Effect of radiation drag on the line-force-driven winds. Issue 4 (6th August 2022)

• Record Type: Journal Article
• Authors: Wang, Bei-Chuan; Yang, Xiao-Hong; Bu, De-Fu; Huang, Shu-Su
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 515:Issue 4(2022)
• Page Start: 5594
• Page End: 5603
• Publication Date: 2022-08-06
• Subjects: accretion, accretion discs -- ISM: jets and outflows -- galaxies: active -- quasars: general; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac2203
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: Ultra-fast outflows (UFOs) with mildly relativistic velocities are measured using the X-ray spectra of radio-quiet and -loud active galactic nuclei. In general, UFOs are believed to be generated from the accretion disc around a black hole. A line-force driving model is suggested to be the mechanism to drive UFOs from the accretion disc. In this paper, we use the non-hydrodynamic approach to examine the influences of radiation-drag effects on the line-force-driven winds generated from the accretion disc. We find that the radiation-drag effects can significantly weaken the line-force-driven winds. Compared with the case without the radiation-drag effects, when the radiation-drag effects are considered, the maximum speed of winds is reduced by ∼60 per cent–70 per cent, the mass outflow rate is reduced by ∼50 per cent–80 per cent, and the kinetic power is reduced by about an order of magnitude. The radiation-drag effects narrow the area where the winds are generated.