Black holes were predicted long before the beginning of the space age; they were perceived as by-products of mathematical theories, existed only in the imagination of a few scientists. The idea of "dark stars" (
Accretion DiskSingularitiesBlack Hole PhysicsQuintessenceIt is well known that quantum effects may lead to remove the intrinsic singularity point of back holes. Also, the quintessence scalar field is a candidate model for describing late-time acceleration expansion. Accordingly, Kazakov and Solodukhin ...
Several theories have been proposed to describe the formation of black hole seeds in the early Universe and to explain the emergence of very massive black holes observed in the first thousand million years after the Big Bang1,2,3. Models consider different seeding and accretion scenarios4,5,6,...
Black holes are big. Very big. But physics makes it almost impossible for them to grow. Here’s how one black hole defied the odds to swell to gargantuan proportions.
which demonstrates that modern all-sky surveys have much to reveal. The black hole in this quasar accretes around one solar mass per day onto an existing mass of∼17 billion solar masses. In this process, the accretion disk alone releases a radiative energy of 2 × 1041 W. If th...
关键词: Accretion Accretion Disks Black Hole Physics Galaxies: Individual: NGC Number: NGC 2300 Galaxies: Individual: NGC Number: NGC 1399 Galaxies: Individual: NGC Number: NGC 4278 Galaxies: Individual: NGC Number: NGC 4594 Galaxies: Nuclei Radio Continuum: Galaxies 被引量: 68 ...
But before we look at these, we first explain the ‘black hole balance problem’ in more detail. In Newtonian physics, a configuration of several extended bodies separated by a plane clearly cannot be in equilibrium.2 Even if all bodies are initially at rest, they will accelerate towards the...
We then discuss Van den Heuvel's “Hercules X-1 scenario” for forming low-mass X-ray binaries, commenting on the differences in accretion onto the compact object by radiative or semiconvective donors, rather than the deeply convective donors used in the earlier part of our review. In ...
These arguments make black holes one of the most challenging objects to study. As apparent by the images of supermassive black holes the thermodynamic states of such compact objects strongly depend on their surrounding environment. For example, this could be achieved by matter accretion onto the ...
3 Continuum spectrum from the accretion disk in a stationary, axisymmetric spacetime The continuum spectrum emitted by the accretion disk sur- rounding a black hole is sensitive to the background space- time and the properties of the accretion flow. Therefore it serves as an important astrophysical...