Results 51 to 60 of about 321 (139)
FORGE'd in FIRE III: The IMF in Quasar Accretion Disks from STARFORGE
The Open Journal of AstrophysicsRecently, we demonstrated self-consistent formation of strongly-magnetized quasar accretion disks (QADs) from cosmological radiation-magnetohydrodynamic-thermochemical galaxy-star formation simulations, including the full STARFORGE physics shown ...
Philip F. Hopkins +5 more
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Disk Assembly of the Milky Way Suggested from the Time-resolved Chemical Abundance
The Astrophysical JournalBoth simulations and observations suggest that the disk assembly of galaxies is governed by the interplay between coplanar gas inflow, ex-planar gas outflow, and in situ star formation on the disk, known as the leaky accretion disk.
Enci Wang +3 more
doaj +1 more source
Shock Waves in the Magnetic Reconnection in the Flares on the Accretion Disk of the Sgr A*
The Astrophysical JournalSgr A* often shows bright, episodic flares observationally, but the mechanism of the flares' intermittent brightening is not very clear. Many people believe the flares may be formed by the nonthermal particles, which can be a consequence of the magnetic ...
Tian-Le Zhao +3 more
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Probing the History of the Galaxy Assembly of the Counterrotating Disk Galaxy PGC 66551
The Astrophysical JournalStellar counterrotation in disk galaxies directly relates to the complex phenomenon of the disk mass assembly believed to be driven by external processes, such as accretion and mergers.
Ivan Yu. Katkov +6 more
doaj +1 more source
A Sandwich Model for Changing-look Active Galactic Nuclei
The Astrophysical JournalThe spectral variability of changing-look active galactic nuclei (CL-AGNs) occurred on timescales of years to tens of years, posing a significant challenge to the standard thin disk model. In this work, we propose a sandwich model, including an optically
Qian-Qi Ma +6 more
doaj +1 more source
The Astrophysical Journal LettersQuasiperiodic eruptions (QPEs) are recurrent soft X-ray flares from galactic nuclei, but their origin remains uncertain. The delayed ultraviolet (UV) counterpart detected in ZTF19acnskyy provides a new constraint on viable models.
Na Wang +4 more
doaj +1 more source
The Reliability of Accretion Disk Inclination Derived from X-Ray Spectroscopy of Active Galaxies
The Astrophysical JournalThe inclination angle of substructures in active galaxies gives insights into physical components from scales of the vicinity of the central black hole to the entire host galaxy. We use the self-consistent reflection spectral model RELXILL to measure the
Rong Du +3 more
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The Lifetimes of High-redshift Quasars Suggest Magnetic Disk Support
The Astrophysical JournalIt has recently been suggested that a variety of data on active galactic nuclei (AGN) can be explained if AGN disks are supported against gravitational fragmentation by magnetic fields that are advected into the disk from the surrounding galaxy.
Jarrett Johnson +4 more
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Directly Tracking the Rebrightening of a Supermassive Black Hole Accretion Disk
The Astrophysical JournalAccretion onto supermassive black holes (SMBHs) powers the most luminous persistent sources in the Universe, the so-called active galactic nuclei, whose emission is characterized by two distinct spectral components: thermal optical/ultraviolet (UV ...
Riccardo Middei +14 more
doaj +1 more source
The Santa Barbara Binary−disk Code Comparison
The Astrophysical JournalWe have performed numerical calculations of a binary interacting with a gas disk, using 11 different numerical methods and a standard binary−disk setup.
Paul C. Duffell +15 more
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