Results 131 to 140 of about 23,272 (235)

Deciphering Radio Emissions from Accretion Disk Winds in Radio-quiet Active Galactic Nuclei

The Astrophysical Journal
Unraveling the origins of radio emissions from radio-quiet active galactic nuclei (RQ AGNs) remains a pivotal challenge in astrophysics. One potential source of this radiation is the shock interaction between AGN disk winds and the interstellar medium ...
Tomoya Yamada, Nobuyuki Sakai, Yoshiyuki Inoue, Tomonari Michiyama   +3 more
doaj   +1 more source

Do All the Quasars and High-excitation Radio Galaxies (HERGs) in the 3CRR Catalog Contain a Magnetically Arrested Disk (MAD)?

The Astrophysical Journal
Based on the magnetization, an accretion disk with a large-scale magnetic field can be separated into either standard and normal evolution or magnetically arrested disk (MAD), which are difficult to identify from observations. It is still unclear whether
Shuang-Liang Li, Wenwen Zuo, Xinwu Cao
doaj   +1 more source

Total Flux Density Variations in Extragalactic Radio Sources. III. Doppler Boosting Factors, Lorentz Factors, and Viewing Angles for Active Galactic Nuclei [PDF]

, 1999
A. Lähteenmäki, E. Valtaoja
openalex   +1 more source

An X‐Ray Spectral Survey of Radio‐loud Active Galactic Nuclei withASCA [PDF]

, 1999
R. M. Sambruna, Michael Eracleous, R. F. Mushotzky   +2 more
openalex   +1 more source

Revisiting Radio Variability of the Blazar 3C 454.3

The Astrophysical Journal
We examine lengthy radio light curves of the flat spectrum radio galaxy 3C 454.3 for possible quasiperiodic oscillations (QPOs). The data used in this work were collected at five radio frequencies, 4.8, 8.0, 14.5, 22.0, and 37.0 GHz between 1979 and 2013
Ashutosh Tripathi, Alok C. Gupta, Krista Lynne Smith, Paul J. Wiita, Margo F. Aller, Alexandr E. Volvach, Anne Lähteenmäki, Hugh D. Aller, Merja Tornikoski, Larisa N. Volvach   +9 more
doaj   +1 more source

Radio Galaxies—The TeV Challenge

Galaxies, 2019
Over the past decade, our knowledge of the γ -ray sky has been revolutionized by ground- and space-based observatories by detecting photons up to several hundreds of tera-electron volt (TeV) energies.
Bindu Rani
doaj   +1 more source

Radio Sources in Low‐Luminosity Active Galactic Nuclei. II. Very Long Baseline Interferometry Detections of Compact Radio Cores and Jets in a Sample of LINERs [PDF]

, 2000
H. Falcke, Neil M. Nagar, J. S. Ulvestad
openalex   +1 more source

Black Hole Mass, Velocity Dispersion, and the Radio Source in Active Galactic Nuclei [PDF]

, 2000
Charles H. Nelson
openalex   +1 more source

The density of extremely red objects around high-z radio-loud active galactic nuclei [PDF]

, 2000
A. Cimatti, D. Villani, L. Pozzetti, S. di Serego Alighieri   +3 more
openalex   +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