Results 41 to 50 of about 38,906 (246)

Extreme Mass Ratio Binary: Radiation reaction and gravitational waveform [PDF]

, 2005
For a successful detection of gravitational waves by LISA, it is essential to construct theoretical waveforms in a reliable manner. We discuss gravitational waves from an extreme mass ratio binary system which is expected to be a promising target of the ...
Barack L, Hughes S A, Hughes S A, Mino Y, Mino Y, Mino Y, Papapetrou A, Poisson E, Yasushi Mino   +8 more
core   +2 more sources

A supermassive black hole awakes [PDF]

Science, 2017
Active Galaxies Every large galaxy hosts a supermassive black hole at its center, which grows by consuming passing gas or stars. Most are quiescent, but when the black hole is feeding, an accretion disk forms, causing the galaxy nucleus to shine brightly as a quasar. Gezari et al.
openaire   +3 more sources

The GLEAMing of the first supermassive black holes

Publications of the Astronomical Society of Australia, 2020
AbstractWe present the results of a new selection technique to identify powerful ($L_{\rm 500\,MHz} \gt 10^{27}\,\text{WHz}^{-1}$) radio galaxies towards the end of the Epoch of Reionisation. Our method is based on the selection of bright radio sources showing radio spectral curvature at the lowest frequency (${\sim}100\,\text{MHz}$) combined with the ...
Guillaume Drouart, Nick Seymour, Tim J. Galvin, Jose Afonso, Joseph R. Callingham, Carlos De Breuck, Melanie Johnston-Hollitt, Anna D. Kapińska, Matthew D. Lehnert, Joël Vernet   +9 more
openaire   +6 more sources

The supermassive black hole of Fornax A^★ [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
The radio galaxy Fornax A (NGC 1316) is a prominent merger remnant in the outskirts of the Fornax cluster. Its giant radio lobes suggest the presence of a powerful AGN and thus a central supermassive black hole (SMBH). We present high-resolution adaptive optics assisted integral-field data of Fornax A, taken with SINFONI at the Very Large Telescope in ...
Karl Gebhardt, Richard Davies, Nina Nowak, Roberto P. Saglia, Jens Thomas, Ralf Bender   +5 more
openaire   +4 more sources

Black Hole Images as Tests of General Relativity: Effects of Spacetime Geometry

The Astrophysical Journal, 2023
The images of supermassive black holes surrounded by optically thin, radiatively inefficient accretion flows, like those observed with the Event Horizon Telescope, are characterized by a bright ring of emission surrounding the black hole shadow.
Ziri Younsi, Dimitrios Psaltis, Feryal Özel   +2 more
doaj   +1 more source

Spectroscopy of the near-nuclear regions of Cygnus A: estimating the mass of the supermassive black hole [PDF]

, 2003
We use a combination of high spatial resolution optical and near-IR spectroscopic data to make a detailed study of the kinematics of the NLR gas in the near-nuclear regions of the powerful, FRII radio galaxy Cygnus A (z=0.0560), with the overall goal of ...
A. Marconi, Antonucci, Bach, Barth, Barthel, Blanco, Bower, Bruzual, C. Tadhunter, Carilli, Carilli, Conway, Corbett, D. Axon, Djorgovski, Elvis, Faber, Fabian, Ferrarese, Fosbury, Franceschini, Gebhardt, Ghisellini, Jackson, K. Wills, Kaspi, Kellerman, Kormendy, Krichbaum, Maloney, Marconi, Marconi, Marconi, McLean, McLure, McLure, N. Jackson, Ogle, Osterbrock, Owen, Reynolds, Silk, Simkin, Sorathia, Spinrad, Stockton, T. G. Robinson, Tadhunter, Tadhunter, Tadhunter, Tadhunter, Tadhunter, Taylor, Thornton, Tremaine, Ueno, van der Marel, Verdoes Kleijn, Verdoes Kleijn, Ward, Young   +60 more
core   +3 more sources

The formation of supermassive black holes and the evolution of supermassive stars [PDF]

Classical and Quantum Gravity, 2001
The existence of supermassive black holes is supported by a growing body of observations. Supermassive black holes and their formation events are likely candidates for detection by proposed long-wavelength, space-based gravitational wave interferometers like LISA.
Stuart L. Shapiro, Kimberly C. B. New
openaire   +4 more sources

Strong deflection lensing by a Lee–Wick black hole

Physics Letters B, 2017
We study strong deflection gravitational lensing by a Lee–Wick black hole, which is a non-singular black hole generated by a high derivative modification of Einstein–Hilbert action.
Shan-Shan Zhao, Yi Xie
doaj   +1 more source

Black Holes, Mergers, and the Entropy Budget of the Universe

, 2002
Vast amounts of entropy are produced in black hole formation, and the amount of entropy stored in supermassive black holes at the centers of galaxies is now much greater than the entropy free in the rest of the universe.
Abrahams A M (Binary Black Hole Grand Challenge Alliance Collaboration), Anninos P, Anninos P, Barr S M, Baumgarte T W, Flanagan E E, Holman R, Janka H T, Kamionkowski M, Macchetto E D, Postnov K A, Rees M J, Saijo M, Shibata M, Silk J, Starkman G D, Thomas W Kephart, Tinto M, Totani T, Valageas P, Wilson J R, Y Jack Ng, Yungelson L   +22 more
core   +2 more sources

Supermassive black holes then and now [PDF]

AIP Conference Proceedings, 1998
7 pages, to appear in The Proceedings of the Second International LISA Symposium on Graviational Waves, ed.
openaire   +5 more sources