Results 131 to 140 of about 2,382,221 (211)

How a Klein–Nishina Modified Eddington-limited Accretion Explains Rapid Black Hole Growth in the Early Universe

The Astrophysical Journal
The discovery of quasars and their supermassive black holes (SMBHs) over 10 ^9 ${M}_{{\rm{\odot }}}$ merely hundreds of millions of years after the Big Bang generates tension with the idea of Eddington-limited accretion and pressures the community into ...
Jackson Frangos, Erick Rosen, Michael Williams, Chandra B. Singh, David Garofalo   +4 more
doaj   +1 more source

Supermassive black holes : the local supermassive black hole mass function

, 2012
Over recent years there has been an increase of the number of secure supermassive black hole (SMBH) detections. These SMBH measurements have lead astronomers to establish well defined empirical relationships between the SMBH mass and some of the properties of the host galaxy.
openaire   +1 more source

Probing black holes in a dark matter spike of M87 using quasinormal modes

European Physical Journal C: Particles and Fields
Dark matter density can be significantly enhanced by the supermassive black hole at the galactic center, leading to a structure called dark matter spike. Dark matter spike may change the spacetime properties of black holes that constitute deviations from
Dong Liu, Yi Yang, Zheng-Wen Long
doaj   +1 more source

Simulating ULXs and Blazars as GRMHD Accretion Flows Around a Black Hole

The Astrophysical Journal
General relativistic magnetohydrodynamic (GRMHD) simulations have been instrumental in our understanding of high-energy astrophysical phenomena over the past two decades.
Mayank Pathak, Banibrata Mukhopadhyay
doaj   +1 more source

Cosmological evolution of supermassive black holes in galactic centers unveiled by hard X-ray observations. [PDF]

Proc Jpn Acad Ser B Phys Biol Sci, 2015
Ueda Y.
europepmc   +1 more source

Using of the Correction Schwarzschild radius Equation and Its Application of the Black Holes

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017
  This study is a try to compare between the traditional Schwarzschild’s radius and the equation of Schwarzschild’s radius including the photon’s wavelength that is suggested by Kanarev for black holes to correct the error in the calculation of ...
Majida H. Al-kubaisy
doaj  

Modeling Targets and Optimal Frequencies for Imaging the Shadows of Nearby Supermassive Black Holes

The Astrophysical Journal
Horizon-scale imaging of supermassive black holes has opened a new avenue for studying strong-field gravity and plasma physics in low-luminosity accretion flows.
J. Cole Faggert, Feryal Özel, Dimitrios Psaltis   +2 more
doaj   +1 more source

Jets from a stellar-mass black hole are as relativistic as those from supermassive black holes. [PDF]

Nat Commun
Zhang X, Yu W, Carotenuto F, Fender R, Motta S, Bahramian A, Miller-Jones JCA, Russell TD, Corbel S, Woudt PA, Atri P, Knigge C, Sivakoff GR, Hughes AK, van den Eijnden J, Matthews JH, Baglio MC, Saikia P.   +17 more
europepmc   +1 more source

Learning about gravity from imaging supermassive black holes

I will discuss how the first images of the supermassive black holes M87* and Sgr A* were obtained by the EHT collaboration. In particular, I will describe the theoretical aspects that have allowed us to model the dynamics of the plasma accreting onto the
Rezzolla, Luciano
core  

Little red dots as young supermassive black holes in dense ionized cocoons. [PDF]

Nature
Rusakov V, Watson D, Nikopoulos GP, Brammer G, Gottumukkala R, Harvey T, Heintz KE, Damgaard R, Sim SA, Sneppen A, Vijayan AP, Adams N, Austin D, Conselice CJ, Goolsby CM, Toft S, Witstok J.   +16 more
europepmc   +1 more source