Results 71 to 80 of about 50,208 (269)
A Systematic Search for X-Ray Eclipse Events in Active Galactic Nuclei Observed by Swift
The Astrophysical JournalThe nuclear regions of active galactic nuclei (AGNs) likely host clumpy clouds that occasionally obscure the central X-ray source, causing eclipse events. These events offer a unique opportunity to study the properties and origins of such clouds. However,
Tianying Lian, Chichuan Jin, Weimin Yuan
doaj +1 more source
Subgrain and Cavity Development during Creep of Al‐3.85%Mg
Advanced Engineering Materials, Volume 27, Issue 23, December 2025.Al‐3.85%Mg does form subgrains if crept at very high strains. This fact allows the unification of the creep description in two different alloys such as pure Al and Al–Mg alloys. It is classically considered that the creep mechanisms for type M (e.g., pure Al) and type A alloys (e.g., Al–Mg alloys) are different.
Augusta Isaac +6 more
wiley +1 more source
The Role of Environment in Triggering Active Galactic Nuclei—Evidence for a Change at z ∼ 1
The Astrophysical JournalWhat triggers active galactic nuclei (AGN) in some galaxies and what role this brief period of activity plays in the overall evolution of galaxies are still open questions. This paper explores whether or not the local, on scales of ≈1 Mpc, galaxy density
Jason R. Reeves +4 more
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Magnetic reconnection: flares and coronal heating in Active Galactic Nuclei [PDF]
, 1998 A magnetically-structured accretion disk corona, generated by buoyancy instability in the disk, can account for observations of flare--like events in Active Galactic Nuclei.
Di Matteo, T.
core +3 more sources
Extreme X-Ray Iron Lines in Active Galactic Nuclei
The Astrophysical Journal, 2002 We analyze X-ray spectra of heavily obscured (N_H > 10^{24} cm^{-2}) active galaxies obtained with Chandra, concentrating on the iron K alpha fluorescence line. We measure very large equivalent widths in most cases, up to 5 keV in the most extreme example.
Levenson, N. A. +6 more
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Active Galactic Nuclei Unification and the X‐Ray Background [PDF]
The Astrophysical Journal, 2005 Active galactic nuclei (AGNs) unification, which implies a large number of obscured AGNs, can explain the optical, infrared, and X-ray content of deep multiwavelength surveys. Here we show that the same model also successfully explains the spectral shape and intensity of the X-ray background. The simplest possible unified model assumes a constant ratio
Treister, Ezequiel, Urry, Claudia Megan
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Millikelvin Intracellular Nanothermometry with Nanodiamonds
Advanced Science, Volume 12, Issue 45, December 4, 2025.Nanothermometry in living cells is crucial for understanding heat diffusion and advancing cellular biology and drug discovery. Previous studies have reported controversial intracellular temperature variations. Using nanodiamond nanothermometry in macrophages, it is found that, in such experimental setting, apparent temperature changes are actually due ...
Maabur Sow +26 more
wiley +1 more source
Test for Echo: X-Ray Reflection Variability in the Seyfert-2 Active Galactic Nucleus NGC 4388
The Astrophysical JournalWe report on a study of the narrow Fe K α line and reflection spectrum in the well-known Seyfert-2 active galactic nucleus (AGN), NGC 4388. X-ray spectra summed from two extensive NICER monitoring campaigns, separated by years, show strong evidence of ...
Ben Gediman +6 more
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Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
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Infrared Emission Properties of Active Galactic Nuclei from Swift-BAT Hard X-Ray Survey [PDF]
, 2021 Xiao‐Hong Yang
openalex +1 more source