Results 31 to 40 of about 36,081 (203)

Hierarchical build-up of galactic bulges and the merging rate of supermassive binary black holes

, 2003
The hierarchical build-up of galactic bulges should lead to the build-up of present-day supermassive black holes by a mixture of gas accretion and merging of supermassive black holes.
Begelman M, Begelman M, Bender P, Bernardi M, Gerssen J, Haehnelt M G, Haehnelt M G, Haehnelt M G, Martin G Haehnelt, Milosavljevic M, Soltan A, Yu Q   +11 more
core   +1 more source

A Unified Model for the Evolution of Galaxies and Quasars [PDF]

, 1999
We incorporate a simple scheme for the growth of supermassive black holes into semi-analytic models that follow the formation and evolution of galaxies in a cold dark matter dominated Universe.
G. Kauffmann, M. Haehnelt, Rees
core   +2 more sources

Gravitational lensing by a Horndeski black hole

European Physical Journal C: Particles and Fields, 2017
In this article we study gravitational lensing by non-rotating and asymptotically flat black holes in Horndeski theory. By adopting the strong deflection limit, we calculate the deflection angle, from which we obtain the positions and the magnifications ...
Javier Badía, Ernesto F. Eiroa
doaj   +1 more source

Primordial seeds of supermassive black holes

, 2012
Supermassive black holes exist in the centers of galaxies, including Milky Way, but there is no compelling theory of their formation. Furthermore, observations of quasars imply that supermassive black holes have already existed at some very high ...
Kawasaki, Masahiro, Kusenko, Alexander, Yanagida, Tsutomu T.   +2 more
core   +1 more source

On the relation between the mass of Compact Massive Objects and their host galaxies [PDF]

, 2017
Supermassive black holes and/or very dense stellar clusters are found in the central regions of galaxies. Nuclear star clusters are present mainly in faint galaxies while upermassive black holes are common in galaxies with masses $\geq 10^{10}$ M$_\odot $
Capuzzo-Dolcetta, R., Melo, I. Tosta e
core   +2 more sources

First Detection of an Overmassive Black Hole Galaxy UHZ1: Evidence for Heavy Black Hole Seed Formation from Direct Collapse

The Astrophysical Journal Letters, 2023
The recent Chandra-JWST discovery of a quasar in the z ≈ 10.1 galaxy UHZ1 reveals that accreting supermassive black holes were already in place 470 million years after the Big Bang. The Chandra X-ray source detected in UHZ1 is a Compton-thick quasar with
Priyamvada Natarajan, Fabio Pacucci, Angelo Ricarte, Ákos Bogdán, Andy D. Goulding, Nico Cappelluti   +5 more
doaj   +1 more source

Primordial black holes as dark matter candidates

SciPost Physics Lecture Notes, 2022
We review the formation and evaporation of primordial black holes (PBHs) and their possible contribution to dark matter. Various constraints suggest they could only provide most of it in the mass windows $10^{17}$ - $10^{23}\,$g or $10$ - $10^{2}\,M_ ...
Bernard Carr, Florian Kuhnel
doaj   +1 more source

A Radio Census of Binary Supermassive Black Holes

, 2010
Using archival VLBI data for 3114 radio-luminous active galactic nuclei, we searched for binary supermassive black holes using a radio spectral index mapping technique which targets spatially resolved, double radio-emitting nuclei.
Beasley, Begelman, Boroson, Britzen, Colpi, Comerford, De Lucia, De Propris, Decarli, Detweiler, Dunlop, Enoki, Ferrarese, Fomalont, Frank, Giovannini, Gualandris, Haring, Jaffe, Jenet, Komossa, Komossa, Kovalev, Lacey, Lister, Lovell, Mason, Mauch, McLure, Merritt, Merritt, Myers, Owsianik, Padovani, Peterson, Petrov, Petrov, Petrov, Pollack, Rajagopal, Rodriguez, S. Burke-Spolaor, Saripalli, Sault, Sesana, Sesana, Slee, Springel, Sudou, Valtonen, Volonteri, Walker, Wang, Wen, Wilkinson, Wyithe, Yu   +56 more
core   +1 more source

Supermassive Black Hole Growth in Hierarchically Merging Nuclear Star Clusters

The Astrophysical Journal
Supermassive black holes are prevalent at the centers of massive galaxies, and their masses scale with galaxy properties, increasing evidence suggesting that these trends continue to low stellar masses.
Konstantinos Kritos, Ricarda S. Beckmann, Joseph Silk, Emanuele Berti, Sophia Yi, Marta Volonteri, Yohan Dubois, Julien Devriendt   +7 more
doaj   +1 more source

Starburst-AGN Connection: A Lesson from High-z Powerful Radio Galaxies

, 2004
Powerful radio galaxies at high redshift are highly useful in studies of early evolution of AGN-hosting galaxies because their observed optical and near infrared light are dominated by their stellar population rather than the nonthermal continuum emitted
Taniguchi, Yoshiaki
core   +2 more sources