Results 61 to 70 of about 8,662 (194)

Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei

Astronomische Nachrichten, Volume 347, Issue 5, June 2026.
ABSTRACT Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre‐existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources.
Patrik Milán Veres
wiley   +1 more source

4MOST Consortium Survey 6: Active galactic nuclei [PDF]

, 2019
X-ray and mid-infrared emission are signposts of the accretion of matter onto the supermassive black holes that reside at the centres of most galaxies.
McMahon, R., Wisotzki, L., Worseck, G., Shanks, T., Rosario, D., Boller, T., Dwelly, T., Fotopoulou, S., Croom, S., Steinmetz, M., Alexander, D., Finoguenov, A., Comparat, J., Alexander, D. A., Merloni, A., Krumpe, M., Salvato, M., Banerji, M., Nandra, K., Schwope, A., Lamer, G.   +20 more
core   +1 more source

Kinematics and Collimation of the Two-sided Jets in NGC 4261: VLBI Study on Subparsec Scales

The Astrophysical Journal, 2023
We report multifrequency VLBI studies of the subparsec scale structure of the two-sided jets in the nearby radio galaxy NGC 4261. Our analyses include new observations using the source frequency phase referencing technique with the Very Long Baseline ...
Xi Yan, Ru-Sen Lu, Wu Jiang, Thomas P. Krichbaum, Zhi-Qiang Shen   +4 more
doaj   +1 more source

Early evolutionary history of the seed

Biological 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, Alan R. T. Spencer, Jason Hilton   +2 more
wiley   +1 more source

First results from high redshift quasar searches in VIKING [PDF]

, 2012
This thesis presents the discovery of the first luminous z & 6.5 quasars in the VISTA kilo-degree Infrared Galaxy Survey (VIKING). After some basic quality control, quasar selection is investigated via use of initial data supplementedwith ...
Findlay, Joseph
core  

Radio Emission from High-redshift Active Galactic Nuclei in the JADES and CEERS Surveys

The Astronomical Journal
Recent calculations indicate that radio emission from quasars at z ∼ 6–7 could be detected at much earlier stages of evolution, at z ∼ 14–15, by the Next-Generation Very Large Array (ngVLA) and the Square Kilometer Array (SKA).
Muhammad A. Latif, Ammara Aftab, Daniel J. Whalen   +2 more
doaj   +1 more source

Mapping Quartz and Feldspar Areal Abundance and Grain Sizes Using Integrated VTIR Data

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Mineral dust is sourced from arid regions around the globe, and its composition impacts regional and global environments by affecting radiation balance, cloud formation, nutrient deposition, and snowmelt. As such, mineral dust plays a key role in Earth's energy and biogeochemical budgets.
Kathleen Grant, Philip G. Brodrick, Carlos Pérez Garcia‐Pando, María Gonçalves Ageitos, Aaron J. Celestian, A. Joshua West   +5 more
wiley   +1 more source

ReveaLLAGN 1: JWST Emission-line Spectra Reveal Low-luminosity Active Galactic Nucleus with Ultraviolet-deficient Spectral Energy Distributions and Warm Molecular Gas

The Astrophysical Journal
We present near- and mid-infrared spectra of eight low-luminosity active galactic nuclei (LLAGN), spanning nearly 4 orders of magnitude in black hole mass and Eddington ratio, obtained with JWST/NIRSpec and MIRI as part of the ReveaLLAGN program, along ...
Kameron Goold, Anil Seth, Mallory Molina, David Ohlson, Nischal Acharya, Torsten Böker, Antoine Dumont, Michael Eracleous, Juan Antonio Fernández-Ontiveros, Elena Gallo, Andy D. Goulding, Jenny E. Greene, Luis C. Ho, Nadine Neumayer, Richard M. Plotkin, Almudena Prieto, Jessie C. Runnoe, Shobita Satyapal, Glenn van de Ven, Jonelle L. Walsh, Feng Yuan, Anja Feldmeier-Krause, Kayhan Gültekin, Nora Lützgendorf   +23 more
doaj   +1 more source

Third Generation Genome Sequencing of the Endobacterium Corynebacterium kroppenstedtii subsp. demodicis Reveals Details of Its Microbe‐Host‐Interaction With the Most Complex Human Commensal, Demodex folliculorum

Environmental Microbiology Reports, Volume 18, Issue 3, June 2026.
The symbiotic interaction between Demodex folliculorum and Corynebacterium kroppenstedtii subsp. demodicis. Created by the author based on genomic and functional analyses presented in this work. The tripartite interaction between the human host, the mite Demodex folliculorum, and its endosymbiont Corynebacterium kroppenstedtii subsp. demodicis.
T. Steegmüller, S. Walch, S. Gschwendtner, A. Klingl, L. E. French, M. Flaig, B. M. Clanner‐Engelshofen   +6 more
wiley   +1 more source

Relation between millimeter wavelengths emission and high-energy emission for active galactic nuclei [PDF]

, 1998
After comparing the Aux densities of a sample of active galactic nuclei detected fly energetic gamma-ray experiment telescope at 90 and 230 GHz with the gamma-ray emissions detected by Compton Gamma-nay Observatory and x-ray emission, a strong ...
Huang, LH, Jiang, DR, Cao, XW
core