Results 91 to 100 of about 7,819 (229)
Primordial Origins of Supermassive Black Holes [PDF]
, 2019 At the center of the Milky Way sits a supermassive black hole named Sagittarius A*1, which is over a million times the mass of our sun. Other galaxy centers host similar black holes which are up to thousands of times larger than even Sagittarius A*. Some
Black, William, Neilson, David
core +1 more source
Non-linearly scalarized supermassive black holes
European Physical Journal C: Particles and FieldsIn this study, we investigate a nonlinear mechanism driving the formation of scalarized rotating black holes within a scalar-Gauss–Bonnet gravity framework that includes an additional squared Gauss–Bonnet term.
Shoupan Liu +3 more
doaj +1 more source
Higher harmonics increase LISA's mass reach for supermassive black holes [PDF]
, 2007 Open Access.urrent expectations on the signal-to-noise ratios and masses of supermassive black holes which the Laser Interferometer Space Antenna (LISA) can observe are based on using in matched filtering only the dominant harmonic of the inspiral ...
Sathyaprakash, B.S. +12 more
core +1 more source
On the location of the supermassive black hole in CTA 102 [PDF]
Astronomy & Astrophysics, 2015 Relativistic jets in active galactic nuclei represent one of the most powerful phenomena in the Universe. They form in the surroundings of the supermassive black holes as a by-product of accretion onto the central black hole in active galaxies. The flow in the jets propagates at velocities close to the speed of light.
Fromm, Christian M. +4 more
openaire +5 more sources
Measuring the parameters of supermassive black holes from space [PDF]
, 2005 To describe black hole in astrophysics typically astronomers use Newtonian approaches for gravitational field because usually one analyzes processes acting far enough (in Schwarz- schild radius units) from black hole horizons.
A. F. Zakharov +3 more
core
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
openaire +5 more sources
Supermassive black holes and their feedback effects in galaxy formation [PDF]
, 2018 Supermassive black holes play a key role in modern galaxy formation research. They are conjectured to be present in almost all massive galaxies, and through the release of enormous amounts of energy triggered by gas accretion, they are able to ...
Weinberger, Rainer
core +1 more source
The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys
Advances in Astronomy, 2012 Significant progress has been made in the last few years on understanding how supermassive black holes form and grow. In this paper, we begin by reviewing the spectral signatures of active galactic nuclei (AGN) ranging from radio to hard X-ray ...
Ezequiel Treister, C. Megan Urry
doaj +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
Constraints on Alternatives to Supermassive Black Holes [PDF]
, 2020 Observations of the centers 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 centers.
M Coleman Miller
core