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Evidence for supermassive black hole binaries [PDF]
We review the state of the evidence for the existence and observational appearance of supermassive black hole binaries. Such objects are expected from standard hierarchical galaxy evolution to form after two galaxies, each containing a supermassive black
Britzen, Silke +19 more
core +6 more sources
The Black Hole Mass Function: From Stellar to Supermassive [PDF]
, 2023 The overall purpose of this thesis is to establish the black hole (BH) mass function, from stellar to supermassive. We divide this work into two: 1) the stellar black hole mass function covering the mass range $m_{\bullet} \sim 5 - 150 \ M_{\odot}$; 2 ...
SICILIA, ALEXANDER MARC
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Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade
Radio Science, Volume 60, Issue 7, July 2025.Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park +13 more
wiley +1 more source
The Black Hole Spin Controversy [PDF]
, 2012 Astrophysical black holes are the simplest possible objects. They are completely described by only two parameters in general relativity, their mass and the specific angular momentum, spin.
KOLEHMAINEN, MARI,JOHANNA +1 more
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, 2013 Image of star cluster black hole. Scientists had believed that supermassive black holes, located at the centres of galaxies, increased their mass in step with the growth of their host galaxy.
Alister W. Graham, Gabriel Perez Diaz
core +1 more source
Astronomische Nachrichten, Volume 346, Issue 5, June 2025.ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley +1 more source
Stochastic Quantum Mechanics in Curved Spaces: Application to Schwarzschild Black Holes
Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.ABSTRACT In this work, we start from the hypothesis that the universe lives in a Gravitational Wave Background (GWB). From this hypothesis, it follows that space–time is not locally flat because we have to take into account the fluctuations of the GWB in space–time. This implies that sufficiently small particles will feel these oscillations, preventing
Juan S. Jerez‐Rodriguez +1 more
wiley +1 more source
Breaking black-hole uniqueness at supermassive scales [PDF]
International audienceIn general relativity, all vacuum black holes are described by the Kerr solution. Beyond general relativity, there is a prevailing expectation that deviations from the Kerr solution increase with the horizon curvature.
Silva, Hector O. +5 more
core +2 more sources
Formation of Supermassive Black Hole
, 2023 The Star formation model is used in this study to examine the formation of quasars and Supermassive Black Holes (SMBH).The difference in SMBH formation is that materials that fall into the disk surrounding black holes do not contribute to their final ...
Subba, Susmita
core +2 more sources
Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background
Advances in High Energy Physics, 2015 This paper is devoted to studying two interesting issues of a black hole with string cloud background. Firstly, we investigate null geodesics and find unstable orbital motion of particles. Secondly, we calculate deflection angle in strong field limit. We
M. Sharif, Sehrish Iftikhar
doaj +1 more source