Results 101 to 110 of about 63,914 (268)
Fortschritte der Physik, Volume 74, Issue 4, April 2026.Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley +1 more source
Testing Physical and Phenomenological Models to Explain the Origin of the Soft Excess in Type-1 AGN
The Astrophysical JournalActive galactic nuclei (AGN) exhibit an excess of X-ray emission below ∼1 keV compared to the 2–10 keV continuum extrapolation. This feature is commonly named soft excess, and its origin is currently debated for type-1 AGN.
César Ivan Victoria-Ceballos +5 more
doaj +1 more source
[C II] emission from galactic nuclei in the presence of X-rays
, 2015 The luminosity of [C II] is used to probe the star formation rate in galaxies, but the correlation breaks down in some active galactic nuclei (AGNs). Models of the [C II] emission from galactic nuclei do not include the influence of X-rays on the carbon ...
Langer, William D., Pineda, Jorge L.
core +1 more source
THE NuSTAR EXTRAGALACTIC SURVEYS: THE NUMBER COUNTS OF ACTIVE GALACTIC NUCLEI AND THE RESOLVED FRACTION OF THE COSMIC X-RAY BACKGROUND [PDF]
, 2015 We present the 3–8 keV and 8–24 keV number counts of active galactic nuclei (AGNs) identified in the Nuclear Spectroscopic Telescope Array (NuSTAR) extragalactic surveys.
F. Harrison +49 more
semanticscholar +1 more source
The Effects of Carbonate Precipitation on the Physical Properties of Basalt
AGU Advances, Volume 7, Issue 2, April 2026.Abstract To avoid the negative consequences of climate change, there is an urgent need to remove carbon dioxide from the atmosphere. Carbon mineralization—the conversion of injected CO2 into stable carbonate minerals—offers a promising pathway for large‐scale, permanent geologic storage. While projects such as CarbFix have demonstrated its feasibility,
Jonathan Simpson +4 more
wiley +1 more source
The Astrophysical JournalWe present a time-resolved X-ray spectral analysis of the warm absorbers in the Seyfert galaxy NGC 4051, which has an active galactic nucleus (AGN), using observations from the Neutron Star Interior Composition Explorer (NICER).
Dev R. Sadaula +2 more
doaj +1 more source
A High Fraction of Heavily X-Ray-obscured Active Galactic Nuclei
The Astrophysical Journal, 2023 We present new estimates on the fraction of heavily X-ray-obscured, Compton-thick (CT) active galactic nuclei (AGNs) out to a redshift of z ≤ 0.8. From a sample of 540 AGNs selected by mid-infrared (MIR) properties in observed X-ray survey fields, we ...
Christopher M. Carroll +7 more
doaj +1 more source
The Cosmic Evolution of Hard X-Ray-selected Active Galactic Nuclei [PDF]
, 2004 We use highly spectroscopically complete deep and wide-area Chandra surveys to determine the cosmic evolution of hard X-ray–selected active galactic nuclei (AGNs).
A. Barger +8 more
semanticscholar +1 more source
Substituent‐Based Modulation of Self‐Assembly and Immunogenicity of Amphipathic Peptides
Advanced Science, Volume 13, Issue 18, 27 March 2026.This study systematically investigates how positional and subtle changes, such as substituents on the phenyl ring attached to short amphipathic peptides, influence their self‐assembly, fibril morphology, and immunogenic responses. ABSTRACT Self‐assembled peptide‐based biomaterials provide versatile platforms for biomedical uses, featuring customizable ...
Anirban Das +13 more
wiley +1 more source
The Role of Environment in Triggering Active Galactic Nuclei—Evidence for a Change at z ∼ 1
The Astrophysical JournalWhat triggers active galactic nuclei (AGN) in some galaxies and what role this brief period of activity plays in the overall evolution of galaxies are still open questions. This paper explores whether or not the local, on scales of ≈1 Mpc, galaxy density
Jason R. Reeves +4 more
doaj +1 more source