High-Redshift Radio-quiet Quasars: Exploring the Parameter Space of Accretion Models. II. Patchy Corona Model

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...

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Bibliographic Details
Published in:The Astrophysical journal 2004-12, Vol.617 (1), p.102-112
Main Authors: Sobolewska, MaŁgorzata A, Siemiginowska, Aneta, Życki, Piotr T
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Quasars
Quasars. Active or peculiar galaxies, objects, and systems
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary: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-kT sub(e) low-t to low-kT sub(e) high-t 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 10 super(10) M sub( ), and the accretion rate is M . 0.2 M sub(Edd). We compare our results with those obtained previously for a hot inner flow geometry.
ISSN:0004-637X
1538-4357
DOI:10.1086/425262