Results 1 to 10 of about 39,964 (166)
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
Antonucci R. +33 more
core +6 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. 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
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.
Padovani, Paolo, Urry, C. Megan
core +2 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
Gamma Ray Bursts and Radio Loud Active Galactic Nuclei [PDF]
AIP Conference Proceedings, 2003 We believe that the radiation we receive from Gamma-Ray Bursts (GRBs) and radio loud Active Galacti Nuclei (AGNs) originates from the transformation of bulk relativistic motion into random energy. Mechanisms to produce, collimate and accelerates the jets
Ghisellini, G.
core +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
Revealing two radio active galactic nuclei extremely near PSR J0437$-$4715 [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Newton's gravitational constant $G$ may vary with time at an extremely low level. The time variability of $G$ will affect the orbital motion of a millisecond pulsar in a binary system and cause a tiny difference between the orbital period-dependent ...
An, Tao +11 more
core +3 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
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 +5 more sources