Results 81 to 90 of about 288,656 (295)
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 Contribution of Host Galaxy Properties in X-Ray Active Galactic Nuclei Clusters
American Journal of Astronomy and AstrophysicsIn this study, the influence of host galaxy properties on X-ray active galactic nuclei (AGN) clusters was investigated using multiwavelength data. X-ray data from the eFEDS main catalog, optical and near-infrared data from the fourth data release of KiDS/
Gutu Mekonen, Anno Kare
semanticscholar +1 more source
SUZAKU OBSERVATIONS OF MODERATELY OBSCURED (COMPTON-THIN) ACTIVE GALACTIC NUCLEI SELECTED BY SWIFT/BAT HARD X-RAY SURVEY [PDF]
, 2016 We report the results obtained by a systematic, broadband (0.5–150 keV) X-ray spectral analysis of moderately obscured (Compton-thin, 22 ≤ log N H < 24 ) active galactic nuclei (AGNs) observed with Suzaku and Swift/Burst Alert Telescope (BAT). Our sample
T. Kawamuro +4 more
semanticscholar +1 more source
BREAKING THE σ8−Ωm DEGENERACY USING THE CLUSTERING OF HIGH-z X-RAY ACTIVE GALACTIC NUCLEI
, 2010 The clustering of X-ray selected active galactic nuclei (AGNs) appears to be a valuable tool for extracting cosmological information. Using the recent high-precision angular clustering results of ∼30,000 XMM-Newton soft (0.5–2 keV) X-ray sources, which ...
S. Basilakos, M. Plionis
semanticscholar +1 more source
X-ray reflection from cold matter in Active Galactic Nuclei and X-ray binaries
, 1991 Weak, broad emission lines due to low-ionisation stages of iron, and other spectral features, have recently been observed in the X-ray spectra of Active Galactic Nuclei and in some Galatic X-ray binaries.
I. George, A. Fabian
semanticscholar +1 more source
LONG-TERM X-RAY VARIABILITY OF TYPICAL ACTIVE GALACTIC NUCLEI IN THE DISTANT UNIVERSE [PDF]
, 2016 We perform long-term (≈15 years, observed-frame) X-ray variability analyses of the 68 brightest radio-quiet active galactic nuclei (AGNs) in the 6 Ms Chandra Deep Field-South survey; the majority are in the redshift range of 0.6–3.1, providing access to ...
G. Yang +19 more
semanticscholar +1 more source
Ensemble X-ray variability of active galactic nuclei. II. Excess variance and updated structure function [PDF]
, 2016 Context. Most investigations of the X-ray variability of active galactic nuclei (AGN) have been concentrated on the detailed analyses of individual, nearby sources.
F. Vagnetti +4 more
semanticscholar +1 more source
The Astrophysical JournalA core sample of 59 unobscured type 1 active galactic nuclei (AGNs) with simultaneous XMM-Newton X-ray and UV observations is compiled from the archives to probe the nature of soft X-ray excess (SE).
Shi-Jiang Chen +7 more
doaj +1 more source
The Astrophysical Journal Supplement Series, 2022 Virial black hole (BH) mass ( M _BH ) determination directly involves knowing the broad-line region (BLR) clouds’ velocity distribution, their distance from the central supermassive BH ( R _BLR ), and the virial factor ( f ). Understanding whether biases
Federica Ricci +26 more
doaj +1 more source
A Hard Look at NGC 5347: Revealing a Nearby Compton-thick AGN [PDF]
, 2019 Current measurements show that the observed fraction of Compton-thick (CT) active galactic nuclei (AGN) is smaller than the expected values needed to explain the cosmic X-ray background. Prior fits to the X-ray spectrum of the nearby Seyfert-2 galaxy NGC
Barret, D. +13 more
core +5 more sources