Line-driven disk wind model for ultra-fast outflows in active galactic nuclei -- Scaling with luminosity

Mariko Nomura; Ken Ohsuga

doi:10.1093/mnras/stw2877

paper

Line-driven disk wind model for ultra-fast outflows in active galactic nuclei -- Scaling with luminosity

arXiv:1610.08511 · doi:10.1093/mnras/stw2877

Abstract

In order to reveal the origin of the ultra-fast outflows (UFOs) that are frequently observed in active galactic nuclei (AGNs), we perform two-dimensional radiation hydrodynamics simulations of the line-driven disk winds, which are accelerated by the radiation force due to the spectral lines. The line-driven winds are successfully launched for the range of $M_{BH} = 1 0^{6 - 9} M_{⊙}$ and $ε$ =0.1-0.5, and the resulting mass outflow rate ( $M_{w} ˙$ ), momentum flux ( $p_{w} ˙$ ), and kinetic luminosity ( $E_{w} ˙$ ) are in the region containing 90% of the posterior probability distribution in the $M ˙_{w}$ - $L_{bol}$ plane, $p ˙_{w}$ - $L_{bol}$ plane, and $E ˙_{w}$ - $L_{bol}$ 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., $d lo g M_{w} ˙ / d lo g L_{bol} \sim 0.9$ , $d lo g p_{w} ˙ / d lo g L_{bol} \sim 1.2$ , and $d lo g E_{w} ˙ / d lo g L_{bol} \sim 1.5$ , are roughly consistent with our results, $d lo g M_{w} ˙ / d lo g L_{bol} \sim 9/8$ , $d lo g p_{w} ˙ / d lo g L_{bol} \sim 10/8$ , and $d lo g E_{w} ˙ / d lo g L_{bol} \sim 11/8$ . 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 $M_{BH} ≲ 1 0^{8} M_{⊙}$ exhibit the UFOs when $ε \sim 0.025$ . These predictions nicely agree with the X-ray observations (Gofford et al.). These results support that the line-driven disk wind is the origin of the UFOs.

8 pages, 6 figures, accepted for publication in MNRAS

Line-driven disk wind model for ultra-fast outflows in active galactic nuclei -- Scaling with luminosity

Abstract

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