A Hybrid Two Component Accretion Flow Surrounding Supermassive Black Holes in AGN

@article{Liu2015AHT,
  title={A Hybrid Two Component Accretion Flow Surrounding Supermassive Black Holes in AGN},
  author={B. F. Liu and R. E.Taam and Erlin Qiao and Weimin Yuan},
  journal={arXiv: High Energy Astrophysical Phenomena},
  year={2015}
}
It is commonly believed that the optical/UV and X-ray emissions in luminous AGN are produced in an accretion disk and an embedded hot corona respectively. The inverse Compton scattering of disk photons by hot electrons in the corona can effectively cool the coronal gas if the mass supply is predominantly via a cool disk like flow as in BHXRBs. Thus, the application of such a model to AGNs fails to produce their observed X-ray emission. As a consequence, a fraction of disk accretion energy is… 

Figures from this paper

Centrally Concentrated X-ray Radiation from an Extended Accreting Corona in Active Galactic Nuclei
The X-ray emission from bright active galactic nuclei (AGNs) is believed to originate in a hot corona lying above a cold, geometrically thin accretion disk. A highly concentrated corona located
Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei
Context. Accretion flows toward black holes can be of a quite different nature, described as an optically thick cool gas flow in a disk for high accretion rates or as a hot coronal optically thin gas
Corona-heated Accretion-disk Reprocessing: A Physical Model to Decipher the Melody of AGN UV/Optical Twinkling
Active galactic nuclei (AGNs) have long been observed to "twinkle" (i.e., their brightness varies with time) on timescales from days to years in the UV/optical bands. Such AGN UV/optical variability
Wind accretion in Cygnus X-1
Context. Cygnus X-1 is a black hole X-ray binary system in which the black hole captures and accretes gas from the strong stellar wind emitted by its supergiant O9.7 companion star. The irradiation
BAT AGN Spectroscopic Survey – XII. The relation between coronal properties of active galactic nuclei and the Eddington ratio
  • C. Ricci, L. Ho, +12 authors K. Oh
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2018
The bulk of the X-ray emission in active galactic nuclei (AGNs) is produced very close to the accreting supermassive black hole (SMBH), in a corona of hot electrons which up scatters optical and
Radiation Characteristics of Two-Component Accretion Flow Paradigm Around Black Holes
We discuss different radiation processes in a general (23 flow) accretion disk around a black hole and present the radiation spectra. The spectrum calculation includes a hybrid flow due to
Revisiting the structure and spectrum of the magnetic-reconnection-heated corona in luminous AGNs
It is believed that the hard X-ray emission in the luminous active galactic nuclei (AGNs) is from the hot corona above the cool accretion disk. However, the formation of the corona is still debated.
Accretion around black holes: The geometry and spectra
TLDR
The accretion flows around black holes are reviewed, with an emphasis on the physics that determines the configuration of hot and cold accreting gas, and how the configuration varies with the accretion rate and thereby produces various luminosity and spectra.
A Model for Spectral States and Their Transition in Cyg X-1
A new accretion picture based on a small disk surrounding a black hole is developed for the wind-fed source Cyg X-1. The hard and soft spectral states of Cyg X-1 are interpreted in terms of
Modelling accretion disc emission with generalized temperature profile and its effect on AGN spectral energy distribution
The broadband spectral energy distribution (SED) of Active Galactic Nuclei (AGN) is investigated for a well-selected sample composed of $23$ Seyfert 1 galaxies observed simultaneously in the
...
1
2
...

References

SHOWING 1-10 OF 60 REFERENCES
Coronae above accretion disks around black holes: the effect of Compton cooling
Context. The geometry of the accretion flow around stellar mass and sup ermassive black holes depends on the accretion rate. Broad iron emission lines originating from the irradiation of coo l matter
STATE TRANSITIONS IN LOW-MASS X-RAY BINARIES
We investigate the model of disk/coronal accretion into a black hole. We show that the inner regions of an accretion disk in X-ray binaries can transform from a cool standard disk to an
Accretion discs with accreting coronae in active galactic nuclei – II. The nuclear wind
We study an accretion disc with a hot continuous corona. We assume that the corona itself accretes and therefore it is powered directly by the release of the gravitational energy and cooled by
On the Properties of Inner Cool Disks in the Hard State of Black Hole X-Ray Transient Systems
We investigate the formation of cool disks in the innermost regions of black hole X-ray transient systems in the low/hard state. Taking into account the combined cooling associated with the Compton
Two-temperature coronal flow above a thin disk
We extended the disk corona model to the inner region of galactic nuclei by including different temperatures in ions and electrons as well as Compton cooling. We found that the mass evaporation rate,
THE STRUCTURE AND SPECTRAL FEATURES OF A THIN DISK AND EVAPORATION-FED CORONA IN HIGH-LUMINOSITY ACTIVE GALACTIC NUCLEI
We investigate the accretion process in high-luminosity active galactic nuclei (HLAGNs) in the scenario of the disk evaporation model. Based on this model, the thin disk can extend down to the
Hot Accretion Flows Around Black Holes
Black hole accretion flows can be divided into two broad classes: cold and hot. Whereas cold accretion flows consist of cool optically thick gas and are found at relatively high mass accretion rates,
Re-condensation from an ADAF into an inner disk: the intermediate state of black hole accretion?
Context. Accretion onto galactic and supermassive black holes occurs in different modes, which are documented in hard and soft spectral states, commonly attributed to an advection-dominated flow
A Simple Model for a Magnetic Reconnection-heated Corona
We construct a simple model for a magnetic reconnection-heated corona above a thin accretion disk in active galactic nuclei (AGNs) and Galactic black hole candidates (GBHCs). The basic assumptions
An accretion disc-corona model for X-ray spectra of active galactic nuclei
The hard X-ray emission of active galactic nuclei (AGN) is believed to originate from the hot coronae above the cold accretion discs. The hard X-ray spectral index is found to be correlated with the
...
1
2
3
4
5
...