A new model for the Warm Absorber in NGC 3783: a single medium in total pressure equilibrium

@article{Gonalves2006ANM,
  title={A new model for the Warm Absorber in NGC 3783: a single medium in total pressure equilibrium},
  author={Anabela C. Gonçalves and Suzy Collin and A-M. Dumont and Martine Mouchet and Agata R{\'o}żańska and L. Chevallier and Royal Observatory and France Astronomical Observatory and Portugal APCParis 7 University and France Camk and Poland},
  journal={Astronomy and Astrophysics},
  year={2006},
  volume={451}
}
Context. Many active galactic nuclei exhibit X-ray features typical of the highly ionized gas called “Warm Absorber” (WA). Such a material appears to be stratified, displaying zones of di fferent density, temperature, and ionization. In this paper, we investigate the possibility of modelling the WA gas in NGC 3783 as a single medium in total pressure equilibrium. Aims. Our goal is to demonstrate that the WA can be well modelled assuming constant total pressure, in contrast to the current de… 

Figures from this paper

Thermal instability in X-ray photoionized media in Active Galactic Nuclei: Influence on the gas st
Context. A photoionized gas in thermal equilibrium can display a thermal instability, with three or more solutions in the multi-branch region of the S-shape curve that gives the temperature versus
The thermal instability of the warm absorber in NGC 3783
We model the observed X-ray spectral continuum shape, ionic column densities, and absorption measure distribution (AMD) of the warm absorber in the Seyfert galaxy NGC 3783. We assume a photo-ionized
Thermal instability in X-ray photoionized media in active galactic nuclei. II. Role of the thermal c
Context. A photoionized gas under constant pressure can display thermal instability with three or more solutions for possible thermal equilibrium. A unique solution of the structure of the irradiated
How to estimate the distance to the warm absorber in AGN from photoionized models
Aims. We present a method that allows us to estimate the distance from the continuum source located in the center of AGN to the highly ionized gas called warm absorber. Methods. We computed a set of
Response of the warm absorber cloud to a variable nuclear flux in active galactic nuclei
Recent modeling of the warm absorber in active galactic nuclei has proved the usefulness of constant total (gas plus radi ation) pressure models, which are highly stratified in temperature and
On the warm absorber in AGN outflow
Warm absorber (WA) is an ionised gas present in the line of sight to the AGN central engine. The effect of the absorber is imprinted in the absorption lines observed in X-ray spectra of AGN. In this
Magnetized Disk Winds in NGC 3783
We analyze a 900-ks stacked Chandra/HETG spectrum of NGC 3783 in the context of magnetically-driven accretion-disk wind models in an effort to provide tight constraints on the global conditions of
Thermally driven wind as the origin of warm absorbers in AGN
Warm absorbers are present in many active galactic nuclei (AGN), seen as mildly ionized gas outflowing with velocities of a few hundred to a few thousand kilometres per second. These slow
Absorption measure distribution of the outflow in iras 13349+2438 : Direct observation of thermal instability?
We analyze the Chandra X-ray spectrum, obtained with the HETGS grating spectrometer, of IRAS 13349+2438, which has one of the richest absorption spectra of a quasar outflow. Absorption from almost
Joint Fit of Warm Absorbers in COS & HETG Spectra of NGC 3783
Warm Absorbers (WAs), as an important form of AGN outflows, show absorption in both UV and X-ray band. Using XSTAR generated photoionization models, for the first time we present a joint fit to the
...
...

References

SHOWING 1-10 OF 22 REFERENCES
Toward a Self-Consistent Model of the Ionized Absorber in NGC 3783
We present a detailed model for the ionized absorbing gas evident in the 900 ks Chandra HETGS spectrum of NGC 3783. The analysis was carried out with PHASE, a new tool designed to model X-ray and UV
Dynamical and Spectral Modeling of the Ionized Gas and Nuclear Environment in NGC 3783
We present a new approach for calculating the physical properties of highly ionized X-ray flows in active galactic nuclei. Our method relies on a detailed treatment of the structure, dynamics, and
Warm Absorbers in Active Galactic Nuclei: A Multitemperature Wind
Although soft X-ray absorption features in AGNs were discovered almost ten years ago, the nature and location of the gas creating them has remained controversial. Guided by the results of recent
The Ionized Gas and Nuclear Environment in NGC 3783. IV. Variability and Modeling of the 900 Kilosecond Chandra Spectrum
We present a detailed spectral analysis of the data obtained from NGC 3783 during the period 2000-2001 using Chandra. The data were split in various ways to look for time- and luminosity-dependent
Two-phase models of quasar emission line regions
Previous studies of quasaremission line regions have established that the emitting gas as in clouds occupying a small fraction of the available volume and have suggested that these clouds are
Reprocessing of x-rays in agn. I. plane parallel geometry - test of pressure equilibrium
We present a model of the vertical stratication and the spectra of an irradiated medium under the assumption of constant pressure. Such a solution has properties intermediate between constant density
The recent history of the X‐ray absorber in NGC 3516
We present two BeppoSAX observations of the bright Seyfert 1 galaxy NGC 3516, performed four months apart (late 1996–early 1997). The earlier spectrum is considerably weaker and harder in the whole
A new type of photoionized code required for the new era of X-ray spectroscopy
With the advent of the present and future spatial X-ray missions, it becomes crucial to model correctly the line spectrum of X-ray emitting media such as the photoionized plasma observed in the
The role of absorption and reflection in the soft X-ray excess of active galactic nuclei. I. Preliminary results
The 2-10 keV continuum of AGN is well represented by a single power law, generally attributed to a hot comptonizing medium, such as a corona above the accretion disk. At smaller energies the
The structure and radiation spectra of illuminated accretion discs in active galactic nuclei – I. Moderate illumination
We present detailed computations of the vertical structure of an accretion disc illuminated by hard X-ray radiation with the code titan-noar, which is suitable for Compton-thick media. The energy
...
...