Results 171 to 180 of about 238,671 (290)

A Two-zone Accretion Disk in the Changing-look Active Galactic Nucleus 1ES 1927+654: Physical Implications for Tidal Disruption Events and Super-Eddington Accretion

The Astrophysical Journal
The properties of slim accretion disks, while crucial for our understanding of black hole growth, have yet to be studied extensively observationally. We analyze the multiepoch broadband spectral energy distribution of the changing-look active galactic ...
Ruancun Li, Luis C. Ho, Claudio Ricci, Benny Trakhtenbrot   +3 more
doaj   +1 more source

Penrose pair production as a power source of quasars and active galactic nuclei

, 1979
M. Kafatos, D. Leiter
openalex   +1 more source

Cosmic X-ray Background from Early Active Galactic Nuclei [PDF]

, 1989
A. A. Zdziarski
openalex   +1 more source

Thick tori around active galactic nuclei: a comparison of model predictions with observations of the infrared continuum and silicate features [PDF]

, 1994
G. L. Granato, L. Danese
openalex   +1 more source

First Observational Evidence for an Interconnected Evolution between Time Lag and QPO Frequency among AGNs

The Astrophysical Journal Letters
Quasiperiodic oscillations (QPOs) have been widely observed in black hole X-ray binaries (BHBs), which often exhibit significant X-ray variations. Extensive research has explored the long-term evolution of the properties of QPOs in BHBs.
Ruisong Xia, Hao Liu, Yongquan Xue
doaj   +1 more source

Cosmic ray feedback in galaxies and galaxy clusters: A pedagogical introduction and a topical review of the acceleration, transport, observables, and dynamical impact of cosmic rays. [PDF]

Astron Astrophys Rev, 2023
Ruszkowski M, Pfrommer C.
europepmc   +1 more source

Implications of particle acceleration in active galactic nuclei for cosmic rays and high energy neutrino astronomy [PDF]

, 1994
Á. Szabó, R. J. Protheroe
openalex   +1 more source

Strong Amplitude Modulation of Hard-band X-Ray Quasiperiodic Oscillation with Soft-band Flux in RE J1034+396

The Astrophysical Journal
The X-ray quasiperiodic oscillation (QPO) is a remarkable form of variability in systems of compact object accretion. RE J1034+396, harboring the most significant X-ray QPO in active galactic nuclei (AGNs), is the most noteworthy source for in-depth ...
Ruisong Xia, Hao Liu, Yongquan Xue
doaj   +1 more source

Broad emission features in QSOs and active galactic nuclei. I - New calculations of Fe II line strengths

, 1983
H. Netzer, Beverley J. Wills
openalex   +1 more source

Anisotropic induced Compton scattering - Constraints on models of active galactic nuclei [PDF]

, 1993
P. Coppi, R. D. Blandford, M. J. Rees
openalex   +1 more source