Results 271 to 280 of about 1,091,526 (300)

Optical and radio studies of radio sources

Astronomy Letters, 2003
We present the classification of optical identifications and radio spectra of six radio sources from a complete (in flux density) sample in the declination range 10° to 12°30′ (J2000.0). The observations were carried out with the 6-m Special Astrophysical Observatory telescope (Russia) in the wavelength range 3600–10000 A, the 2.1-m GHAO telescope ...
V. L. Afanasiev, S. N. Dodonov, A. V. Moiseev, V. Chavushyan, R. Mujica, Y. Juarez, A. G. Gorshkov, V. K. Konnikova, M. G. Mingaliev   +8 more
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Models for Extragalactic Radio Sources

Symposium - International Astronomical Union, 1986
Doubt is cast on the reality of the following four assumptions commonly made in the treatment of extragalactic radio sources: (1) The central engine is a black hole; (2) Electrons can be accelerated in situ in the knots and heads of the jets, to large Lorentz factors γ ≥ 102, with an efficiency exceeding 30%; (3) The (non-thermal) radiation emitted by ...
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Jets in Extragalactic Radio Sources

Science, 1984
Observations now require that there be a continuous supply of energy to the giant extragalactic radio sources. These observations also suggest that this energy input may be in the form of streams or jets of gas emanating from the centers of galaxies and quasi-stellar objects. Current data indicate that the large-scale jet structures are not moving with
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Alignment of distant radio sources

Nature, 1984
A typical extragalactic radio source is a simple double or elongated structure with a well-defined orientation on the sky. In 1972, Willson1 investigated the relative orientation of 74 extragalactic 3C radio sources mapped at the Cambridge 1-mile telescope, and noted that extended extragalactic radio sources tend to be parallel if they are separated by
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Radio Sources in the Vicinity of Source M 31

Science, 1967
The region α (right ascension) equal to 23 h 50 m to 01 h 30 m , δ (declination) 39°20′ to 40°40′ has been observed at 195 and 430 megahertz with the 1000-foot (300 m) telescope of the Arecibo Ionospheric Observatory.
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The Earth as a Radio Source

1976
Satellite low frequency radio measurements have revealed that the Earth is a very intense and interesting radio source with characteristics similar to other astronomical radio sources such as Jupiter, Saturn and the Sun. In this paper we summarize the primary characteristics of radio emissions from the Earth’s magnetosphere, consider the origin of ...
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Compact steep-spectrum and peaked-spectrum radio sources

Astronomy and Astrophysics Review, 2021
C P O'Dea, D J Saikia
exaly  

Evolution of Radio Sources

Science, 1978
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Radio Sources

2004
Ron Ekers, Helen Sim
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Radio sources segmentation and classification with deep learning

Astronomy and Computing, 2023
B Lao, S Jaiswal, S -L Qin
exaly