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Escape probability methods versus 'exact' transfer for modelling the X-ray spectrum of Active Galactic Nuclei and X-ray binaries

Autor: Dumont, A-M., Collin, S., Paletou, F., Coupé, S., Godet, O., Pelat, D.

Publikováno v: Astron.Astrophys. 407 (2003) 13-30

In the era of XMM-Newton and Chandra missions, it is crucial to use codes able to compute correctly the line spectrum of X-ray irradiated thick media (Thomson thickness of the order of unity) to build models for the structure and the emission of the

Externí odkaz: http://arxiv.org/abs/astro-ph/0306297

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Evolution of the X-ray spectrum in the flare model of Active Galactic Nuclei

Autor: Collin, S., Coupé, S., Dumont, A-M., Petrucci, P-O., Różańska, A.

Publikováno v: Astron.Astrophys. 400 (2003) 437-450

Nayakshin & Kazanas (2002) have considered the time-dependent illumination of an accretion disc in Active Galactic Nuclei, in the lamppost model. We extend their study to the flare model, which postulates the release of a large X-ray flux above a sma

Externí odkaz: http://arxiv.org/abs/astro-ph/0212528

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Near IR Spectroscopy of Active Galactic Nuclei

Autor: Boisson, C., Coupe, S., Cuby, J. G., Joly, M., Ward, M. J.

Publikováno v: Astron.Astrophys. 396 (2002) 489-502

Using the VLT together with the near infrared instrument ISAAC, we have obtained medium spectral and high spatial resolution observations of a sample of nearby Seyfert galaxies in the H-band. This band is particularly suited for stellar population st

Externí odkaz: http://arxiv.org/abs/astro-ph/0211453

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Are quasars accreting at super-Eddington rates?

Autor: Collin, S., Boisson, C., Mouchet, M., Dumont, A-M., Coupé, S., Porquet, D., Rokaki, E.

In a previous paper, Collin & Hur\'e (2001), using a sample of Active Galactic Nuclei (AGN) where the mass has been determined by reverberation studies (Kaspi et al. 2000), have shown that if the optical luminosity is emitted by a steady accretion di

Externí odkaz: http://arxiv.org/abs/astro-ph/0203439

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Models for the UV-X emission in AGN : influence of different parameters

Autor: Coupé, S., Artru, M-C., Collin, S., Czerny, B., Dumont, A-M.

We present the results of computations performed with a new photoionisation-transfer code designed for hot Compton thick media. Presently the code solves the transfer of the continuum with the Accelerated Lambda Iteration method (ALI) and that of the

Externí odkaz: http://arxiv.org/abs/astro-ph/0110055

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