Results 1 to 10 of about 25,311 (211)
The radio emission from active galactic nuclei [PDF]
Astronomy and 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).
Thomas Muxlow +2 more
exaly +8 more sources
Investigating the Star Formation Characteristics of Radio Active Galactic Nuclei [PDF]
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 +5 more sources
Unified Schemes for Radio-Loud Active Galactic Nuclei [PDF]
Publications of the Astronomical Society of the Pacific, 1995 The appearance of active galactic nuclei (AGN) depends so strongly on orientation that our current classification schemes are dominated by random pointing directions instead of more interesting physical properties.
C Megan Urry, Paolo Padovani
exaly +5 more sources
Compact radio cores in radio-quiet active galactic nuclei [PDF]
Astronomy and Astrophysics, 2016 Context. The mechanism of radio emission in radio-quiet (RQ) active galactic nuclei (AGNs) is still debated and might arise from the central AGN, from star formation activity in the host, or from either of these sources. A direct detection of compact and
Isabella Prandoni +2 more
exaly +7 more sources
Identifying Radio-active Galactic Nuclei among Radio-emitting Galaxies [PDF]
The Astrophysical Journal, 2020 Basing our analysis on ROGUE I, a catalog of over 32,000 radio sources associated with optical galaxies, we provide two diagnostics to select the galaxies where the radio emission is dominated by an active galactic nucleus (AGN), referred to in the paper
D. Kozieł-Wierzbowska +6 more
semanticscholar +6 more sources
ENERGETICS AND LIFETIMES OF LOCAL RADIO ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 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 +4 more sources
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. A strong magnetic field is a necessary ingredient for jet formation, however, the advection of the external field in a geometrically thin disk is ...
Xinwu Cao
semanticscholar +4 more sources
15-GHz radio emission from nearby low-luminosity active galactic nuclei [PDF]
Astronomy and 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.
Deanne Coppejans +2 more
exaly +2 more sources
NGC 5252: a pair of radio-emitting active galactic nuclei? [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2016 The X-ray source CXO J133815.6+043255 has counterparts in the UV, optical, and radio bands. Based on the multiband investigations, it has been recently proposed by Kim et al. as a rarely seen off-nucleus ultraluminous X-ray (ULX) source with a black hole
Xiaolong Yang +9 more
semanticscholar +6 more sources