Results 61 to 70 of about 1,919 (235)
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.
Xavier Barcons +6 more
openaire +3 more sources
Infrared Photovoltaic–Battery Hybrid Systems Enabled by Colloidal Quantum Dots
Chemistry – An Asian Journal, EarlyView.Photovoltaic–battery (PV/B) hybrid systems are key for sustainable energy but face cost and efficiency limits. Colloidal quantum dots (CQDs) enable low‐cost near‐infrared light harvesting, surpassing silicon and III–V PVs. This review analyzes CQD properties, their roles in NIR PVs and batteries, and synthesizes current research to highlight progress ...
Hong Ji +3 more
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
ChemCatChem, EarlyView.Pulsed laser defect engineering in liquid (PUDEL) modifies anisotropic Co3O4 platelets by inducing lattice distortions and defects while enriching {111} surfaces with hydroxyl groups and tunes the catalytic activity of the Co3O4 platelets in electrocatalytic oxygen evolution and thermocatalytic selective oxidation reactions.
Dana Schellenburg +22 more
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 Astrophysical Journal, 2023 We present X-ray spectral analysis of XMM-Newton and Chandra observations in the 31.3 deg ^2 Stripe-82X (S82X) field. Of the 6181 unique X-ray sources in this field, we analyze a sample of 2937 candidate active galactic nuclei (AGNs) with solid redshifts
Alessandro Peca +13 more
doaj +1 more source
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
Effect of Background Magnetic Field on Ion Weibel Instability With High‐Intensity Short‐Pulse Lasers
Contributions to Plasma Physics, EarlyView.ABSTRACT The effect of finite background magnetic field on magnetic field amplification by Weibel instability using high‐intensity short‐pulse lasers is investigated. We consider Weibel instability for counter‐streaming sub‐relativistic plasma flows generated by shooting pure carbon targets with short‐pulse lasers.
Taiki Jikei +3 more
wiley +1 more source
On the Properties of X-Ray Corona in Seyfert 1 Galaxies
The Astrophysical JournalWe carried out a uniform and systematic analysis of a sample of 112 nearby bright Seyfert 1 type active galactic nuclei, the observations of which were carried out by the Nuclear Spectroscopic Telescope Array between 2013 August and 2022 May.
Indrani Pal +6 more
doaj +1 more source
AGN STORM 2. III. A NICER View of the Variable X-Ray Obscurer in Mrk 817
The Astrophysical Journal, 2023 The AGN STORM 2 Collaboration targeted the Seyfert 1 galaxy Mrk 817 for a year-long multiwavelength, coordinated reverberation mapping campaign including Hubble Space Telescope, Swift, XMM-Newton, NICER, and ground-based observatories. Early observations
Ethan R. Partington +48 more
doaj +1 more source