Results 81 to 90 of about 217,086 (193)

Compact Radio Sources, Quasars and Active Galactic Nuclei [PDF]

, 1994
K. L. Kellermann
openalex   +1 more source

Narrow CIV lambda 1549A Absorption Lines in Moderate-Redshift Quasars [PDF]

arXiv, 2001
A large, high-quality spectral data base of well-selected, moderate-redshift radio-loud and radio-quiet quasars is used to characterize the incidence of narrow associated CIV lambda 1549 absorption, and how this may depend on some quasar properties, including radio-type. Preliminary results of this study are presented.
arxiv  

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

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

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

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

, 2000
Charles H. Nelson
openalex   +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

FRAMEx. V. Radio Spectral Shape at Central Subparsec Region of Active Galactic Nuclei

The Astrophysical Journal
We present results from the Very Long Baseline Array multifrequency (1.6, 4.4, 8.6, and 22 GHz), high-sensitivity (∼25 μ Jy beam ^−1 ), subparsec-scale (
Onic I. Shuvo, Megan C. Johnson, Nathan J. Secrest, Mario Gliozzi, Phillip J. Cigan, Travis C. Fischer, Alexander J. Van Der Horst   +6 more
doaj   +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