Results 111 to 120 of about 168,088 (243)
Supermassive black hole demographics: evading M − σ [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 We consider black hole - galaxy coevolution using simple analytic arguments. We focus on the fact that several supermassive black holes are known with masses significantly larger than suggested by the $M - $ relation, sometimes also with rather small stellar masses.
Andrew King, Rebecca Nealon
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Gravitational lensing effects of supermassive black holes in cluster environments [PDF]
, 2022 Guillaume Mahler +3 more
openalex +1 more source
, 2012 We consider test planet and photon orbits of the third kind inside a black hole, which are stable, periodic and neither come out of the black hole nor terminate at the singularity.
B. Carter +6 more
core +1 more source
Primordial black holes as supermassive black hole seeds
Journal of Cosmology and Astroparticle PhysicsAbstract The presence of supermassive black holes (SMBHs, M • ∼ 106-10 M ⊙) in the first cosmic Gyr (z ≳ 6) challenges current models of BH formation and evolution. We propose a novel mechanism for the formation of early SMBH seeds based on primordial black holes (PBHs).
F. Ziparo, S. Gallerani, A. Ferrara
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A NORMAL SUPERMASSIVE BLACK HOLE IN NGC 1277 [PDF]
The Astrophysical Journal, 2016 ABSTRACT The identification of galaxies with “overly massive” black holes requires two measurements: a black hole mass (M bh) and a host spheroid mass ( ). Here we provide our measurements for NGC 1277.
Alister W. Graham +7 more
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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
Testing General Relativity with the Reflection Spectrum of the Supermassive Black Hole in 1H0707-495. [PDF]
Physical Review Letters, 2017 Recently, we have extended the x-ray reflection model relxill to test the spacetime metric in the strong gravitational field of astrophysical black holes.
Z. Cao +4 more
semanticscholar +1 more source
Constraints on alternatives to supermassive black holes [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract Observations of the centres of galaxies continue to evolve, and it is useful to take a fresh look at the constraints that exist on alternatives to supermassive black holes at their centres. We discuss constraints complementary to those of Maoz and demonstrate that an extremely wide range of other possibilities can be excluded ...
openaire +2 more sources
A highly magnetized twin-jet base pinpoints a supermassive black hole [PDF]
, 2016 Supermassive black holes (SMBH) are essential for the production of jets in radio-loud active galactic nuclei (AGN). Theoretical models based on (Blandford & Znajek 1977, MNRAS, 179, 433) extract the rotational energy from a Kerr black hole, which could ...
A. Baczko +20 more
semanticscholar +1 more source
The Black Hole Particle Accelerator as a Machine to make Baby Universes [PDF]
, 2013 General relativity predicts that the inner horizon of an astronomically realistic rotating black hole is subject to the mass inflation instability. The inflationary instability acts like a gravity-powered particle accelerator of extraordinary power ...
Hamilton, A. J. S.
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