Results 131 to 140 of about 37,389 (216)
Continuum Reverberation Mapping of 18 Active Galactic Nuclei over 4 Yr
The Astrophysical JournalContinuum reverberation mapping probes the size scale of the optical continuum-emitting region in active galactic nuclei (AGN). The source of this emission has long been thought to originate from the accretion disk, but recent studies suggest the broad ...
Jake A. Miller +6 more
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A Systematic Search for Active Galactic Nucleus Flares in ZTF Data Release 23
The Astrophysical Journal Supplement SeriesActive galactic nuclei (AGNs) are known to exhibit stochastic variability across a wide range of timescales and wavelengths. AGN flares are extreme outbursts that deviate from this typical behavior and may trace a range of energetic physical processes ...
Lei He +15 more
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Precursors in tidal disruption events: Repeating, fast, and active galactic nucleus-hosted TDEs
Astronomy & AstrophysicsContext. Tidal disruption events (TDEs) are rare transients that provide important insights into the physics of galactic nuclei. A recently identified feature in their optical light curves is the presence of early bump-like structures (precursors) that ...
Veres Patrik Milán
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The Contribution of Turbulent Active Galactic Nucleus Coronae to the Diffuse Neutrino Flux
The Astrophysical JournalActive galactic nuclei (AGN) can accelerate protons to energies of ∼10–100 TeV, with secondary production of high-energy neutrinos. If the acceleration is driven by magnetized turbulence, the main properties of the resulting proton and neutrino spectra ...
Damiano F. G. Fiorillo +4 more
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Active Galactic Nucleus Activity in Giant, Low Surface Brightness Galaxies
The Astronomical Journal, 1998 A search of large, H I–rich disk galaxies finds a significantly higher fraction of low-luminosity active galactic nucleus (AGN) signatures compared with other late-type galaxies. Approximately half the galaxies selected in this sample have AGN-like behavior in their cores; the rest have H II nuclei resulting from simple star formation.
openaire +1 more source
Dynamical Friction Models for Black Hole Binary Formation in Active Galactic Nucleus Disks
The Astrophysical JournalStellar-mass black holes (sBHs) embedded in gaseous disks of active galactic nuclei (AGN) can be important sources of detectable gravitational radiation for LIGO/Virgo when they form binaries and coalesce due to orbital decay. In this paper, we study the
Kecheng Qian, Jiaru Li, Dong Lai
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The Astrophysical JournalIn this paper, an oversimplified model is proposed to test the effects of intrinsic active galactic nucleus (AGN) variability on expected optical quasiperiodic oscillations (QPOs) related to subparsec binary black hole systems (BBHs) in broad-line AGN ...
XueGuang Zhang
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The Astrophysical JournalThe origin of the cool-core (CC) and non-cool-core (NCC) dichotomy of galaxy clusters remains uncertain. Previous simulations have found that cluster mergers are effective in destroying CCs but fail to prevent overcooling in cluster cores when radiative ...
Shuang-Shuang Chen +5 more
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ACTIVE GALACTIC NUCLEUS OBSCURATION FROM WINDS: FROM DUSTY INFRARED-DRIVEN TO WARM AND X-RAY PHOTOIONIZED. [PDF]
Astrophys J, 2012 Dorodnitsyn A, Kallman T.
europepmc +1 more source