Results 11 to 20 of about 25,311 (211)
X-ray properties of coronal emission in radio quiet active galactic nuclei [PDF]
Frontiers in Astronomy and Space SciencesActive galactic nuclei (AGN) are powerful sources of panchromatic radiation. All AGN emit in X-rays, contributing around 5%–10% of the AGN bolometric luminosity.
Claudio Ricci +2 more
exaly +2 more sources
The origin of radio emission from radio-quiet active galactic nuclei [PDF]
Nature Astronomy, 2019 The central nuclei of galaxies, where supermassive black holes (SMBHs) are thought to reside, can experience phases of activity when they become active galactic nuclei (AGNs). An AGN can eject winds and jets and produce radiation across the entire electromagnetic spectrum.
F. Panessa +5 more
semanticscholar +4 more sources
Cosmic Evolution of Nearby Radio Active Galactic Nuclei
Journal of Physics: Conference Series, 2019 The exact formation mechanism of massive galaxy in the universe still become an open question in modern astrophysics. Radio emission from active galactic nucleus (AGN) is known to be suppressing stellar growth in the most massive galaxies, thus becoming ...
I. Andika +5 more
semanticscholar +3 more sources
The role of environment in the observed Fundamental Plane of radio active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 The optical Fundamental Plane of black hole activity relates radio continuum luminosity of active galactic nuclei (AGNs) to [OⅠⅠⅠ] luminosity and black hole mass. We examine the environments of low-redshift (𝓏
S. Shabala
semanticscholar +4 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).
B. Boccardi +4 more
semanticscholar +5 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 kiloparsec-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 <
Arran C. Gross +4 more
semanticscholar +5 more sources
Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
Galaxies, 2016 The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time.
Anne Lähteenmäki +1 more
doaj +3 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 dichotomy of active galactic nuclei [PDF]
Publications of the Astronomical Society of Japan, 2022 Abstract The question of radio dichotomy in active galactic nuclei (AGNs) is still in debate, even though it has been discussed for more than 40 years. In order to solve this old riddle, we collect a sample of AGNs with optical B band and radio 6 cm wavelength data to analyze the radio loudness log R. Our results indicate a separation of
Xiao, Hubing +4 more
openaire +2 more sources
Search and Characterization of Remnant Radio Galaxies in the XMM-LSS Deep Field
The Astrophysical Journal, 2023 The remnant phase of a radio galaxy is characterized by the cessation of active galactic nuclei activity, resulting in the jets ceasing to feed plasma to the radio lobes.
Sushant Dutta +5 more
doaj +1 more source