Results 51 to 60 of about 37,815 (249)
Oscillating axion bubbles as alternative to supermassive black holes at galactic centers [PDF]
, 2006 Recent observations of near-infrared and X-ray flares from Sagittarius A*, which is believed to be a supermassive black hole at the Galactic center, show that the source exhibits about 20-minute periodic variability.
Anatoly A Svidzinsky +9 more
core +2 more sources
Formation of supermassive black holes [PDF]
The Astronomy and Astrophysics Review, 2010 To appear in The Astronomy and Astrophysics Review.
openaire +4 more sources
The distribution of supermassive black holes in the nuclei of nearby galaxies [PDF]
, 1998 The growth of supermassive black holes by merging and accretion in hierarchical models of galaxy formation is studied by means of Monte Carlo simulations.
Cattaneo, A. +4 more
core +4 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 +9 more
openaire +6 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
Evolution of supermassive black holes [PDF]
, 2011 The cosmological evolution of supermassive black holes (SMBHs) seems to be intimately linked to their host galaxies. Active galactic nuclei (AGN) can be probed by deep X-ray surveys. We review results from large X-ray selected samples including first results from the XMM-Newton COSMOS survey.
Günther Hasinger, Andreas Müller
openaire +3 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 +5 more
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 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 +2 more
doaj +1 more source