منابع مشابه
Crossing the Eddington Limit: Examining Disk Spectra at High Accretion Rates
The faintest ultraluminous X-ray sources (ULXs), those with 0.3–10 keV luminosities 1 < LX/10 39 < 3 erg s, tend to have X-ray spectra that are disk-like but broader than expected for thin accretion disks. These ‘broadened disk’ spectra are thought to indicate nearor mildly super-Eddington accretion onto stellar remnant black holes. Here we report that a sample of bright thermal-dominant black ...
متن کاملSuper-eddington Accretion in Grs 1915+105
Classical modelling suggests that, during the RXTE observations studied, GRS 1915+105 was near or above the critical accretion rate and the optically thick inner disk penetrated inside the advection-dominated flow. The system was very unstable leading to a rich pattern of variability , e.g. the rings which might be characteristic to disk instabilities very close to the innermost stable orbit. S...
متن کاملModelling magnetised accretion discs
Some recent results are reviewed that lead us now to believe that accretion discs are basically always magnetised. The main components are Balbus-Hawley and Parker instabilities on the one hand and a dynamo process on the other. A mechanical model for the Balbus-Hawley instability is presented and analysed quantitatively. Three-dimensional simulations are discussed, especially the resulting mag...
متن کاملSelf-gravitating accretion discs
— I review recent progresses in the dynamics and the evolution of self-gravitating accretion discs. Accretion discs are a fundamental component of several astrophysical systems on very diverse scales, and can be found around supermassive black holes in Active Galactic Nuclei (AGN), and also in our Galaxy around stellar mass compact objects and around young stars. Notwithstanding the specific di...
متن کاملSpiral waves in accretion discs
In the first part of this article, we review the observational evidence for spirals in the accretion discs of cataclysmic variables. It is shown that with the increasing amount of data available, spirals appear to be an omnipresent feature of accretion discs in outburst. Spirals seem to live until decline that is, for several tens of orbital periods. We then study the formation of spiral shocks...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2007
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2006.11233.x