THE EFFECTS OF IRRADIATION ON CLOUD EVOLUTION IN ACTIVE GALACTIC NUCLEI

@article{Proga2013THEEO,
  title={THE EFFECTS OF IRRADIATION ON CLOUD EVOLUTION IN ACTIVE GALACTIC NUCLEI},
  author={D. Proga and Yan-Fei Jiang and James M. Stone and Shane W. Davis and Daniel C. Smith},
  journal={The Astrophysical Journal},
  year={2013},
  volume={780}
}
We report on the first phase of a study of cloud irradiation. We study irradiation by means of numerical, two-dimensional, time-dependent radiation hydrodynamic simulations of a strongly irradiated cloud. We adopt a very simple treatment of the opacity, neglect photoionization and gravity, and focus instead on assessing the role of the type and magnitude of the opacity on the cloud evolution. Our main result is that even relatively dense clouds that are radiatively heated (i.e., with… 

Dusty Cloud Acceleration by Radiation Pressure in Rapidly Star-forming Galaxies

We perform two-dimensional and three-dimensional radiation hydrodynamic simulations to study cold clouds accelerated by radiation pressure on dust in the environment of rapidly star-forming galaxies

CLOUD FORMATION AND ACCELERATION IN A RADIATIVE ENVIRONMENT

In a radiatively heated and cooled medium, thermal instability (TI) is a plausible mechanism for forming clouds, while the radiation force provides a natural acceleration, especially when ions

Dusty Cloud Acceleration with Multiband Radiation

We perform two-dimensional and three-dimensional simulations of cold, dense clouds, which are accelerated by radiation pressure on dust relative to a hot, diffuse background gas. We examine the

On the dynamics of clouds in the broad-line region of AGNs with an ADAF atmosphere

We investigate orbital motion of spherical, pressure-confined clouds in the broad-line region (BLR) of active galactic nuclei (AGN). The combined influence of gravity of the central object and the

Effects of opacity temperature dependence on radiatively accelerated clouds

We study how different opacity–temperature scalings affect the dynamical evolution of irradiated gas clouds using time-dependent radiation-hydrodynamics simulations. When clouds are optically

Dynamics of dusty radiation-pressure-driven shells and clouds: fast outflows from galaxies, star clusters, massive stars, and AGN

It is typically assumed that radiation pressure driven winds are accelerated to an asymptotic velocity of V ~ v_esc, where v_esc is the escape velocity from the central source. We note that this is

LOCAL RADIATION HYDRODYNAMIC SIMULATIONS OF MASSIVE STAR ENVELOPES AT THE IRON OPACITY PEAK

We perform three-dimensional radiation hydrodynamic simulations of the structure and dynamics of the radiation-dominated envelopes of massive stars at the location of the iron opacity peak.

THERMAL AND RADIATIVE ACTIVE GALACTIC NUCLEUS FEEDBACK HAVE A LIMITED IMPACT ON STAR FORMATION IN HIGH-REDSHIFT GALAXIES

The effects of active galactic nuclei (AGNs) on their host galaxies depend on the coupling between the injected energy and the interstellar medium (ISM). Here, we model and quantify the impact of

On the evolution of gas clouds exposed to AGN radiation. I. Three-dimensional radiation hydrodynamic simulations

We perform three-dimensional radiation hydrodynamic simulations of uniform dusty gas clouds irradiated by an active galactic nucleus (AGN) to investigate the dependence of evolution of clouds on the

References

SHOWING 1-10 OF 39 REFERENCES

Structure and stability of quasar clouds

The structure of broad emission-line clouds is discussed, including radiative forces and dynamical pressure. A simplified model is developed for the radial variation of pressure and density and the

Stability of cloud orbits in the broad-line region of active galactic nuclei

We investigate the global dynamic stability of spherical clouds in the broad-line region (BLR) of active galactic nuclei (AGN), exposed to radial radiation pressure, gravity of the central black hole

The origin of broad emission line clouds in active galactic nuclei

Numerous arguments suggest that the broad emission lines characteristic of many types of active galactic nuclei are formed in comparatively cool clouds embedded in a much hotter medium of roughly

Magnetohydrodynamic stability of broad line region clouds

Hydrodynamic stability has been a longstanding issue for the cloud model of the broad line region in active galactic nuclei. We argue that the clouds may be gravitationally bound to the supermassive

The structure, shape, and evolution of radiatively accelerated QSO emission-line clouds

The possibility that the broad emission-line regions of QSOs and active galactic nuclei are formed by a multitude of small clouds which are radiatively accelerated is discussed. Although this model

Radiation Pressure and the Stability of Broad-Line Region Clouds

We discuss two constraints on the existence and stability of quasar emission-line gas. The case of a constant pressure photoionized cloud in pressure equilibrium with a surrounding hot gas is

The photoevaporation of interstellar clouds. II. Equilibrium cometary clouds

An approximate analytic theory for the evolution of an interstellar cloud which is exposed to the ionizing radiation of a newly formed star is developed. This paper will follow the evolution of a

Small Dense Broad-Line Regions in Active Nuclei

Recent observational studies indicate that the broad-line region (BLR) of AGN may be much smaller than previously thought. One consequence is that the flux of ionizing radiation is considerably

The role of radiative acceleration in outflows from broad absorption line QSOs. 1: Comparison with O star winds

We investigate the role of radiation pressure in accelerating the broad absorption line (BAL) outflows in QSOs by comparing their properties with those of radiatively driven O star winds. We find

Dynamics of Broad Emission-Line Region in NGC 5548: Hydromagnetic Wind Model versus Observations

We analyze the results of long-term observations of the broad-line region (BLR) in the Seyfert 1 galaxy NGC 5548 and provide a critical comparison with the predictions of a hydromagnetically driven