Results 21 to 30 of about 25,311 (211)
Radio-loud and Radio-quiet Active Galactic Nuclei [PDF]
The Astronomical Journal, 1999 We generated a sample of 409 AGNs for which both the radio luminosity at 5 GHz and the line luminosity in [OIII] 5007 have been measured. The radio luminosity spans a range of ten orders of magnitude, and the [OIII] line luminosity spans a range of eight orders of magnitude --- both considerably larger than the ranges in previous studies.
Xu, Chun, Livio, Mario, Baum, Stefi A.
openaire +2 more sources
The Astrophysical Journal, 2023 The sampling strategy of the Transiting Exoplanet Survey Satellite (TESS) makes TESS light curves extremely valuable for investigating the high cadence optical variability of active galactic nuclei (AGN).
Krista Lynne Smith, Lia F. Sartori
doaj +1 more source
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 +13 more
semanticscholar +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
Low-luminosity radio-loud active galactic nuclei [PDF]
Proceedings of 8th European VLBI Network Symposium — PoS(8thEVN), 2007 I review observational properties of low power radio loud AGN. High resolution VLBI observations allow the estimate of the jet velocity and orientation with respect to the line of sight and the determination of the Doppler factor. These data reveal rich structures, including two-sided jets and secondary components. New results on 1144+35, a giant radio
Giovannini, Gabriele +1 more
openaire +3 more sources
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 +3 more
doaj +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
The fundamental plane of black hole activity for low-luminosity radio active galactic nuclei across 0 [PDF]
Astronomy & AstrophysicsThe fundamental plane of black hole activity describes the correlation between radio luminosity ($L_ R $), X-ray luminosity ($L_ X $), and black hole mass ($M_ BH $). It reflects a connection between the accretion disc and the jet.
Yijun Wang +6 more
semanticscholar +1 more source
Delayed triggering of radio Active Galactic Nuclei in gas-rich minor mergers in the local Universe [PDF]
, 2016 We examine the processes triggering star formation and active galactic nucleus (AGN) activity in a sample of 25 low-redshift (z 107 K) brightness temperature required for an mJIVE-20 detection allows us to unambiguously identify the radio AGN in our ...
S. Shabala +7 more
semanticscholar +1 more source
Ultrafast outflows in radio-loud active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 Recent X-ray observations show absorbing winds with velocities up to mildly-relativistic values of the order of ~0.1c in a limited sample of 6 broad-line radio galaxies. They are observed as blue-shifted Fe XXV-XXVI K-shell absorption lines, similarly to the ultra-fast outflows (UFOs) reported in Seyferts and quasars.
Tombesi F. +7 more
openaire +4 more sources