Results 111 to 120 of about 132,127 (279)
Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background
Advances in High Energy Physics, 2015 This paper is devoted to studying two interesting issues of a black hole with string cloud background. Firstly, we investigate null geodesics and find unstable orbital motion of particles. Secondly, we calculate deflection angle in strong field limit. We
M. Sharif, Sehrish Iftikhar
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The Milky Way’s Supermassive Black Hole: How Good a Case Is It? [PDF]
, 2017 The compact and, with $${\sim }4.3\pm 0.3\times 10^6$$∼4.3±0.3×106 M$$_{\odot }$$⊙, very massive object located at the center of the Milky Way is currently the very best candidate for a supermassive black hole (SMBH) in our immediate vicinity.
A. Eckart +9 more
semanticscholar +1 more source
Nuclear Spirals and Supermassive Black Holes [PDF]
Symposium - International Astronomical Union, 2004 We have performed SPH simulations for the response of the gaseous disks to the imposed potentials including those from bars and SMBHs. Evolution of the nuclear regions of gaseous disks depends critically on the masses of SMBHs as well as the sound speed in the gas.
Hong Bae Ann, Parijat Thakur
openaire +3 more sources
Galaxies, 2022 The observed Tully-Fisher and Faber-Jackson laws between the baryonic mass of galaxies and the velocity of motion of stars at the edge of galaxies are explained within the framework of the model of accretion of galaxies around supermassive black holes ...
Nick Gorkavyi
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Dark energy and supermassive black holes [PDF]
Physical Review D, 2004 This paper deals with a cosmological model in which the universe is filled with tachyon dark energy in order to describe current and future accelerating expansion. We obtain that the simplest condition for the regime of phantom energy to occur in this scenario is that the scalar field be Wick rotated to imaginary values which correspond to an axionic ...
openaire +4 more sources
Supermassive black holes in the early Universe [PDF]
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015 The recent discovery of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.3 has exacerbated the time compression problem implied by the appearance of supermassive black holes only approximately 900 Myr after the big bang, and only approximately 500 Myr beyond the formation of Pop II and III stars.
F. Melia, T. M. McClintock
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Close supermassive binary black holes [PDF]
Nature, 2010 Nature in press. 4 pages, 1 figure [Title, abstract, text, and references shortened to conform to journal requirements]
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Powerful Radio Sources as Probes of Black Hole Physics
UniversePowerful jetted radio sources for which the luminosity in directed kinetic energy has been empirically determined, independent of assumptions, are considered.
Ruth A. Daly
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Black hole shadow with a cosmological constant for cosmological observers
European Physical Journal C: Particles and Fields, 2019 We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological constant changes the angular size of the black hole shadow for static ...
Javad T. Firouzjaee, Alireza Allahyari
doaj +1 more source
Updating the (Supermassive Black Hole Mass) - (Spiral Arm Pitch Angle) Relation: A Strong Correlation for Galaxies with Pseudobulges [PDF]
, 2017 We have conducted an image analysis of the (current) full sample of 44 spiral galaxies with directly measured supermassive black hole (SMBH) masses, $M_{\rm BH}$, to determine each galaxy's logarithmic spiral arm pitch angle, $\phi$. For predicting black
Benjamin Lee Davis, A. Graham, M. Seigar
semanticscholar +1 more source