Results 121 to 130 of about 80,758 (270)
A Catalog of Broad Hα and Hβ Active Galactic Nuclei in MaNGA
The Astrophysical JournalBroad H α and H β emission lines (FWHM > 1000 km s ^−1 ) are incredibly efficient tracers of the high-velocity clouds encircling active galactic nuclei (AGNs).
James Negus +2 more
doaj +1 more source
Earth and Space Science, Volume 13, Issue 3, March 2026.Abstract The Bonneville Salt Flats (BSF) in northwestern Utah, USA, has experienced changes in area, thickness, and hydrology over the past century. This study investigates the relationship between multispectral Halite Index (HI) values, which are sensitive to halite moisture content, from Landsat and Sentinel‐2 imagery and groundwater depth (GWD ...
Mark Radwin +2 more
wiley +1 more source
VARIABILITY OF ACTIVE GALACTIC NUCLEI [PDF]
, 2001 Continuum and emission-line variability of active galactic nuclei provides a powerful probe of microarcsecond scale structures in the central regions of these sources. In this contribution, we review basic concepts and methodologies used in analyzing AGN variability.
openaire +2 more sources
Gamma rays from active galactic nuclei [PDF]
The general properties of Active Galactic Nuclei (AGN) and quasars are reviewed with emphasis on their continuum spectral emission. Two general classes of models for the continuum are outlined and critically reviewed in view of the impending GRO (Gamma ...
Kazanas, Demosthenes
core +1 more source
The QPO in RE J1034+396 Originates in the Hot Corona
The Astrophysical JournalRE J1034+396 is one of the few active galactic nuclei (AGNs) with a significant quasiperiodic oscillation (QPO). The QPO has been observed in over 1 Ms of XMM-Newton observations spanning over a decade. We investigate the power spectral density function (
Chloe S. Taylor +2 more
doaj +1 more source
The OPTX Project: Comparing the Optical and X-Ray Spectral Properties of Active Galactic Nuclei [PDF]
, 2009 Laura Trouille, A. J. Barger
openalex +1 more source
A Thermodynamic Framework for Turing‐Type Instabilities in Porous Media: Part I Theory
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.Abstract Pattern formation in geological materials is commonly described using analogies to Turing‐type reaction–diffusion systems, yet a unifying thermodynamic explanation remains elusive. Here we develop a multiscale, thermodynamically consistent framework for pattern‐forming instabilities in porous media undergoing coupled thermo–hydro–mechanical ...
Klaus Regenauer‐Lieb +5 more
wiley +1 more source
Continuum Variability of Active Galactic Nuclei in the Optical–Ultraviolet Range [PDF]
, 2001 Dario Trevese +2 more
openalex +1 more source
A Thermodynamic Framework for Turing‐Type Instabilities in Porous Media: Part II Applications
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.Abstract Compaction bands, desiccation cracks, and melt segregation structures are geological patterns relying on the same fundamental manifestations of a universal Turing‐type instability mechanism, as predicted by the thermodynamically consistent reaction–cross‐diffusion framework developed in Part I (Regenauer‐Lieb et al., 2025, https://doi.org/10 ...
Klaus Regenauer‐Lieb +5 more
wiley +1 more source
The Astrophysical JournalWe present Stokes I continuum analysis for a volume-limited sample (
Andrew J. Sargent +7 more
doaj +1 more source