Results 91 to 100 of about 55,785 (258)
The Astrophysical Journal, 2023 We perform 3D radiation hydrodynamic local shearing-box simulations to study the outcome of gravitational instability (GI) in optically thick active galactic nuclei (AGNs) accretion disks.
Yi-Xian Chen +3 more
doaj +1 more source
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
, 1999 Recent high resolution near infrared (HST-NICMOS) and mm-interferometric imaging have revealed dense gas and dust accretion disks in nearby ultra-luminous galactic nuclei.
Scoville, N. Z.
core
Lopsided spiral galaxies: evidence for gas accretion [PDF]
, 2005 Final version after language editionWe quantify the degree of lopsidedness for a sample of 149 galaxies observed in the near-infrared from the OSUBGS sample, and try to explain the physical origin for the observed disk lopsidedness.
Puerari, I. +11 more
core +1 more source
Electron Heating in the Transrelativistic Perpendicular Shocks of Tilted Accretion Flows
The Astrophysical JournalGeneral relativistic magnetohydrodynamic (GRMHD) simulations of black hole tilted disks—where the angular momentum of the accretion flow at large distances is misaligned with respect to the black hole spin—commonly display standing shocks within a few to
Lorenzo Sironi, Aaron Tran
doaj +1 more source
New evidence for halo gas accretion onto disk galaxies [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractStudies of the halo gas in the Milky Way and in nearby spiral galaxies show the presence of gas complexes that cannot be reconciled with an internal (galactic fountain) origin and are direct evidence of gas accretion. Estimating gas accretion rates from these features consistently gives values, which are one order of magnitude lower than what ...
openaire +3 more sources
Subterranean environments contribute to three‐quarters of classified ecosystem services
Biological Reviews, Volume 101, Issue 3, Page 1582-1605, June 2026.ABSTRACT Beneath the Earth's surface lies a network of interconnected caves, voids, and systems of fissures forming in rocks of sedimentary, igneous, or metamorphic origin. Although largely inaccessible to humans, this hidden realm supports and regulates services critical to ecological health and human well‐being.
Stefano Mammola +30 more
wiley +1 more source
Accretion-generated rings: coplanar and noncoplanar structures
, 2018 The most of known rings in galaxy discs are formed under action of ``classical'' dynamical mechanisms like bar resonance or head-on collision with satellite. However a small fraction of galactic rings can be explained by capture of external matter like
Sil'chenko Olga +5 more
core +1 more source
THE DESTRUCTION OF THIN STELLAR DISKS VIA COSMOLOGICALLY COMMON SATELLITE ACCRETION EVENTS [PDF]
, 2008 Most Galaxy-sized systems (Mhost ≃ 1012 M☉) in the ΛCDM cosmology are expected to have interacted with at least one satellite with a total mass Msat ≃ 1011 M☉ ≃ 3Mdisk in the past 8 Gyr. Analytic and numerical investigations suggest that this is the most
C. Purcell, S. Kazantzidis, J. Bullock
semanticscholar +1 more source
Application of the Disk Instability Model to All Quasiperiodic Eruptions
The Astrophysical Journal, 2023 After the first quasiperiodic eruption (QPE; GSN 069) was reported in 2019, four other sources have been identified as a QPE or a candidate. However, the physics behind QPEs is still unclear, although several models have been proposed.
Xin Pan, Shuang-Liang Li, Xinwu Cao
doaj +1 more source