Results 251 to 259 of about 242,882 (259)

Long-term radio variability of active galactic nuclei at 37 GHz

S. Kankkunen, M. Tornikoski, T. Hovatta, A. Lähteenmäki   +3 more
openalex   +1 more source

Cosmic evolution of radio-excess active galactic nuclei in quiescent and star-forming galaxies across 0 < z < 4

Yijun Wang, Tao Wang, Daizhong Liu, M. Sargent, F. Gao, D. M. Alexander, W. Rujopakarn, Luwenjia Zhou, E. Daddi, Ke Xu, Kotaro Kohno, Shuowen Jin   +11 more
openalex   +1 more source

Feedback mechanisms stopping the star formation in a pair of massive galaxies in the early Universe

Pérez-González P, D'Eugenio F, Pino BRD, Perna M, Uebler H, Maiolino R, Arribas S, Lamperti I, Bunker A, Carniani S, Charlot S, Willott C, Böker T, Parlanti E, Scholtz J, Venturi G, Barro G, Costantin L, Navarro IM, Dunlop J, Magee D, Cresci G.   +21 more
europepmc   +1 more source

The multiwavelength behaviour of BL Lacertae explained by a wiggling filamentary jet

Raiteri C.
europepmc   +1 more source

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Faint Radio Active Galactic Nuclei

Chinese Journal of Astronomy and Astrophysics, 2005
To separate the faint radio AGN population and a population of star-forming galaxies and then to determine the properties of each population it is necessary to couple deep radio and optical observations over a reasonably large area of sky. Here we present the preliminary results obtained cross-matching the photometric VIMOS survey (Visible MultiObject ...
L. Gregorini
openaire   +4 more sources

FAINT, EVOLVING RADIO ACTIVE GALACTIC NUCLEI IN SDSS LUMINOUS RED GALAXIES

, 2009
We detect and study the properties of faint radio active galactic nuclei (AGNs) in luminous red galaxies (LRGs). The LRG sample comprises 760,000 objects from a catalog of LRG photometric redshifts constructed from the Sloan Digital Sky Survey (SDSS ...
J. Hodge, G. Zeimann, R. Becker, R. Becker, R. White   +4 more
semanticscholar   +1 more source

Unified models for active galactic nuclei and quasars

, 1993
Because the critical central regions of Active Galactic Nuclei (AGN) and quasars are strongly nonspherical but spatially unresolved, orientation effects have been the source of much confusion. In fact, it now appears that much of the variety in AGN types
R. Antonucci
semanticscholar   +1 more source

Active galactic nuclei as seen by the Spitzer Space Telescope

, 2020
The Spitzer Space Telescope revolutionized studies of active galactic nuclei (AGNs). Its combined sensitivity and mapping speed at mid-infrared wavelengths revealed a substantial population of highly obscured AGNs.
M. Lacy, A. Sajina
semanticscholar   +1 more source

The kinetic luminosity of radio jets in active galactic nuclei

AIP Conference Proceedings, 2008
Based on the Konigl's inhomogeneous jet model, we estimate the jet parameters, such as bulk Lorentz factor Γ, viewing angle θ and electron number density ne from radio VLBI and X‐ray data for a sample of active galactic nuclei (AGNs). The kinetic luminosity of jets is then calculated using the derived jet parameters.
Minfeng Gu, Xinwu Cao, D. R. Jiang, Ye-Fei Yuan, Xiang-Dong Li, Dong Lai   +5 more
openaire   +2 more sources