Results 31 to 40 of about 69 (69)
The infrared--X-ray continuum correlation in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 The correlation between the soft X-ray and near infrared emission from AGN is analysed using composite models by the code SUMA. We find new evidences for differences in ranges of parameters which characterize the NLR of Seyfert galaxies and LINERs. Results obtained by modelling the Einstein and the ROSAT samples of galaxies are in full agreement.
P. E. Campos +2 more
openaire +3 more sources
X-RAY VARIABILITY AND THE INNER REGION IN ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2014 32 pages, 11 figures (9 sub-figures); 4 Tables; 1 appendix; published in the Astrophysical ...
P. Mohan, A. Mangalam
openaire +4 more sources
X-ray Reverberation Observational Modelling in Active Galactic Nuclei [PDF]
Proceedings of Accretion Processes in Cosmic Sources – II — PoS(APCS2018), 2019 X-ray reverberation in Active Galactic Nuclei, believed to be the result of the reprocessing of coronal photons by the underlying accretion disc, has allowed us to probe the properties of the inner-most regions of the accretion flow and the central black hole. Our current model (KYNREFREV) computes the time-dependent reflection spectra of the disc as a
V. Karasa +4 more
openaire +3 more sources
X-ray variability of 104 active galactic nuclei [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractWe have performed a uniform analysis of the power spectrum densities (PSDs) of 104 nearby (z<0.4) active galactic nuclei (AGN) using 209 XMM-Newton/pn observations, including several AGN classes. These PSDs span ≃ 3 decades in temporal frequencies, ranging from minutes to days.
O. González-Martín, Simon Vaughan
openaire +2 more sources
X-ray active galactic nuclei in the core of the Perseus cluster [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 We present a study of the X-ray emission from the nuclei of galaxies observed in the core of the Perseus cluster in a deep exposure with Chandra. Point sources are found coincident with the nuclei of 13 early-type galaxies, as well as the central galaxy NGC1275. This corresponds to all galaxies brighter than M_B = -18 in the Chandra field. All of these
S. Santra +2 more
openaire +4 more sources
The X-Ray Coronae in NuSTAR Bright Active Galactic Nuclei
The Astrophysical Journal, 2022 Abstract We present a systematic and uniform analysis of NuSTAR data of a sample of 60 SWIFT BAT-selected AGNs with 10–78 keV signal-to-noise ratio (S/N) > 50, 10 of which are radio loud. We measure their high-energy cutoff E cut or coronal temperature T e using three different spectral models to ...
Jia-Lai Kang, Jun-Xian Wang
openaire +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
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.
Julian H. Krolik +8 more
openaire +3 more sources
Spatiotemporal Control Over Circadian Rhythms With Light
Medicinal Research Reviews, Volume 45, Issue 3, Page 968-984, May 2025.ABSTRACT Circadian rhythms are endogenous biological oscillators that synchronize internal physiological processes and behaviors with external environmental changes, sustaining homeostasis and health. Disruption of circadian rhythms leads to numerous diseases, including cardiovascular and metabolic diseases, cancer, diabetes, and neurological disorders.
Dušan Kolarski +2 more
wiley +1 more source
Active Galactic Nuclei with High-Resolution X-Ray Spectroscopy
, 2023 Invited review chapter for the book High-Resolution X-Ray Spectroscopy: Instrumentation, Data Analysis, and Science (Eds. C. Bambi and J. Jiang, Springer Singapore, expected in 2023).
Gallo, Luigi C. +2 more
openaire +2 more sources