On the Eddington limit for relativistic accretion discs
نویسندگان
چکیده
منابع مشابه
The runaway instability in general relativistic accretion discs
When an accretion disc falls prey to the runaway instability, a large portion of its mass is devoured by the black hole within a few dynamical times. Despite decades of effort, it is still unclear under what conditions such an instability can occur. The technically most advanced relativistic simulations to date were unable to find a clear sign for the onset of the instability. In this work, we ...
متن کاملRelativistic Variable Eddington Factor
We analytically derive a relativistic variable Eddington factor in the relativistic radiative flow, and found that the Eddington factor depends on the velocity gradient as well as the flow velocity. When the gaseous flow is accelerated and there is a velocity gradient, there also exists a density gradient. As a result, an unobstructed viewing range by a comoving observer, where the optical dept...
متن کاملThe Eddington Luminosity Limit for Multiphased Media
We consider the eeective Eddington luminosity in a locally inhomogeneous medium by averaging out the coarse, small scale behavior. We show that the ratio between the emitted ux and the average radiation force changes. The mean luminosity can therefore theoretically exceed the classical Eddington limit. It is further shown that acoustic modes are unstable under most relevant conditions, and they...
متن کاملCrossing 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 کاملCalculation of the relativistic bulk tensor and shear tensor of relativistic accretion flows in the Kerr metric.
In this paper, we calculate the relativistic bulk tensor and shear tensor of the relativistic accretion ows in the Kerr metric, overall and without any approximation. We obtain the relations of all components of the relativistic bulk and shear tensor in terms of components of four-velocity and its derivatives, Christoffel symbols and metric components in the BLF. Then, these components are deri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stv2229