Results 21 to 30 of about 62,437 (252)

A New Sample of Gamma-Ray Emitting Jetted Active Galactic Nuclei [PDF]

Universe, 2022
We considered the fourth catalog of gamma-ray point sources produced by the Fermi Large Area Telescope (LAT) and selected only jetted active galactic nuclei (AGN) or sources with no specific classification, but with a low-frequency counterpart. Our final
L. Foschini, M. Lister, H. Andernach, S. Ciroi, P. Marziani, S. Antón, M. Berton, E. Dalla Bontà, E. Järvelä, M. Marchã, P. Romano, M. Tornikoski, S. Vercellone, A. Vietri   +13 more
semanticscholar   +1 more source

Active Galactic Nuclei as Potential Sources of Ultra-High Energy Cosmic Rays [PDF]

Universe, 2022
Active Galactic Nuclei (AGNs) and their relativistic jets belong to the most promising class of ultra-high-energy cosmic ray (UHECR) accelerators. This compact review summarises basic experimental findings by recent instruments, and discusses possible ...
F. Rieger
semanticscholar   +1 more source

FRAMEx. IV. Mechanical Feedback from the Active Galactic Nucleus in NGC 3079

The Astrophysical Journal, 2023
Using the Very Long Baseline Array, we observed the active galactic nucleus (AGN) in NGC 3079 over a span of six months to test for variability in the two main parsec-scale radio components, A and B , which lie on either side of the AGN.
Luis C. Fernandez, Nathan J. Secrest, Megan C. Johnson, Travis C. Fischer   +3 more
doaj   +1 more source

The X-ray emission in young radio active galactic nuclei

Monthly notices of the Royal Astronomical Society, 2020
In this work, we investigated the X-ray emission for a sample of young radio active galactic nuclei (AGNs) by combining data from Chandra/XMM–Newton with data for other wavebands.
M. Liao, M. Gu, Minhua Zhou, Liang Chen
semanticscholar   +1 more source

ENERGETICS AND LIFETIMES OF LOCAL RADIO ACTIVE GALACTIC NUCLEI [PDF]

, 2015
We present a model describing the evolution of Fanaroff–Riley type I and II radio active galactic nuclei (AGNs) and the transition between these classes. We quantify galactic environments using a semianalytic galaxy formation model and apply our model to
R. Turner, S. Shabala
semanticscholar   +1 more source

Determining the radio active galactic nuclei contribution to the radio–far-infrared correlation using the black hole Fundamental Plane relation [PDF]

, 2016
We investigate the 1.4 GHz radio properties of 92 nearby ...
O. I. Wong, M. Koss, K. Schawinski, A. Kapińska, I. Lamperti, K. Oh, C. Ricci, S. Berney, B. Trakhtenbrot   +8 more
semanticscholar   +1 more source

15-GHz radio emission from nearby low-luminosity active galactic nuclei [PDF]

Astronomy & Astrophysics, 2018
We present a sub-arcsec resolution radio imaging survey of a sample of 76 low-luminosity active galactic nuclei (LLAGN) that were previously not detected with the Very Large Array at 15 GHz.
P. Saikia, Elmar Kording, D. Coppejans, H. Falcke, David R. Williams, R. D. Baldi, I. McHardy, R. Beswick   +7 more
semanticscholar   +1 more source

ARE RADIO ACTIVE GALACTIC NUCLEI POWERED BY ACCRETION OR BLACK HOLE SPIN? [PDF]

, 2010
We compare accretion and black hole spin as potential energy sources for outbursts from active galactic nuclei (AGNs) in brightest cluster galaxies (BCGs).
B. McNamara, B. McNamara, B. McNamara, M. Rohanizadegan, P. Nulsen   +4 more
semanticscholar   +1 more source

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3

Astrophysical Journal Supplement Series, 2022
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 yr of E > 50 MeV gamma-ray ...
M. Ajello, L. Baldini, J. Ballet, D. Bastieri, J. Becerra González, R. Bellazzini, A. Berretta, E. Bissaldi, R. Bonino, A. Brill, P. Bruel, S. Buson, R. Caputo, P. Caraveo, C. C. Cheung, G. Chiaro, N. Cibrario, S. Ciprini, M. Crnogorčević, S. Cutini, F. D’Ammando, S. De Gaetano, N. Di Lalla, L. Di Venere, A. Domínguez, V. Ramazani, E. Ferrara, A. Fiori, Y. Fukazawa, S. Funk, P. Fusco, V. Gammaldi, F. Gargano, S. Garrappa, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. Grenier, S. Guiriec, D. Horan, X. Hou, T. Kayanoki, M. Kuss, S. Larsson, L. Latronico, T. Lewis, J. Li, I. Liodakis, F. Longo, F. Loparco, B. Lott, M. Lovellette, P. Lubrano, G. Madejski, S. Maldera, A. Manfreda, G. Martí-Devesa, M. Mazziotta, I. Mereu, P. Michelson, N. Mirabal, W. Mitthumsiri, T. Mizuno, M. Monzani, A. Morselli, I. Moskalenko, M. Negro, R. Ojha, M. Orienti, E. Orlando, J. Ormes, Z. Pei, H. Peña-Herazo, M. Persic, M. Pesce-Rollins, V. Petrosian, R. Pillera, H. Poon, T. Porter, G. Principe, S. Rainò, R. Rando, Babita Rani, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, L. Scotton, D. Serini, C. Sgro’, E. Siskind, G. Spandre, P. Spinelli, D. Suson, H. Tajima, D. Torres, J. Valverde, H. Yassin, G. Zaharijas   +100 more
semanticscholar   +1 more source

Active Galactic Nuclei, Radio Jets and Acceleration of UHECRs [PDF]

, 2008
We present the general properties of the Active Galactic Nuclei (AGNs) and discuss the origin and structure of jets that are associated to a fraction of these objects.
Allen, Biermann, Biermann, Blandford, Cesarsky, Fanaroff, Giannios, Giovannini, Giovannini, Heinz, Hillas, Kang, Kovalev, Ledlow, Lyutikov, Massaglia, Massaglia, Mauch, Milgrom, Nagano, Prieto, Protheroe, Rachen, Rossi, S. Massaglia, Sikora, Urry, Vietri   +27 more
core   +2 more sources