Results 111 to 120 of about 4,909 (237)
BLACK HOLE MASS ESTIMATES AND RAPID GROWTH OF SUPERMASSIVE BLACK HOLES IN LUMINOUS z similar to 3.5 QUASARS [PDF]
, 2015 We present new near-infrared (IR) observations of the H beta lambda 4861 and Mg II lambda 2798 lines for 32 luminous quasars with 3.2 < z < 3.9 using the Palomar Hale 200 inch telescope and the Large Binocular Telescope. We find that the Mg II FWHM
Wu, Xue-Bing +6 more
core +1 more source
The Astrophysical JournalIGR J17091–3624 is a black hole X-ray binary (BHXB), often referred to as the “twin” of GRS 1915+105 because it is the only other known BHXB that can show exotic “heartbeat”-like variability that is highly structured and repeated.
Jingyi Wang +15 more
doaj +1 more source
The Proton‐Alpha Instability as a Source of Ion Heating at Earth's Bow Shock
Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.Abstract Electrostatic waves are frequently observed at collisionless shocks and are believed to play a key role in energy dissipation. Recent spacecraft observations have identified a proton‐alpha instability in the Earth's bow shock as a potential mechanism to dissipate the energy associated with a relative drift between protons and alpha particles ...
N. Müller +3 more
wiley +1 more source
Spin-Orbit Alignment in Merging Binary Black Holes Following Collisions with Massive Stars
Merging binary black holes (BBHs) formed dynamically in dense star clusters are expected to have uncorrelated spin–orbit orientations since they are assembled through many random interactions.
Vanderzyden, Hans D. +4 more
core +1 more source
New High Precision Measurements of Apollo Samples: 0.3–5 GHz Complex Refractive Indices
Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.Abstract Active and passive radar techniques provide information on the subsurface structure and history of planetary bodies. However, interpretations of radar data are limited by our understanding of the complex dielectric permittivity and magnetic permeability of the surface material.
P. Linton +15 more
wiley +1 more source
, 2023 Large scale magnetic fields pervade the cosmic environment where the astrophysical black holes are often embedded and influenced by the mutual interaction.
Karas, Vladimir
core
Solar Energetic Particle Prediction in the Inner Heliosphere Using Deep Learning and PSP/IS⊙IS Data
Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.Abstract Solar events, such as coronal mass ejections and solar flares, accelerate large numbers of energetic charged particles, producing solar energetic particle (SEP) events that can harm astronauts, damage satellites, and potentially damage infrastructure on Earth.
Tate Hutchins +12 more
wiley +1 more source
Astrophysics of super-massive black hole mergers [PDF]
Classical and Quantum Gravity, 2013 We present here an overview of recent work in the subject of astrophysical manifestations of super-massive black hole (SMBH) mergers. This is a field that has been traditionally driven by theoretical work, but in recent years has also generated a great deal of interest and excitement in the observational astronomy community.
openaire +2 more sources
, 2013 Black holes are the ultimate prisons of the Universe, regions of spacetime where the enormous gravity prohibits matter or even light to escape to infinity.
Bence Kocsis +3 more
core +1 more source
Covariance Spectrum of MAXI J1820+070: On the Nature of the Comptonizing Flow
The Astrophysical JournalWe present an analysis of the covariance spectrum of the black hole X-ray binary MAXI J1820+070 during its hard state. For the first time, we extend coherence and covariance studies into the hard X-ray band up to ∼150 keV.
Shuai-Kang Yang +10 more
doaj +1 more source