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Titolo: Emergent spectra from slim accretion disks in active galactic nuclei
Autore: Wang, JM; Szuszkiewicz, E; Lu, FJ;
- Indirizzi:
- Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China Beijing Normal Univ Beijing Peoples R China 100875 0875, Peoples R China Chinese Acad Sci, Inst High Energy Phys, Lab Cosm Ray & High Energy Astrophys, Beijing 100039, Peoples R China Chinese Acad Sci Beijing Peoples R China 100039 100039, Peoples R China Beijing Univ, Chinese Acad Sci, Joint Beijing Astrophys Ctr, Beijing 100871, Peoples R China Beijing Univ Beijing Peoples R China 100871 jing 100871, Peoples R China Univ Leicester, Dept Phys, Astron Grp, Leicester LE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH er LE1 7RH, Leics, England Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China Univ Sci & Technol China Hefei Peoples R China 230026 6, Peoples R China
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 2,
volume: 522,
anno: 1999,
parte:, 1
pagine: 839 - 845
- SICI:
- 0004-637X(19990910)522:2<839:ESFSAD>2.0.ZU;2-2
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- ULTRAVIOLET EXCESS; BLACK-HOLES; OBSERVATIONAL APPEARANCE; SEYFERT-1 GALAXIES; VERTICAL STRUCTURE; QUASARS; MODELS; CONTINUUM; BUMP; DISTRIBUTIONS;
- Keywords:
- accretion, accretion disks; galaxies : active; galaxies : kinematics and dynamics;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 49
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Wang, JM Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R ChinaBeijing Normal Univ Beijing Peoples R China 100875 ples R China
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- Citazione:
- J.M. Wang et al., "Emergent spectra from slim accretion disks in active galactic nuclei", ASTROPHYS J, 522(2), 1999, pp. 839-845
Abstract
Recently the vertical structure of accretion disks has received much attention because of the available comparison with observations of the big blue bump, but all the calculations are based on the standard accretion disk model. In this paper we calculate the vertical structure and the emergent spectrum based on the radial structure of slim disks from the height-averaged equations. With the a-prescription of energy generation, we obtain the density profile as a Gaussian distribution, then solve the energy transfer problem in the z-direction. We find that the sub-Keplerian rotation affects the density profile in the z-direction. The advection process plays significantroles in the emergent spectrum, especially for high accretion rates. We show that there are two prominent characteristics of the spectrum: the presence of a maximum frequency in the emergent spectrum, which is very weakly dependent on the accretion rate, and a flattened component. These results arebeyond the scope of explanation of the standard model of accretion disks even for the model with the modified blackbody spectrum. The present model is suitable for a wide range of disk parameters.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/06/13 alle ore 19:44:55