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19 April 2024 |
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Hard state accretion disk winds from black holes: the revealing case of MAXI J1820+070 | | T. Muñoz-Darias
; F. Jiménez-Ibarra
; G. Panizo-Espinar
; J. Casares
; D. Mata Sánchez
; G. Ponti
; R. P. Fender
; D. A. H. Buckley
; P. Garnavich
; M. A. P. Torres
; M. Armas Padilla
; P. A. Charles
; J. Corral-Santana
; J. J. E. Kajava
; E. J. Kotze
; C. Littlefield
; J. Sánchez-Sierras
; D. Steeghs
; J. Thomas
; | | Date: |
11 Jun 2019 | | Abstract: | We report on a detailed optical spectroscopic follow-up of the black hole
transient MAXI J1820+070 (ASASSN-18ey). The observations cover the main part of
the X-ray binary outburst, when the source alternated between hard and soft
states following the classical pattern widely seen in other systems. We focus
the analysis on the He I emission lines at 5876 and 6678 Angs, as well as on
Halpha. We detect clear accretion disk wind features (P-Cyg profiles and broad
emission line wings) in the hard state, both during outburst rise and decay.
These are not witnessed during the several months long soft state. However, our
data suggest that the visibility of the outflow might be significantly affected
by the ionisation state of the accretion disk. The terminal velocity of the
wind is above ~ 1200 km/s, similar to outflow velocities derived from (hard
state) optical winds and (soft state) X-ray winds in other systems. The wind
signatures, in particular the P-Cyg profiles, are very shallow, and their
detection has only been possible thanks to a combination of source brightness
and intense monitoring at very high signal-to-noise. This study indicates that
cold, optical winds are most likely a common feature of black hole accretion,
and therefore, that wind-like outflows are a general mechanism of mass and
angular momentum removal operating throughout the entire X-ray binary outburst. | | Source: | arXiv, 1906.4835 | | Services: | Forum | Review | PDF | Favorites | |
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