scholarly journals Novel Interferometer for Studies of Discrete Radio Sources.

1962 ◽  
Vol 67 ◽  
pp. 575
Author(s):  
James N. Douglas ◽  
Clinton C. Brooks
Keyword(s):  
Radio Sources ◽  
Discrete Radio Sources

scholarly journals Observations of Galactic and Extragalactic Jets

1986 ◽  
Vol 89 ◽  
pp. 403-424
Author(s):  
R.A. Perley
Keyword(s):  
Radio Sources ◽  
Fourier Synthesis ◽  
Original Design ◽  
Quality Of Information ◽  
Very Large Array ◽  
Imaging Interferometer ◽  
Extragalactic Jets ◽  
Angular Extent ◽  
Discrete Radio Sources

Since nearly all discrete radio sources of astronomical interest are of insufficient angular extent for their detailed structural properties to be accessible to single-dish radio telescopes, radio interferometry must be employed to gain information on the morphologies of these objects. Recently constructed imaging interferometer arrays which employ the technique of Fourier synthesis, particularly MERLIN and the VLA (Very Large Array), and the more recent VLBI arrays, have given unprecedented imaging capabilities, with the result that our knowledge, and hence perceptions, of discrete radio sources have vastly changed over the last few years. An equally important parallel development has been image processing algorithms. These have vastly improved the quality of information produced by these arrays, so that an instrument such as the VLA can now produce images with speed and quality exceeding original design specifications by factors of 100 to 1000.

Discrete Radio Sources in the Spiral Galaxy NGC 6946

2000 ◽  
Vol 119 (4) ◽  
pp. 1711-1719 ◽  
Author(s):  
Scott D. Hyman ◽  
Christina K. Lacey ◽  
Kurt W. Weiler ◽  
Schuyler D. Van Dyk
Keyword(s):  
Spiral Galaxy ◽  
Radio Sources ◽  
Ngc 6946 ◽  
Discrete Radio Sources

Apparent Angular Sizes of Discrete Radio Sources: Observations at Sydney

Nature ◽  
1952 ◽  
Vol 170 (4338) ◽  
pp. 1063-1064 ◽  
Author(s):  
B. Y. MILLS
Keyword(s):  
Radio Sources ◽  
Discrete Radio Sources

The spectra of some discrete radio sources in 10?5000 MHz frequency range

1970 ◽  
Vol 8 (2) ◽  
pp. 275-322 ◽  
Author(s):  
S. Ya. Braude ◽  
A. V. Megn ◽  
B. P. Ryabov ◽  
I. N. Zhouck
Keyword(s):  
Radio Sources ◽  
Frequency Range ◽  
Discrete Radio Sources

scholarly journals Measurements Of The Flux Density Of Discrete Radio Sources At 6 Cm Wavelength

1966 ◽  
Vol 19 (4) ◽  
pp. 577 ◽  
Keyword(s):  
Flux Density ◽  
Radio Telescope ◽  
Power Law ◽  
Radio Sources ◽  
Frequency Range ◽  
Thermal Radio ◽  
Discrete Radio Sources ◽  
Selection Of ◽  
Lower Frequencies

The flux densities of 67 non-thermal radio sources have been measured at a frequency of 5000 Mc/s with the CSIRO 210 ft radio telescope at Parkes. The sources were chosen from the stronger objects in the 3C catalogue (Edge et al. 1959), the CTA and CTD catalogues (Harris and Roberts 1960; Kellermann and Read 1965), and the Parkes catalogue (Bolton, Gardner, and Mackey 1964; Price and Milne 1965; Day et al. 1966). In the selection of sources observed in this program, special emphasis was placed on objects whose spectra at lower frequencies showed significant departures from the usual power law with an index near -0�8. Most of the sources reported here have not been previously measured at wavelengths shorter than 10 cm and thus the present observations extend the frequency range of their spectra by nearly a factor of two.

scholarly journals 28. The angular diameter of discrete radio sources

1957 ◽  
Vol 4 ◽  
pp. 162-165
Author(s):  
H. P. Palmer
Keyword(s):  
Resolving Power ◽  
Angular Diameter ◽  
Radio Sources ◽  
Discrete Radio Sources ◽  
Angular Diameters

An interferometer of readily varied resolving power has been constructed at Jodrell Bank, and since 1953 it has been used to measure the angular diameters of all but the faintest of the discrete sources reported in the survey of Brown and Hazard [1].

scholarly journals Ghost Images in a Universe with Inhomogeneous Mass Distribution

1972 ◽  
Vol 44 ◽  
pp. 478-491 ◽  
Author(s):  
J. M. Barnothy ◽  
M. F. Barnothy
Keyword(s):  
Mass Distribution ◽  
Background Radiation ◽  
Positive Curvature ◽  
Radio Sources ◽  
Microwave Background ◽  
Microwave Background Radiation ◽  
Discrete Radio Sources ◽  
Ghost Images

An attempt is made to explain Morgan cD supergiant galaxies, the microwave background radiation and extended discrete radio sources as ghost images in a universe of strong positive curvature and inhomogeneous mass distribution.

scholarly journals The Texas Radio Astrometric Survey

1974 ◽  
Vol 61 ◽  
pp. 141-141
Author(s):  
James N. Douglas
Keyword(s):  
Radio Source ◽  
Radio Sources ◽  
Selection Effects ◽  
Sky Survey ◽  
Coordinate Measurements ◽  
Discrete Radio Sources

The 5-element Texas Interferometer is engaged in a 365 MHz survey of the sky with a primary goal of establishing positions of about 50000 discrete radio sources with an accuracy of about 1″ in each coordinate. Measurements are made relative to optical positions of identified sources, and the 2000 positions thus far obtained support our expectations of the accuracy of the survey. In a companion program, optical positions of objects near radio source positions are being measured to ±1/2″ accuracy on glass copies of the Palomar Sky Survey, yielding both improved overall calibration of the radio positions and identification of associated optical objects on the basis of position coincidence alone, without the selection effects usually introduced by auxiliary identification criteria.

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