Results 91 to 100 of about 643 (219)
Low-luminosity accretion in black hole X-ray binaries and active galactic nuclei [PDF]
Astrophysics and Space Science, 2005 At luminosities below a few percent of Eddington, accreting black holes switch to a hard spectral state which is very different from the soft blackbody-like spectral state that is found at higher luminosities. The hard state is well-described by a two-temperature, optically thin, geometrically thick, advection-dominated accretion flow (ADAF) in which ...
openaire +3 more sources
Estimation of Central Black Hole Masses in Low-Luminosity Active Galactic Nuclei [PDF]
Publications of the Astronomical Society of Japan, 2001 Abstract We analyzed six low-luminosity active galactic nuclei (hereafter LLAGNs), which consist of two bright LINERs (low-ionization nuclear emission line region) with broad H$ \alpha$, and of four bright low-luminosity Seyferts observed by the X-ray satellite ASCA.
Hisamitsu Awaki +3 more
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One‐Size‐Fits‐All: A Universal Binding Site for Single‐Layer Metal Cluster Self‐Assembly
Advanced Science, Volume 12, Issue 37, October 6, 2025.A universal strategy enables the formation of single‐layer metal clusters (SLMC) across 21 elements by harnessing vacancy defects as binding sites. Crucially, synthesis occurs without reactive species, preventing site passivation and ensuring strong metal–surface bonding.
Emerson C. Kohlrausch +16 more
wiley +1 more source
Loss of PI3Kδ Activity Drives Autoimmune Colitis by Impairing Extrathymic Treg Differentiation
European Journal of Immunology, Volume 55, Issue 10, October 2025.Mice with inactivated PI3Kδ develop colitis, reminiscent of immune‐related adverse effects observed in human patients treated with PI3Kδ inhibitors. We demonstrate that loss of PI3Kδ activity abrogates the Helios− peripherally induced Treg (pTreg) population in the mouse colon, resulting in inflammation and tissue damage that Helios+ thymic Tregs fail ...
Ee Lyn Lim +4 more
wiley +1 more source
The Astrophysical JournalWe report on follow-up observations of the Seyfert 1.9 galaxy IC 3599 with the NASA Neil Gehrels Swift mission. The detection of a second X-ray outburst in 2010 by Swift after the first discovery of a bright X-ray outburst in 1990 by ROSAT led to the ...
Dirk Grupe, S. Komossa, Salem Wolsing
doaj +1 more source
On the Formation and Dynamics of Micro Dew Droplets on Grass: the Role of Epicuticular Wax
Small, Volume 21, Issue 39, October 2, 2025.Despite their familiar appearance, dew droplets on grass emerge from a finely tuned interplay between environmental factors and surface architecture. Microscale analysis uncovers a key role of epicuticular wax micromorphologies in promoting the nucleation and growth of spherical droplets on the biphilic leaves of wheatgrass.
Bashra Mahamed +6 more
wiley +1 more source
Fermi-LAT Detection of the Low-luminosity Radio Galaxy NGC 4278 during the LHAASO Campaign
The Astrophysical Journal LettersWe present a study of the high-energy properties of the compact symmetric object NGC 4278, recently associated with a TeV source by the Large High Altitude Air Shower Observatory (LHAASO) collaboration.
Ettore Bronzini +3 more
doaj +1 more source
The complex structure of low-luminosity active galactic nuclei: NGC 4579 [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 We have modelled the low-luminosity active galactic nucleus (AGN) NGC 4579 by explaining both the continuum and the line spectra observed with different apertures. It was found that the nuclear emission is dominated by an AGN such that the flux from the active centre (AC) is relatively low compared with that of the narrow emission-line region (NLR) of ...
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“Lab‐Quakes”: Quantifying the Complete Energy Budget of High‐Pressure Laboratory Failure
AGU Advances, Volume 6, Issue 5, October 2025.Abstract Understanding the interplay of various energy sinks during seismic fault slip is essential for advancing earthquake physics and improving hazard assessment. However, quantifying the energy consumed by major dissipative processes remains a challenge.
Daniel Ortega‐Arroyo +7 more
wiley +1 more source