Results 61 to 70 of about 2,137,135 (205)

ASTROPHYSICAL IMPLICATIONS OF THE BINARY BLACK HOLE MERGER GW150914 [PDF]

open access: yesThe Astrophysical Journal Letters, 2016
ABSTRACT The discovery of the gravitational-wave (GW) source GW150914 with the Advanced LIGO detectors provides the first observational evidence for the existence of binary black hole (BH) systems that inspiral and merge within the age of the universe.
Abbott, B. P.   +440 more
openaire   +31 more sources

Geophysical Investigation of a Thermal Field in Abu Dhabi, United Arab Emirates

open access: yesEarth and Space Science, Volume 13, Issue 9, September 2026.
Abstract In the Abu Dhabi Emirate, near Madinat Zayed and Liwa, studies have identified high geothermal gradients and high‐heat‐flow areas. Assessing the geothermal potential in this region requires a detailed mapping of subsurface geological formations and their thermal properties.
Hakim Saibi   +3 more
wiley   +1 more source

Astrophysical black holes [PDF]

open access: yes, 2019
In this chapter, we introduce the concept of a black hole (BH) and recount the initial theoretical predictions. We then review the possible types of BHs in nature, from primordial, to stellar-mass, to supermassive BHs. Finally, we focus on the latter category and on their intricate relation with their host galaxies.
openaire   +3 more sources

Satellite‐Derived Volume Budget of Antarctic Sea Ice

open access: yesEarth and Space Science, Volume 13, Issue 9, September 2026.
Abstract In recent years, the Antarctic has seen a notable shift in sea ice trends: Where sea ice extent and volume were increasing on average, they have shown an unprecedented decline since 2016. Understanding the drivers of this shift is crucial to determining the impacts of climate change on sea ice and improving modeling of Antarctic sea ice ...
Sabina Sulikova   +14 more
wiley   +1 more source

Introduction to Black Hole Astrophysics [PDF]

open access: yes, 2014
This book is based on the lecture notes of the course on black hole astrophysicsgiven at the University of La Plata, Argentina, by one of us (GER). The materialaims at advanced undergraduate and graduate students with interest in astrophysics.The course takes one semester and is usually complemented by a course on high-energyastrophysics.
Romero, Gustavo Esteban   +1 more
openaire   +2 more sources

A Simple Model for Extracting Astrophysics from Black Hole Images

open access: yesThe Astrophysical Journal
The Event Horizon Telescope (EHT) is providing unprecedented high-resolution images of supermassive black holes. These images are fundamentally related to properties of the luminous accretion disks, since black holes themselves produce no light.
Alexandra G. Guerrero, Daniel E. Holz
doaj   +1 more source

A study of black holes in F(R)-ModMax gravity: Gravitational lensing and constraints from EHT observations

open access: yesPhysics Letters B
The study of astrophysical phenomena like black hole shadows is an effective approach to properly understand the modified gravity and explore its validity.
Khadije Jafarzade   +2 more
doaj   +1 more source

On the Effects of the Solar Wind Structure in the Global Distribution of dBH/dt ${\text{dB}}_{H}/\text{dt}$ Spikes During Geomagnetic Storms

open access: yesJournal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Variations in the solar wind, particularly those associated with interplanetary coronal mass ejections (ICMEs) and high‐speed streams (HSSs), drive geomagnetic disturbances that produce rapid changes in the ground magnetic field. These variations, commonly quantified by the time derivative of the horizontal magnetic field dBH/dt $\left({\text ...
José P. Marchezi   +8 more
wiley   +1 more source

New Estimates of the Spin and Accretion Rate of the Black Hole M87*

open access: yesThe Astrophysical Journal Letters
In this Letter, we use the imaging results of M87* from the Event Horizon Telescope (EHT) to calculate the rotational velocity of the inner edge of the accretion disk and find a value of ∼0.14 c .
Michael Drew   +4 more
doaj   +1 more source

Image features of spinning regular black holes based on a locality principle

open access: yesEuropean Physical Journal C: Particles and Fields, 2021
To understand the true nature of black holes, fundamental theoretical developments should be linked all the way to observational features of black holes in their natural astrophysical environments. Here, we take several steps to establish such a link. We
Astrid Eichhorn, Aaron Held
doaj   +1 more source

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