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Slim Disks with Transition Regions and Applications to Microquasars and Narrow Line Seyfert 1 Galaxies | | Lin-Hong Chen
; Jian-Min Wang
; | | Date: |
7 Jul 2004 | | Journal: | Astrophys.J. 614 (2004) 101-114 | | Subject: | astro-ph | | Abstract: | Slim disks have been received much attention because of the increasing evidence for the super-critical accreting objects. In this paper, we make an attempt to construct a unified model, in which the viscosity and the dimensionless accretion rate can span rather wide ranges. We replace blackbody radiation under diffusion approximation with a bridged formula, which accounts for both blackbody radiation and thermal bremsstrahlung in optically-thick and -thin cases, respectively. Thus this allows us to investigate the structures of and the emergent spectra from slim disks in a wider parameter space, covering transition regions from optically thick to optically thin. We show that there is a maximum transition radius, roughly $R_{
m tr, max}/R_gsim 50$ when $dot{M}/dot{M}_{
m C}sim 15$. The emergent spectra from the unified model of the accretion disk have been calculated. A simple model of hot corona above the slim disk is taken into account for the hard X-ray spectrum in this paper based on Wang & Netzer (2003). We have applied the present model to the microquasar GRS 1915+105, narrow line Seyfert 1 galaxies RE J1034+396 and Akn 564. Our model can explain well the broadband X-ray spectra of narrow line Seyfert 1 galaxies, microquasars and possible ultra-luminous compact X-ray sources. The present model can be widely applied to the candidates of super-critical accreting objects. | | Source: | arXiv, astro-ph/0407125 | | Services: | Forum | Review | PDF | Favorites | |
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