SIMBAD references

In order to reveal the origin of the ultrafast outflows (UFOs) that are frequently observed in active galactic nuclei (AGNs), we perform two-dimensional radiation hydrodynamics simulations of the line-driven disc winds, which are accelerated by the radiation force due to the spectral lines. The line-driven winds are successfully launched for the range of M_BH = 10^6–9 M_☉ and ε = 0.1-0.5, and the resulting mass outflow rate (dot{M_w}), momentum flux (dot{p_w}), and kinetic luminosity (dot{E_w}) are in the region containing 90 per cent of the posterior probability distribution in the dot{M}_w–Lbol_ plane, dot{p}_w–Lbol_ plane, and dot{E}_w–Lbol_ plane shown in Gofford et al., where M_BH is the black hole mass, ε is the Eddington ratio, and L_bol is the bolometric luminosity. The best-fitting relations in Gofford et al., d log dot{M_w}/d log {L_bol} 0.9, d log dot{p_w}/d log {L_bol} 1.2, and d log dot{E_w}/d log {L_bol} 1.5, are roughly consistent with our results, d log dot{M_w}/d log {L_bol} 9/8, d log dot{p_w}/d log {L_bol} 10/8, and d log dot{E_w}/d log {L_bol} 11/8. In addition, our model predicts that no UFO features are detected for the AGNs with ε <= 0.01, since the winds do not appear. Also, only AGNs with M_BH <= 10⁸ M_☉ exhibit the UFOs when ε ∼ 0.025. These predictions nicely agree with the X-ray observations. These results support that the line-driven disc wind is the origin of the UFOs.