Results 131 to 140 of about 289,816 (297)
A Long-term Study of Mrk 50: Appearance and Disappearance of Soft Excess
The Astrophysical JournalWe present an extensive temporal and spectral study of the Seyfert 1 AGN Mrk 50 using 15 yr (2007–2022) of multiwavelength observations from XMM-Newton, Swift, and NuSTAR for the first time.
Narendranath Layek +3 more
doaj +1 more source
Accretion Flows in X--Ray Binaries and Active Galactic Nuclei [PDF]
arXiv, 2001 Hard X-ray emission is ubiquitous in accreting black holes, both in Galactic binary systems and in Active Galactic Nuclei. I review the different spectra which can be seen from these systems, and possible ways of producing this emission. X-ray reflection should give an observational test of these scenarios, but we need better models before this can ...
arxiv
The ratio of X-ray-to-optical luminosity for active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 1984 On montre que le renforcement apparent du rapport moyen des luminosites RX a optique des noyaux de Seyfert 1, en comparaison avec les QSO radio calmes, peut etre largement, sinon totalement, du a un rougissement interne.
CHENG FZ +3 more
openaire +3 more sources
Mass Spectrometry Reviews, Volume 44, Issue 3, Page 213-453, May/June 2025.Abstract The use of matrix‐assisted laser desorption/ionization (MALDI) mass spectrometry for the analysis of carbohydrates and glycoconjugates is a well‐established technique and this review is the 12th update of the original article published in 1999 and brings coverage of the literature to the end of 2022.
David J. Harvey
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
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 hard X-ray luminosity function of high-redshift (3 < z ≲ 5) active galactic nuclei [PDF]
, 2014 We present the hard-band ($2-10\,\mathrm{keV}$) X-ray luminosity function (HXLF) of $0.5-2\,\mathrm{keV}$ band selected AGN at high redshift. We have assembled a sample of 141 AGN at $3 10^{44}\mathrm{erg\,s^{-1}}}$) obscured AGN fraction from $z=0$ to ...
F. Vito +6 more
semanticscholar +1 more source
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
The Astrophysical JournalWe present an enhanced version of the publicly available Stripe 82X catalog (S82-XL), featuring a comprehensive set of 22,737 unique X-ray point sources identified with a significance ≳4 σ .
Alessandro Peca +11 more
doaj +1 more source
The Complex X-Ray Obscuration Environment in the Radio-loud Type 2 Quasar 3C 223
The Astrophysical Journal, 2023 3C 223 is a radio-loud, Type 2 quasar at z = 0.1365 with an intriguing X-ray Multi-mirror Mission (XMM)-Newton spectrum that implicated it as a rare, Compton-thick ( N _H ≳ 1.25 × 10 ^24 cm ^−2 ) active galactic nucleus (AGN). We obtained contemporaneous
Stephanie M. LaMassa +6 more
doaj +1 more source