Results 61 to 70 of about 9,238,867 (222)
The NH Distribution of Hard X-Ray Selected Active Galactic Nuclei in the NEP Field
The Astrophysical JournalX-ray surveys are one of the most unbiased methods for detecting Compton-thick (CT; N _H ≥ 10 ^24 cm ^−2 ) active galactic nuclei (AGN), which are thought to comprise up to 60% of AGN within z ≲ 1.0.
Samantha Creech +11 more
doaj +1 more source
X-ray Observations of Active Galactic Nuclei in the Cosmological Context
Astrophysics and Space Science, 1998 Partial financial support for this work was provided by the DGESID under project PB95-0122. ACF thanks the Royal Society for support.
Barcons, Xavier +6 more
openaire +2 more sources
Heavy X‐Ray Absorption in Soft X‐Ray–weak Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2001 30 pages, 10 figures, LaTeX, uses aaspp4.sty; submitted to ...
Gallagher, S. C. +6 more
openaire +2 more sources
Journal of Field Robotics, Volume 43, Issue 7, Page 4475-4514, October 2026.ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang +3 more
wiley +1 more source
The Astrophysical JournalX-ray variability provides a powerful probe of the innermost regions of active galactic nuclei (AGNs), offering valuable insights into the accretion process and the structure of the corona.
Ruisong Xia +11 more
doaj +1 more source
The X-ray/UV ratio in active galactic nuclei: dispersion and variability [PDF]
Astronomy & Astrophysics, 2018 Context. The well established negative correlation between the αOX spectral slope and the optical/ultraviolet (UV) luminosity, a by-product of the relation between X-rays and optical/UV luminosity, is affected by relatively large dispersion. The main contributors to this dispersion can be variability in the X-ray/UV ratio and/or changes in fundamental ...
Chiaraluce, E +3 more
openaire +5 more sources
Challenges and Opportunities for Layered Double Perovskite Solar Cells
Solar RRL, Volume 10, Issue 17, 15 September 2026.Layered lead‐free double perovskites suffer from intrinsic and extrinsic limitations that hinder high photovoltaic performance. This review identifies key challenges, including unfavorable band structures, strong self‐trapping, defect‐induced recombination, processing‐induced inhomogeneity, and device‐level mismatches.
Krishnaiah Mokurala +4 more
wiley +1 more source
Molecular Oncology, Volume 20, Issue S1, Page 1-692, August 2026.Precision Radiation Oncology, EarlyView.
wiley +2 more sources
X-ray absorption in Active Galactic Nuclei
, 2007 10 pages, 4 figures, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San Francisco: ASP)
Maiolino, R., Risaliti, G.
openaire +2 more sources
The Search for Very High Energy γ-rays from Misaligned AGN [PDF]
, 2013 The aim of this work is to study the potential for emission at very high energies (100 GeV) by misaligned active galactic nuclei (AGN) and the future prospects for observations of these objects with the next generation imaging atmospheric Cherenkov ...
CHEESEBROUGH, ALISTAIR
core