Zobrazeno 1 - 10
of 130
pro vyhledávání: '"Everett, J E"'
Thermal mid-infrared emission of quasars requires an obscuring structure that can be modeled as a magneto-hydrodynamic wind in which radiation pressure on dust shapes the outflow. We have taken the dusty wind models presented by Keating and collabora
Externí odkaz:
http://arxiv.org/abs/1505.04219
Mass ejection in the form of winds or jets appears to be as fundamental to quasar activity as accretion, and can be directly observed in many objects with broadened and blue-shifted UV absorption features. A convincing argument for radiation pressure
Externí odkaz:
http://arxiv.org/abs/1303.7142
An integral part of the Unified Model for Active Galactic Nuclei (AGNs) is an axisymmetric obscuring medium, which is commonly depicted as a torus of gas and dust surrounding the central engine. However, a robust, dynamical model of the torus is requ
Externí odkaz:
http://arxiv.org/abs/1202.4681
The blue-shifted broad emission lines and/or broad absorption lines seen in many luminous quasars are striking evidence for a broad line region in which radiation driving plays an important role. We consider the case for a similar role for radiation
Externí odkaz:
http://arxiv.org/abs/1201.5018
Autor:
Gallagher, S. C., Everett, J. E.
Quasars are notable for the luminous power they emit across decades in frequency from the far-infrared through hard X-rays; emission at different frequencies emerges from physical scales ranging from AUs to parsecs. Each wavelength regime thus offers
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701076
Publikováno v:
Astrophys.J.639:740-752,2006
As a result of deep hard X-ray observations by Chandra and XMM-Newton a significant fraction of the cosmic X-ray background (CXRB) has been resolved into individual sources. These objects are almost all active galactic nuclei (AGN) and optical follow
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509356
Autor:
Ballantyne, D. R., Everett, J. E.
Publikováno v:
Astrophys.J. 626 (2005) 364-372
Type I X-ray bursts and superbursts on neutron stars release sudden and intense radiation fields into their surroundings. Here, we consider the possible effects of these powerful explosions on the structure of the accretion disk. The goal is to accou
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502463
Autor:
Everett, J. E., Ballantyne, D. R.
Publikováno v:
Astrophys.J. 615 (2004) L13-L16
Motivated by recent observations of high-velocity, highly ionized winds in several QSOs, models of purely continuum-driven winds launched from approximately 200 GM_{BH}/c^2 are presented. Launching conditions are investigated, as well as the observat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409409
Spectral absorption features in active galactic nuclei (AGNs) have traditionally been attributed to outflowing photoionized gas located at a distance of order a parsec from the central continuum source. However, recent observations of QSO FIRST J1044
Externí odkaz:
http://arxiv.org/abs/astro-ph/0201268
We present a self-consistent, semi-analytical dynamical model of disk driven outflows in AGNs that are accelerated by a combination of magnetic stresses and radiation pressure. This model will make it possible to examine scenarios in which the wind i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0010246