Results 21 to 30 of about 1,004,774 (284)
Duty cycle of the radio galaxy B2 0258+35 [PDF]
Astronomy & Astrophysics, 2018 Context. Radio loud active galactic nuclei (AGN) are episodic in nature, cycling through periods of activity and quiescence. The study of this duty cycle has recently gained new relevance because of the importance of AGN feedback for galaxy evolution ...
M. Brienza +16 more
semanticscholar +1 more source
Powerful Yet Lonely: Is 3C 297 a High-redshift Fossil Group?
The Astrophysical Journal Supplement Series, 2022 The environment of the high-redshift ( z = 1.408), powerful radio-loud galaxy 3C 297 has several distinctive features of a galaxy cluster. Among them, a characteristic halo of hot gas revealed by Chandra X-ray observations.
Valentina Missaglia +10 more
doaj +1 more source
Particle content, radio-galaxy morphology and jet power : all radio-loud AGN are not equal [PDF]
, 2018 Ongoing and future radio surveys aim to trace the evolution of black hole growth and feedback from active galactic nuclei (AGN) throughout cosmic time; however, there remain major uncertainties in translating radio luminosity functions into a reliable ...
J. Croston, J. Ineson, M. Hardcastle
semanticscholar +1 more source
RADIO DETECTION OF RADIO-QUIET GALAXIES [PDF]
The Astronomical Journal, 2008 We investigate the radio emission of ~185,000 quiescent (optically unclassifiable) galaxies selected from the Sloan Digital Sky Survey (SDSS). By median-stacking FIRST cutouts centered on the optically-selected sources, we are able to reach flux densities down to the 10s of microJy.
Hodge, J. A. +3 more
openaire +2 more sources
A single fast radio burst localized to a massive galaxy at cosmological distance [PDF]
Science, 2019 Pinpointing a single fast radio burst Fast radio bursts (FRBs) are flashes of radio emission from distant astronomical sources. Two FRBs are known to have repeated, but most last just a few milliseconds and are never seen again.
K. Bannister +57 more
semanticscholar +1 more source
Radio galaxy zoo EMU: towards a semantic radio galaxy morphology taxonomy
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT We present a novel natural language processing (NLP) approach to deriving plain English descriptors for science cases otherwise restricted by obfuscating technical terminology. We address the limitations of common radio galaxy morphology classifications by applying this approach.
Micah Bowles +22 more
openaire +5 more sources
Diffuse Radio Emission from Galaxy Clusters [PDF]
Space Science Reviews, 2019 In a growing number of galaxy clusters diffuse extended radio sources have been found. These sources are not directly associated with individual cluster galaxies.
R. V. Weeren +8 more
semanticscholar +1 more source
Radio Galaxy Zoo: giant radio galaxy classification using multidomain deep learning [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT In this work we explore the potential of multidomain multibranch convolutional neural networks (CNNs) for identifying comparatively rare giant radio galaxies from large volumes of survey data, such as those expected for new generation radio telescopes like the SKA and its precursors.
H Tang +3 more
openaire +2 more sources
LOFAR discovery of an ultra-steep radio halo and giant head–tail radio galaxy in Abell 1132 [PDF]
, 2017 Low-Frequency Array (LOFAR) observations at 144 MHz have revealed large-scale radio sources in the unrelaxed galaxy cluster Abell 1132. The cluster hosts diffuse radio emission on scales of similar to 650 kpc near the cluster centre and a head-tail (HT ...
A. Wilber +20 more
semanticscholar +1 more source
Radio galaxies: unification and dust properties [PDF]
New Astronomy Reviews, 2003 The 2002 status of unification models for extragalactic radio sources is examined, with particular emphasis on the dust properties of these objects.
Barthel, P, van Bemmel, I
openaire +3 more sources