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High-redshift radio-quiet quasars: Exploring the parameter space of accretion models. II. Patchy corona model

Sobolewska, M.A.; Siemiginowska, A.; Zycki, P.T.

Authors

M.A. Sobolewska

A. Siemiginowska

P.T. Zycki



Abstract

We modeled the spectral energy distribution of high-redshift radio-quiet quasars (high-z RQQs). We computed spectra in a patchy corona geometry in which an accretion disk extends to the last stable orbit and the Comptonizing active regions (hot clouds) are distributed above the disk. We explored the model parameter space to find theoretical parameters that give spectra with an optical/UV luminosity, X-ray loudness, and X-ray photon index compatible with those of high-z RQQs observed with Chandra. We found that a range of solutions is possible, from high-kTe low- to low-kTe high- models. The solutions require a low level of energy dissipation in the hot clouds and a low disk covering factor. The modeled mass is on the order of 1010 M, and the accretion rate is ˙M 0:2 ˙MEdd. We compare our results with those obtained previously for a hot inner flow geometry.

Citation

Sobolewska, M., Siemiginowska, A., & Zycki, P. (2004). High-redshift radio-quiet quasars: Exploring the parameter space of accretion models. II. Patchy corona model. Astrophysical Journal, 617(1), 102-112. https://doi.org/10.1086/425262

Journal Article Type Article
Publication Date 2004-12
Deposit Date May 20, 2008
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 617
Issue 1
Pages 102-112
DOI https://doi.org/10.1086/425262
Keywords Accretion disks, Galaxies, High-redshift, Quasars, X-rays.

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