Results 71 to 80 of about 37,815 (249)

Supermassive black holes in galactic bulges [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2008
Abstract Growing evidence indicate supermassive black holes (SMBHs) in a mass range of MBH∼ 106–1010 M⊙ lurking in central stellar bulges of galaxies. Extensive observations reveal fairly tight power laws of MBH versus the mean stellar velocity dispersion σ of the host stellar bulge.
Yu-Qing Lou, Yu-Qing Lou, Yu-Qing Lou, Yan-Fei Jiang   +3 more
openaire   +3 more sources

Stochastic Quantum Mechanics in Curved Spaces: Application to Schwarzschild Black Holes

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT In this work, we start from the hypothesis that the universe lives in a Gravitational Wave Background (GWB). From this hypothesis, it follows that space–time is not locally flat because we have to take into account the fluctuations of the GWB in space–time. This implies that sufficiently small particles will feel these oscillations, preventing
Juan S. Jerez‐Rodriguez, Tonatiuh Matos   +1 more
wiley   +1 more source

On the High-Energy Neutrino Emission from Active Galactic Nuclei

Universe, 2018
We review observational aspects of the active galactic nuclei and their jets in connection with the detection of high-energy neutrinos by the Antarctic IceCube Neutrino Observatory.
Emma Kun, Peter L. Biermann, Silke Britzen, László Á. Gergely   +3 more
doaj   +1 more source

The estimation of black-hole masses in distant radio galaxies [PDF]

, 2010
We have estimated the masses of the central supermassive black holes of 2442 radio galaxies froma catalog compiled using data from the NED, SDSS, and CATS databases. Mass estimates based on optical photometry and radio data are compared.
A. Franceschini, A. I. Kopylov, A. Laor, A. Loeb, C. H. Nelson, C. J. Willot, C. Lang, D. Betton, D. P. Schneider, F. C. Adams, G. Bruzual, I. Yi, J. J. Condon, J. Kormendy, J. Kormendy, J. Magorian, J. Silk, K. Gebhardt, L. Ferrarese, M. Bolzonella, M. Breugel van, M. G. Haehlnet, M. Gu, M. L. Khabibullina, M. L. Khabibullina, M. L. Khabibullina, M. L. Khabibullina, M. Lacy, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O. V. Verkhodanov, O.V. Verkhodanov, P. Salucci, R. Falomo, R. J. McLure, R. J. McLure, S. Iskudarian, S. Rawlings, S. Tremaine, T. Matteo Di, T. R. Lauer, V. Sahni, W.-H. Bian, X. Fan, Y. Lu, Yu. P. Pskovskii   +51 more
core   +1 more source

Interplay of Magnetic Reconnection and Current Sheet Kink Instability in the Earth's Magnetotail

Geophysical Research Letters, Volume 52, Issue 2, 28 January 2025.
Abstract Magnetic reconnection and current sheet kink instability often develop concurrently in current sheets, yet their dynamic interplay remains unclear. We investigate their interaction in the magnetotail of a 3D global magnetospheric hybrid‐Vlasov simulation. We identify the instability growth and saturation phase and estimate the evolution of the
G. Cozzani, M. Alho, I. Zaitsev, H. Zhou, S. Hoilijoki, L. Turc, M. Grandin, K. Horaites, M. Battarbee, Y. Pfau‐Kempf, U. Ganse, K. Papadakis, M. Palmroth   +12 more
wiley   +1 more source

Supermassive black holes in the early universe [PDF]

Contemporary Physics, 2019
22 pages, 9 figures, Invited Review, Contemporary Physics, in ...
Aaron Smith, Volker Bromm
openaire   +3 more sources

Stellar Collisions in Galactic Nuclei: Impact on Destructive Events Near a Supermassive Black Hole

The Astrophysical Journal, 2023
The centers of galaxies host both a supermassive black hole and a dense stellar cluster. Such an environment should lead to stellar collisions, possibly at very high velocities so that the total energy involved is of the same order as supernova ...
Shmuel Balberg, Gilad Yassur
doaj   +1 more source

A NEARLY NAKED SUPERMASSIVE BLACK HOLE [PDF]

The Astrophysical Journal, 2017
ABSTRACT During a systematic search for supermassive black holes (SMBHs) not in galactic nuclei, we identified the compact, symmetric radio source B3 1715+425 with an emission-line galaxy offset ≈ 8.5
James J. Condon, Yuri Y. Kovalev, Yuri Y. Kovalev, Leonid Petrov, Jeremy Darling   +4 more
openaire   +4 more sources

Kretschmann Scalar for a Kerr-Newman Black Hole [PDF]

, 1999
I have derived the Kretschmann scalar for a general black hole of mass m, angular momentum per unit mass a, and electric charge Q. The Kretschmann scalar gives the amount of curvature of spacetime, as a function of position near (and within) a black hole.
Henry, Richard C.
core   +3 more sources

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source