Dynamics of Line‐driven Disk Winds in Active Galactic Nuclei

Proga, Daniel; Stone, James M.; Kallman, T. R.

doi:10.1086/317154

Cited by 862 publications

(1,051 citation statements)

References 48 publications

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“…Time-dependent self-similar ADAF solutions by Ogilvie (1999), that differ from the stationary self-similar solution of Narayan & Yi (1994), appear to be consistent with this result. At high luminosities, outflows can also be driven directly by radiation pressure, particularly with the high atomic opacities expected for gas around supermassive black holes in active galactic nuclei (Murray et al 1995;Proga, Stone & Kallman 2000).…”

Section: Other Variantsmentioning

confidence: 99%

General Overview of Black Hole Accretion Theory

Blaes

2013

Space Sci Rev

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I provide a broad overview of the basic theoretical paradigms of black hole accretion flows. Models that make contact with observations continue to be mostly based on the four decade old alpha stress prescription of Shakura & Sunyaev (1973), and I discuss the properties of both radiatively efficient and inefficient models, including their local properties, their expected stability to secular perturbations, and how they might be tied together in global flow geometries. The alpha stress is a prescription for turbulence, for which the only existing plausible candidate is that which develops from the magnetorotational instability (MRI). I therefore also review what is currently known about the local properties of such turbulence, and the physical issues that have been elucidated and that remain uncertain that are relevant for the various alpha-based black hole accretion flow models.

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Section: Other Variantsmentioning

confidence: 99%

General Overview of Black Hole Accretion Theory

Blaes

2013

Space Sci Rev

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“…This redshift is not expected if there is an outflow in the BLR. But let us recall the results obtained in the study of dynamics of the line-driven diskwind, where the kinematics of the gas show that both infall and outflow can occur in different regions of the wind at the same time (see Proga et al 1998Proga et al , 2000, which depends on radiation force. Also, recently Gaskell (2009) reported the possibility that an inflow is present in the BLR of AGN.…”

Section: Variability and The Blr Structure Of 3c 3903mentioning

confidence: 99%

Spectral optical monitoring of 3C 390.3 in 1995–2007

Popovic

Shapovalova

Ilić

et al. 2011

A&A

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Context. We present a study of the variability of the broad emission-line parameters of 3C390.3, an active galaxy with the doublepeaked emission-line profiles. We give a detailed analysis of the variation in the broad Hα and Hβ emission-line profiles, the ratios, and the Balmer decrement of different line segments. Aims. We explore the disk structure with an investigation of the variability of the broad-line profiles. This is assumed to emit the broad double-peaked Hβ and Hα emission lines in the spectrum of 3C390.3. Methods. We divided the observed spectra into two periods (before and after the outburst in 2002) and separately analyzed the variation in these two periods. First we analyzed the spectral emission-line profiles of the Hα and Hβ lines and measured the peak positions. Then, we divided the lines into several segments and measured the line-segment fluxes. The Balmer decrement variation for the entire Hα and Hβ fluxes and for the line segments was investigated and discussed. Additionally, we modeled the variations in the line parameters with an accretion disk model and compared our modeled line parameter variations with observed ones. Results. We compared the variability in the observed line parameters with the disk model predictions and found that the variation in line profiles and in the line segments corresponds to the emission of a disk-like broad-line region (BLR). But there is probably another additional emission component that contributes to the Hα and Hβ line center. We found that the variation in the line profiles is caused by the variation in the parameters of the disk-like BLR, first of all in the inner (outer) radius, which can well explain the line parameters variations in Period I. The Balmer decrement across the line profile has a bell-like shape and is affected not only by physical processes in the disk, but also by different emitting disk dimension of the Hα and Hβ line. Conclusions. The geometry of the BLR of 3C390.3 seems to be very complex, and inflows/outflows may be present, but evidently the broad-line region with its disk-like geometry is the dominant emitter.

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“…Proga et al 2000;Murray et al 1995;Filiz Ak et al 2013). There exists an empirical relation between the BLR size and the continuum luminosity in AGN/QSOs (e.g.…”

Section: Introductionmentioning

confidence: 99%

Variability of QSOs with variable regions in broad absorption troughs from the Sloan Digital Sky Survey

He¹,

Bian²,

Ge³

et al. 2015

Mon. Not. R. Astron. Soc.

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The variability of broad absorption lines is investigated for a sample of 188 broad-absorptionline (BAL) quasars (QSOs) (z > 1.7) with at least two-epoch observations from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7), covering a time-scale of about 0.001 -3 years in the rest frame. Considering only the longest time-scale between epochs for each QSO, 73 variable regions in the C IV BAL troughs are detected for 43 BAL QSOs. The proportion of BAL QSOs showing variable regions increases with longer time-interval than about 1 year in the rest frame. The velocity width of variable regions is narrow compared to the BALtrough outflow velocity. For 43 BAL QSOs with variable regions, it is found that there is a medium strong correlation between the variation of the continuum luminosity at 1500 Å and the variation of the spectral index. With respect to the total 188 QSOs, larger proportion of BAL QSOs with variable regions appears bluer during their brighter phases, which implies that the origin of BAL variable regions is related to the central accretion process. For 43 BAL QSOs with variable regions, it is possible that there is a negative medium strong correlation between the absolute variation of the equivalent width and the Mg II -based black hole mass, and a medium strong correlation between the maximum outflow velocity of variable regions and the Eddington ratio. These results imply the connection between the BAL-trough variation and the central accretion process.

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Dynamics of Line‐driven Disk Winds in Active Galactic Nuclei

Cited by 862 publications

References 48 publications

General Overview of Black Hole Accretion Theory

General Overview of Black Hole Accretion Theory

Spectral optical monitoring of 3C 390.3 in 1995–2007

Variability of QSOs with variable regions in broad absorption troughs from the Sloan Digital Sky Survey

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