Results 1 to 10 of about 62,437 (252)
Radio observations of active galactic nuclei with mm-VLBI [PDF]
The Astronomy and Astrophysics Review, 2017 Over the past few decades, our knowledge of jets produced by active galactic nuclei (AGN) has greatly progressed thanks to the development of very-long-baseline interferometry (VLBI).
Boccardi, B. +3 more
core +6 more sources
On the radio dichotomy of active galactic nuclei [PDF]
, 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 +4 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).
J. F. Radcliffe +5 more
openalex +3 more sources
Unified Schemes for Radio-Loud Active Galactic Nuclei [PDF]
, 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.
Padovani, Paolo, Urry, C. Megan
core +2 more sources
Radio Loud and Radio Quiet Active Galactic Nuclei [PDF]
, 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
Antonucci R. +33 more
core +6 more sources
Identifying Radio-active Galactic Nuclei among Radio-emitting Galaxies [PDF]
Astrophysical Journal, 2021 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
openalex +3 more sources
X-ray Properties of Radio-Selected Dual Active Galactic Nuclei [PDF]
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 +4 more sources
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 ...
Stanislav S. Shabala +7 more
openalex +3 more sources
Changing-Look AGNs or Short-Lived Radio Sources? [PDF]
Frontiers in Astronomy and Space Sciences, 2017 The evolution of extragalactic radio sources has been a fundamental problem in the study of active galactic nuclei for many years. A standard evolutionary model has been created based on observations of a wide range of radio sources.
Aleksandra Wołowska +3 more
doaj +6 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 +2 more sources