Recent Comments

    black holes tagged posts

    Black hole size revealed by its eating pattern

    August 13, 2021, Categories  Uncategorized

    An artist’s impression of an accretion disk rotating around an unseen supermassive black hole. The accretion process produces random fluctuations in luminosity from the disk over time, a pattern found to be related to the mass of the black hole in a new study led by University of Illinois Urbana-Champaign researchers.
    Graphic courtesy Mark A. Garlick/Simons Foundation

    The feeding patterns of black holes offer insight into their size, researchers report. A new study revealed that the flickering in the brightness observed in actively feeding supermassive black holes is related to their mass.

    Supermassive black holes are millions to billions of times more massive than the sun and usually reside at the center of massive galaxies...

    Read More

    A new theory for how Black Holes and Neutron Stars Shine Bright

    December 2, 2019, Categories  Astronomy/Space

    Here, a massive super-computer simulation shows the strong particle density fluctuations that occur in the extreme turbulent environments that host black holes and neutron stars. Dark blue regions are low particle density regions, while yellow regions are strongly over-dense regions. Particles are accelerated to extremely high speeds due to the interactions with strongly turbulence fluctuations in this environment. Credit: Image from published study

    Astrophysicists employed massive super-computer simulations to calculate the mechanisms that accelerate charged particles in extreme environments. They concluded their energization is powered by the interplay of chaotic motion and reconnection of super-strong magnetic fields.

    For decades, scientists have speculated about the origin of ...

    Read More

    Telescopes in Space for even Sharper Images of Black Holes

    May 7, 2019, Categories  Astronomy/Space

    In space, the EHI has a resolution more than five times that of the EHT on Earth, and images can be reconstructed with higher fidelity. Top left: Model of Sagittarius A* at an observation frequency of 230 GHz. Top left: Simulation of an image of this model with the EHT. Bottom left: Model of Sagittarius A* at an observation frequency of 690 GHz. Bottom right: Simulation of an image of this model with the EHI.
    Credit: F. Roelofs and M. Moscibrodzka, Radboud University

    Astronomers propose placing two or three satellites in circular orbit around the Earth to observe black holes. Astronomers have just managed to take the first image of a black hole, and now the next challenge facing them is how to take even sharper images, so that Einstein’s Theory of General Relativity can be tested...

    Read More

    Black Holes from an Exacomputer

    May 30, 2018, Categories  Physics, Technology/Electronics

    Black Holes From an Exacomputer

    Time evolution of the contour surfaces of the lapse α and the shift vector βi for the head-on collision of two puncture black holes of equal mass M=1 at times t=0,5,7,8,10M and t=15M, from top left to bottom right. Phys. Rev. D 97, 084053, 2018; doi:10.1103/PhysRevD.97.084053

    Scientists develop simulation code for new generation of supercomputers. What happens when two black holes merge, or when stars collide with a black hole? This has now been simulated using a novel numerical method. The simulation code ‘ExaHyPE’ is designed in such a way that it will be able to calculate gravitational waves on the future generation of ‘exascale’ supercomputers.

    The challenge in simulating black holes lies in the necessity of solving the complex Einstein system of equations...

    Read More