Results 71 to 80 of about 7,819 (229)

Supermassive black holes in the early Universe [PDF]

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015
The recent discovery of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.3 has exacerbated the time compression problem implied by the appearance of supermassive black holes only approximately 900 Myr after the big bang, and only approximately 500 Myr beyond the formation of Pop II and III stars. Aside from heralding
F. Melia, T. M. McClintock
openaire   +2 more sources

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, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Dynamic accretion discs around supermassive black holes [PDF]

, 2021
Accretion discs around supermassive black holes act as the power houses of radiation to the most luminous, continuously emitting objects in the Universe; Active Galactic Nuclei (AGN).
Anagha Raj (10729904)
core   +1 more source

Chaotic accretion and merging supermassive black holes [PDF]

, 2012
Chaotic accretion and merging supermassive black holes ...
Christopher James Nixon (7599596), Christopher Nixon   +1 more
core   +2 more sources

Gravitational lensing by deformed Horava-Lifshitz black hole in rainbow gravity

Physics Letters B
In this study, we investigate the gravitational lensing effects of deformed Horava-Lifshitz black holes, considering both strong and weak-field limit approximations and incorporating the impact of rainbow functions.
Aniruddha Ghosh, Ujjal Debnath
doaj   +1 more source

Gravitational lensing by a quantum deformed Schwarzschild black hole

European Physical Journal C: Particles and Fields, 2021
We investigate the weak and strong deflection gravitational lensing by a quantum deformed Schwarzschild black hole and find their observables. These lensing observables are evaluated and the detectability of the quantum deformation is assessed, after ...
Xu Lu, Yi Xie
doaj   +1 more source

A DISPLACED SUPERMASSIVE BLACK HOLE IN M87 [PDF]

The Astrophysical Journal, 2010
ApJ Letters ...
Batcheldor, D, Robinson, A, Axon, D J, Perlman, E S, Merritt, D   +4 more
openaire   +3 more sources

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

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

The formation of satellite galaxies and their associated black holes [PDF]

, 2006
Not ...
Libeskind, Noam Isaac
core  

Shadow of a rotating squashed Kaluza-Klein black hole

Journal of High Energy Physics, 2019
We study the shadow of a rotating squashed Kaluza-Klein (KK) black hole and the shadow is found to possess distinct properties from those of usual rotating black holes.
Fen Long, Jieci Wang, Songbai Chen, Jiliang Jing   +3 more
doaj   +1 more source