Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070
The black hole transient MAXI J1820+070 displayed optical P Cyg profiles and other wind-related emission line features during the hard state of its discovery outburst. We present near-infrared (NIR) spectroscopy covering the different accretion states of the system during this event. Our eight-epoch data set (VLT/X-shooter) reveals strong
Sánchez-Sierras, J. et al.
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2020