Results 11 to 20 of about 40,224 (203)
Recurrent radio activity in active galactic nuclei [PDF]
EPJ Web of Conferences, 2012 There has been a growing body of persuasive evidence to indicate that AGN activity, powered by mass accretion onto a supermassive black hole, can involve multiple episodes.
Jamrozy M.
doaj +3 more sources
On the radio dichotomy of active galactic nuclei [PDF]
The Astrophysical Journal, 2016 It is still a mystery why only a small fraction of active galactic nuclei (AGNs) contain relativistic jets. Strong magnetic field is a necessary ingredient for jet formation, however, the advection of the external field in a geometrically thin disk is ...
Cao, Xinwu
core +2 more sources
Active Galactic Nuclei, Radio Jets and Acceleration of UHECRs [PDF]
Nuclear Physics B - Proceedings Supplements, 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 +27 more
core +4 more sources
VLBI observations of nearby radio loud Active Galactic Nuclei
Journal of Physics: Conference Series, 2008 We present an update of the parsec scale properties of the Bologna Complete Sample consisting of 95 radio sources from the B2 Catalog of Radio Sources and the Third Cambridge Revised Catalog (3CR), with z < 0.1.
Baum S +9 more
core +3 more sources
The Contribution of Active Galactic Nuclei to the Microjansky Radio Population [PDF]
The Astrophysical Journal, 2009 A X-ray background synthesis model is used to calculate the contribution of Active Galactic Nuclei (AGNs) to the 1.4 GHz number counts between 100 nJy and 10 mJy.
Ballantyne +56 more
core +2 more sources
X-ray Properties of Radio-Selected Dual Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2019 Merger simulations predict that tidally induced gas inflows can trigger kpc-scale dual active galactic nuclei (dAGN) in heavily obscured environments. Previously with the Very Large Array, we have confirmed four dAGN with redshifts between $0.04 < z < 0 ...
Djorgovski, S . G. +4 more
core +5 more sources
Investigating the Star Formation Characteristics of Radio Active Galactic Nuclei
The Astrophysical JournalThe coevolution of supermassive black holes and their host galaxies represents a fundamental question in astrophysics. One approach to investigating this question involves comparing the star formation rates (SFRs) of active galactic nuclei (AGNs) with ...
Bojun Zhang +7 more
doaj +4 more sources
Radio Properties of Low Redshift Broad Line Active Galactic Nuclei [PDF]
The Astronomical Journal, 2008 The question as to whether the distribution of radio-loudness in active galactic nuclei (AGN) is actually bimodal has been discussed extensively in the literature.
Cirasuolo +25 more
core +2 more sources
Radio Near-infrared Imaging of Dual Active Galactic Nuclei Candidates
The Astrophysical JournalWe report the results of a pilot study that searched for dual active galactic nuclei (AGN) in local ( z 10 ^8 K) radio sources that indicate the presence of either a parsec-scale-separation dual AGN ( d _sep ∼ 90 and ∼56 pc, respectively) or a radio ...
Makoto A. Johnstone +15 more
doaj +3 more sources
The radio emission from active galactic nuclei [PDF]
Astronomy & Astrophysics, 2021 Context. For nearly seven decades, astronomers have been studying active galaxies, that is to say, galaxies with actively accreting central supermassive black holes: active galactic nuclei (AGN). A small fraction are characterized by luminous, powerful radio emission: This class is known as radio-loud AGN.
J. F. Radcliffe +5 more
openaire +5 more sources