Results 81 to 90 of about 47,708 (236)

Revealing the Accretion Flow in M87*: Insights from Faraday Rotation

open access: yesThe Astrophysical Journal
The Faraday rotation measure (RM) is a commonly used tool to trace electron number density and magnetic fields in hot accretion flows, particularly in low-luminosity accreting supermassive black holes.
Constanza Echiburú-Trujillo   +1 more
doaj   +1 more source

Quasars in the 4D Eigenvector 1 Context: A stroll down memory lane [PDF]

open access: yes, 2015
Recently some pessimism has been expressed about our lack of progress in understanding quasars over the 50+ year since their discovery. It is worthwhile to look back at some of the progress that has been made - but still lies under the radar - perhaps ...
Marziani, Paola, Sulentic, Jack W.
core   +3 more sources

Early evolutionary history of the seed

open access: yesBiological Reviews, Volume 101, Issue 3, Page 1511-1553, June 2026.
ABSTRACT The seed is an essential stage in the life history of gymnospermous and angiospermous plants, facilitating both their survival and dispersal. We reappraise knowledge of the evolutionary history of the gymnospermous seed, from its origin in the late Devonian through to the well‐known end‐Permian extinctions – an interval encompassing the ...
Richard M. Bateman   +2 more
wiley   +1 more source

Radio Sources in Low-Luminosity Active Galactic Nuclei. II. Very Long Baseline Interferometry Detections of Compact Radio Cores and Jets in a Sample of LINERs [PDF]

open access: yes, 2000
We have used the VLBA at 5 GHz to observe all galaxies with nuclear radio flux densities above 3.5 mJy found in a VLA survey at 15 GHz of a sample of nearby LINER galaxies.
H. Falcke   +2 more
semanticscholar   +1 more source

A high-frequency radio survey of low-luminosity active galactic nuclei [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2005
15 pages, 5 figures.
Doi, A.   +4 more
openaire   +2 more sources

Controlling 3D Contractility via Engineered Fibrous Hydrogel Composites

open access: yesAdvanced Functional Materials, Volume 36, Issue 36, 4 May 2026.
A tunable composite contractile assembly (CCA) is developed that can permit or resist contraction without changing cell‐adhesion and density, unlike collagen whose inherent coupling of these ECM cues limits its use as a platform in contractility studies.
Karen L. Xu   +7 more
wiley   +1 more source

XRISM/Resolve Reveals the Complex Iron Structure of NGC 7213: Evidence for Radial Stratification between Inner Disk and Broad-line Region

open access: yesThe Astrophysical Journal Letters
We present the first high-resolution X-ray spectrum of NGC 7213 obtained with XRISM/Resolve, supported by simultaneous XMM-Newton, NuSTAR, and SOAR optical data.
E. Kammoun   +51 more
doaj   +1 more source

Low-Luminosity Active Galactic Nuclei at the Highest Resolution: Jets or Accretion Flows? [PDF]

open access: yes, 2003
Six low-luminosity active galactic nuclei (AGNs) have been imaged at multiple frequencies from 1.7 to 43 GHz (2.3-15 GHz for three of the galaxies) using the Very Long Baseline Array.
James M. Anderson, J. Ulvestad, L. Ho
semanticscholar   +1 more source

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

open access: yesAdvanced Functional Materials, Volume 36, Issue 27, 2 April 2026.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha   +18 more
wiley   +1 more source

Multiwavelength Constraints on the Local Black Hole Occupation Fraction

open access: yesThe Astrophysical Journal
The fraction of dwarf galaxies hosting central, intermediate-mass black holes (IMBHs) at low redshifts is an important observational probe of black hole seeding at high redshift.
Colin J. Burke   +3 more
doaj   +1 more source

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