Results 111 to 120 of about 63,914 (268)
The Most Obscured AGNs in the XMM-SERVS Fields
The Astrophysical Journal, 2023 We perform X-ray spectral analyses to derive the characteristics (e.g., column density, X-ray luminosity) of ≈10,200 active galactic nuclei (AGNs) in the XMM-Spitzer Extragalactic Representative Volume Survey, which was designed to investigate the growth
Wei Yan +11 more
doaj +1 more source
The hard X-ray view of bright infrared galaxies
, 2009 Aims. The synthesis of the cosmic X-ray background (CXB) requires a large population of Compton-thick active galactic nuclei that have not been detected so far.
Akylas +39 more
core +1 more source
The Relationship of Hard X-Ray and Optical Line Emission in Low-Redshift Active Galactic Nuclei [PDF]
, 2005 In this paper we assess the relationship of the population of active galactic nuclei (AGNs) selected by hard X-rays to the traditional population of AGNs with strong optical emission lines. First, we study the emission-line properties of a new hard-X-ray-
T. Heckman +4 more
semanticscholar +1 more source
Radiation pressure acceleration by X-rays in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We present calculations of the dynamics of highly ionized gas clouds that are confined by external pressure, and are ionized by AGN continuum. We focus on the gas that is seen in absorption in the X-ray spectrum of many AGN and show that such gas can reach hydrostatic equilibrium under various conditions. The principal conclusion is that the clouds can
Chelouche, Doron, Netzer, Hagai
openaire +2 more sources
Annalen der Physik, Volume 538, Issue 3, March 2026.Carrollian Reissner‐Nordström black holes are investigated through fermionic tunneling, entropy‐corrected thermodynamics, and plasma‐modified gravitational lensing. The generalized uncertainty principle introduces minimal‐length corrections to the Hawking temperature, while the combined Barrow‐Exponential entropy reveals smooth thermodynamic crossovers
Erdem Sucu, İzzet Sakallı, Yusuf Sucu
wiley +1 more source
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
A Simple Method for Predicting N H Variability in Active Galactic Nuclei
The Astrophysical Journal, 2023 The unified model of active galactic nuclei (AGNs) includes a geometrically thick obscuring medium to explain the differences between type I and type II AGNs as an effect of inclination angle.
Isaiah S. Cox +6 more
doaj +1 more source
X-ray flux variability of active galactic nuclei observed using NuSTAR [PDF]
, 2016 We present results of a systematic study of flux variability on hourly time-scales in a large sample of active galactic nuclei (AGN) in the 3−79 keV band using data from Nuclear Spectroscopic Telescope Array.
P. Rani, C. .. Stalin, S. Rakshit
semanticscholar +1 more source
Energy Technology, Volume 14, Issue 3, March 2026.The BA2MA3Pb4I13, where (BA is butylammonium, MA is methylammonium) quasi‐2D halide perovskites are identified as a promising material with a suitable bandgap of 1.9 eV for indoor light harvesting. A combination of lower thickness of 260 nm, better phase purity and greater (202) crystal orientation obtained from preheating, yielded a champion power ...
Aveena Abee Varghese +4 more
wiley +1 more source
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