.3-3.5) x 106 G. Additionally, assuming that IGR J17091-3624 and GRS 1915 + 105 share the same radio-X-ray correlation coefficient during both the hard and the heartbeat states, we obtain a distance of 13.7 +/- 2.3 kpc for IGR J17091-3624.

Author

Zikun Lin

Chinese Academy of Sciences

Yanan Wang

Chinese Academy of Sciences

Santiago Del Palacio

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Mariano Mendez

University of Groningen

Shuang-Nan Zhang

Chinese Academy of Sciences

Thomas D. Russell

Istituto nazionale di astrofisica (INAF)

Long Ji

Sun Yat-Sen University

Jin Zhang

Beijing Institute of Technology

Liang Zhang

Chinese Academy of Sciences

Diego Altamirano

University of Southampton

Jifeng Liu

Chinese Academy of Sciences

Beijing Normal University

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 974 1 79

Exploring the Hidden Dusty Nuclei of Galaxies (HIDDeN)

European Research Council (ERC) (789410), 2018-10-01 -- 2023-09-30.

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.3847/1538-4357/ad6b14

More information

Latest update

11/5/2024