Results 111 to 120 of about 37,389 (216)

Variabilities Driven by Satellite Black Hole Migration in Active Galactic Nucleus Disks

The Astrophysical Journal
The physical origin of active galactic nucleus (AGN) variability remains unclear. Here we propose that the magnetic reconnection induced by the migration of satellite black holes (sBHs) in the AGN disk can be a new plausible mechanism for AGN short-term ...
Jing-Tong Xing, Tong Liu, Bao-Quan Huang, Mouyuan Sun   +3 more
doaj   +1 more source

Observing the Seyfert 2 nucleus of NGC 1068 with the VLT Interferometer

, 2004
Dusty tori have been suggested to play a crucial role in determining the physical characteristics of active galactic nuclei (AGN), but investigation of their properties has stalled for lack of high resolution mid-IR imaging.
Jaffe, Walter, Leinert, Christoph, Meisenheimer, Klaus, Richichi, Andrea, Rottgering, Huub, Sol, Helen, Wittkowski, Markus   +6 more
core   +2 more sources

Deletion of a Pax1 Sex‐Associated Genomic Region Associated With Adolescent Idiopathic Scoliosis Leads to Disc Degeneration, Instability, and Vertebral Rotation in Mice

JOR SPINE, Volume 9, Issue 2, June 2026.
Overview of the effects of Pax1‐SAR deletion on gene expression, IVD degeneration, and resultant scoliotic‐like curvature between sexes. Proposed mechanism of sex‐dependent changes in gene expression in females (right) and males (left), resulting in sex‐dependent disc degeneration and scoliotic phenotypes.
Edward C. Moody, Emma M. Wade, Shuji Mizumoto, Jeremy McCallum‐Loudeac, Megan J. Wilson   +4 more
wiley   +1 more source

Accretion of Active Galactic Nucleus Stars Under the Influence of Disk Geometry

The Astrophysical Journal
Massive stars can form within or be captured by active galactic nucleus disks, influencing both the thermal structure and metallicity of the disk environment.
Yi-Xian Chen, Yan-Fei Jiang, Jeremy Goodman   +2 more
doaj   +1 more source

Experimental methods in chemical engineering: Atomic absorption spectrometry—AAS

The Canadian Journal of Chemical Engineering, Volume 104, Issue 5, Page 2206-2224, May 2026.
Abstract Elements absorb electromagnetic radiation (light) of a specific wavelength in proportion to the number of atoms in its path. As the atoms absorb this light energy, electrons rise from the ground state to an excited state. In atomic absorption spectrometry (AAS), high temperatures produce clouds of atoms from the sample (atomization) and ...
Emily Cintia Tossi de A. Costa, Jildimara de Jesus Santana, Viviane de Oliveira Campos, Felipe Fernandes Barbosa, Gregory S. Patience   +4 more
wiley   +1 more source

Seafloor Sediments, Morphologic Features, and Geotechnical Properties of Harrison Bay in the Alaskan Beaufort Sea

Earth and Space Science, Volume 13, Issue 5, May 2026.
Abstract Sediments on Arctic continental shelves are impacted by sea ice and ice‐related processes for up to 9 months per year. As a result, seabed morphology in cold regions can exhibit features such as ice scours which are absent on lower‐latitude shelves.
E. F. Eidam, N. Stark, J. H. Nienhuis, D. Duncan, N. Brilli, N. Kallioras, R. Smith, A. D. J. Heath   +7 more
wiley   +1 more source

The First Triple Radio Active Galactic Nucleus in an Ongoing Galaxy Merger

The Astrophysical Journal Letters
Galaxy mergers are predicted to be a critical stage of merger-driven SMBH growth and galaxy evolution. Systems exhibiting multiple active galactic nuclei (AGN) are an important observational tool for constraining the prevalence and properties of merging ...
Emma Schwartzman, Ryan W. Pfeifle, Tracy E. Clarke, Kimberly A. Weaver, Nathan J. Secrest, Barry Rothberg, Miranda McCarthy, Daniel Stern, Peter G. Boorman, Joanna Piotrowska   +9 more
doaj   +1 more source

Spoon-feeding an active galactic nucleus [PDF]

Proceedings of Swift: 10 Years of Discovery — PoS(SWIFT 10), 2015
Deborah Mainetti, Sergio Campana, Monica Colpi, Giuseppe Lodato, Paolo D'Avanzo, Phil Evans, Alberto Moretti   +6 more
openaire   +1 more source

Constraining the Hydration of Clay Minerals and Abundances of Amorphous Phases in Gale Crater, Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Both water and organic matter are required for the development and persistence of life. Phyllosilicates (clay minerals) have high surface areas that easily sorb water and organic matter. The Curiosity rover has investigated several hundred meters of stratigraphy in Gale crater, including where clays were detected from orbit.
Sean Czarnecki, Craig Hardgrove, Liz Rampe, Patrick Gasda   +3 more
wiley   +1 more source

Systematic Analysis of Changing-Look Active Galactic Nucleus Variability Using ZTF Light Curves

The Astrophysical Journal
Changing-look active galactic nuclei (CLAGNs) are a unique population of AGNs that exhibit the appearance (turn-on) or disappearance (turn-off) of broad emission lines.
Huimei Wang, Xue-Bing Wu, Nanyu Yao, Bing Lyu, Yuxuan Pang, Yuming Fu, Rui Zhu, Qian Yang   +7 more
doaj   +1 more source