Results 51 to 60 of about 23,810 (131)
The Astrophysical JournalAccretion disks are highly unstable to magnetic instabilities driven by shear flow, where classically, the axisymmetric, weak-field magnetorotational instability (MRI) has received much attention through local WKB approximations.
Nicolas Brughmans +2 more
doaj +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
Direct Formation of Supermassive Black Holes via Multi-Scale Gas Inflows in Galaxy Mergers [PDF]
, 2009 Observations of distant bright quasars suggest that billion solar mass supermassive black holes (SMBHs) were already in place less than a billion years after the Big Bang.
A Escala +32 more
core +3 more sources
On the Accretion Origin of a Vast Extended Stellar Disk around the Andromeda Galaxy [PDF]
The Astrophysical Journal, 2005 We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2800 stars with the Keck/DEIMOS spectrograph. The stellar structure spans radii from 15 kpc out to ~40 kpc, with detections out to R ~ 70 kpc.
Ibata, R +5 more
openaire +3 more sources
Gas-phase Metallicity Profiles of Star-forming Galaxies in the Modified Accretion Disk Framework
The Astrophysical Journal, 2022 Abstract Simulations indicate that the inflow of gas of star-forming galaxies is almost coplanar and corotating with the gas disk, and that the outflow of gas driven by stellar winds and/or supernova explosions is preferentially perpendicular to the disk.
Enci Wang, Simon J. Lilly
openaire +3 more sources
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
Different Influence of Gas Accretion on the Evolution of Star-forming and Non-star-forming Galaxies
The Astrophysical JournalUsing integral field spectroscopic data from the Mapping Nearby Galaxies at Apache Point Observatory survey, we investigate the spatially resolved properties and empirical relations of a star-forming galaxy and a non-star-forming galaxy hosting ...
Min Bao, Wenlong Zhao, Qirong Yuan
doaj +1 more source
Intermediate-mass black hole incubators
Astronomy & AstrophysicsContext. The stellar dynamical evolution of massive star clusters formed during starburst periods leads to the segregation of ≳104 M⊙ stellar-mass black hole sub-clusters in their centres.
Haas Jaroslav +2 more
doaj +1 more source
Tidal disruption flares as the source of ultra-high energy cosmic rays
EPJ Web of Conferences, 2012 The optical spectral energy distributions of two tidal disruption flares identified by van Velzen et al. (2011) in archival SDSS data, are found to be well-fit by a thin-accretion-disk model.
Farrar G.R.
doaj +1 more source
On Estimating the Mass of Keplerian Accretion Disks in H2O Maser Galaxies [PDF]
The Astrophysical Journal, 2018 Abstract H2O maser disks with Keplerian rotation in active galactic nuclei offer a clean way to determine accurate black hole mass and the Hubble constant. An important assumption made in using a Keplerian H2O maser disk for measuring black hole mass and the Hubble constant is that the disk mass is negligible compared to the black hole ...
C. Y. Kuo +5 more
openaire +2 more sources