Dust-driven wind as a model of Broad Absorption Line quasars

Abstract

We test a scenario claiming that the broad absorption line (BAL) phenomenon in quasars (QSOs) is not a temporary stage of their life. In this scenario, we see the BAL effect only if the line of sight is within a spatially limited and collimated massive outflow cone covering only a fraction of sky from the point of view of the nucleus. The aim is to understand the theoretical mechanism behind the massive outflow in BAL QSOs which is important for modelling the impact of quasars onto the star formation rate in the host galaxy, and, subsequently, onto the galaxy evolution. We apply the specific theoretical model of dust-driven wind. The model has considerable predictive power. The 2.5D version of FRADO model of Czerny & Hryniewicz gives rise to the formation of fast funnel-shaped outflow from the disk for a certain range of black hole masses, Eddington ratios and metallicities. We now interpret BAL QSO as sources viewed along the outflowing stream and we calculate the probabilities of seeing the BAL phenomenon as functions of these global parameters, and we compare these probabilities to those seen in the observational data. We include considerations on the presence/absence of obscuring torus. Comparing our theoretical results with observational data for a sample consisting of two sub-populations of BAL and non-BAL QSOs we found that both in the model and in the data the BAL phenomenon mostly happens for sources with black hole masses larger than 10^{8} solar mass, the effect get stronger with accretion rate, and also high metallicities are more likely in QSOs showing BAL features if the presence of torus is taken into account. The consistency of the model with the data provides support for the interpretation of the BAL phenomenon as the result of the orientation of the source. It also supports the underlying theoretical model although more consistency checks should be done in the future.

15 pages, 13 figures, 3 tables, Accepted for publication in the Journal of Astronomy and Astrophysics (A&A)

References in corpus (21)

• A Catalog of Quasar Properties from SDSS DR7
• AGN Dusty Tori: I. Handling of Clumpy Media
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• The Intrinsic Fraction of Broad Absorption Line Quasars
• Dust inflated accretion disc as the origin of the Broad Line Region in Active Galactic Nuclei
• The metallicity of the most distant quasars
• Widespread, strong outflows in XQR-30 quasars at the Reionisation epoch
• Failed radiatively Accelerated Dusty Outflow model of the Broad Line Region in Active Galactic Nuclei. I. Analytical solution
• Physical Conditions in Quasar Outflows: VLT Observations of QSO 2359-1241
• Full SED fitting with the KOSMA-τ PDR code - I. Dust modelling
• The dust origin of the Broad Line Region and the model consequences for AGN unification scheme
• Search for X-ray occultations in Active Galactic Nuclei
• Test of the Formation mechanism of the Broad Line Region in Active Galactic Nuclei
• The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$
• Discovery of a Remarkably Powerful Broad Absorption Line Quasar Outflow in SDSS J135246.37+423923.5
• High Metal Content of Highly Accreting Quasars: Analysis of an Extended Sample
• The Properties of Low-Redshift FeLoBAL Quasars: III. The Location and Geometry of the Outflows
• BLR size in Realistic FRADO Model: The role of shielding effect
• Connection between Emission and Absorption Outflows through the Study of Quasars with Extremely-High Velocity Outflows
• The Wind Dynamics of Super-Eddington Sources in FRADO
• Deep absorption in SDSS J110511.15+530806.5

Cited by in corpus (6)

• A disc wind model for blueshifts in quasar broad emission lines
• The SDSS-V Black Hole Mapper Reverberation Mapping Project: CIV BAL Acceleration in the Quasar SBS 1408+544
• Broad-line region in active galactic nuclei: Dusty or dustless?
• Application of the FRADO model of BLR formation to the Seyfert galaxy NGC 5548 and the first step toward determining the Hubble constant
• H$\beta$ line shape and radius-luminosity relation in 2.5D FRADO
• Discovery of the Asymmetric Effect in the Response of Photoionization Gas