scholarly journals Gain Measurements of Large Aerials Used in Interferometer and Cross?Type Radio Telescopes

1958 ◽  
Vol 11 (1) ◽  
pp. 70 ◽  
Author(s):  
AG Little
Keyword(s):  
Radio Telescope ◽  
Radio Sources ◽  
Radio Telescopes ◽  
Discrete Radio Sources ◽  
Cross Type

A method has been developed for measuring the gain of large interferometer and cross-type radio telescope aerials. Use is made of the strong discrete radio sources, whose intensity need not be known, to allow comparison of the gains of the aerials with that of a standard.

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 A Catalogue of Radio Sources Between Declinations ?50° and ?80°

1961 ◽  
Vol 14 (4) ◽  
pp. 497 ◽  
Author(s):  
BY Mills ◽  
OB Slee ◽  
ER Hill
Keyword(s):  
Statistical Analysis ◽  
Radio Telescope ◽  
Small Area ◽  
Radio Sources ◽  
Low Weight ◽  
Cross Type

A catalogue has been prepared of the radio sources observed between declinations -50� and -80�, using the Sydney cross-type radio telescope at a wavelength of 3�5 m; a total of 219 sources is listed. This supplements the earlier catalogues for the declination ranges +10� to -20� and -20� to -50�. In addition to the positions and intensities of the sources, angular sizes of 42 of the strongest sources are given. As before, identifications with bright optical objects have been sought, and a number of possible identifications with emission nebulae and bright galaxies are listed. Because of the small area of sky covered by the present catalogue, the numbers of sources are small (compared with those in our earlier catalogues) so that the statistical analysis of their distribution has comparatively low weight.

scholarly journals A Catalogue of Radio Sources Between Declinations ?20° and ?50°

1960 ◽  
Vol 13 (4) ◽  
pp. 676 ◽  
Author(s):  
BY Mills ◽  
OB Slee ◽  
ER Hill
Keyword(s):  
Radio Emission ◽  
Radio Telescope ◽  
Apparent Size ◽  
Statistical Analyses ◽  
Radio Sources ◽  
Cross Type

A catalogue has been prepared of the radio sources observed between declinations _200 and _500 , using the Sydney cross-type radio telescope at a wavelength of 3�5 m ; a total of 892 sources is listed. This supplements an earlier catalogue in the declination zone + 10� to _20�. In addition to the positions and intensities of the sources, angular sizes of 50 of the strongest are given: several are found to have a size less than 15" arc. As before, identifications with bright optical objects have been sought, and a number of galaxies of apparently abnormal radio emission listed. Statistical analyses of the distribution of the radio sources give results very similar to those obtained using the earlier catalogue. \Vithin the uncertainty in the data, the distribution appears uniform in depth and there is a siguificantly greater number of sources of large apparent size than expected from chance blending effects.

scholarly journals A Catalogue of Radio Sources Between Declinations +10° and ?20°

1958 ◽  
Vol 11 (3) ◽  
pp. 360 ◽  
Author(s):  
BY Mills ◽  
OB Slee ◽  
ER Hill
Keyword(s):  
Radio Telescope ◽  
Source Distribution ◽  
Radio Sources ◽  
Cross Type

A catalogue has been prepared of the radio sources observed between declinations +10� and ?20�, using the Sydney cross-type radio telescope at a wavelength of 3�5 m: a total of 1159 sources is listed in the area of 3�24 steradians. This supersedes an earlier catalogue of Mills and Slee in portion of the area, but the differences between the two are small. A number of new identifications with galaxies are suggested, and an analysis made of the statistics of the source distribution. It is concluded that cosmological effects displayed by the distribution, if present, are small. Possibilities are discussed of separating from this distribution the effects of the instrument, the finite angular sizes, and/or the physical clustering of the sources.

scholarly journals A survey of radio sources at 3.5-m wavelength

1959 ◽  
Vol 9 ◽  
pp. 498-506
Author(s):  
B. Y. Mills
Keyword(s):  
Radio Telescope ◽  
Radio Sources ◽  
Pencil Beam ◽  
Radio Frequency Radiation ◽  
Cassiopeia A ◽  
Highly Sensitive ◽  
Accurate Position ◽  
Cross Type ◽  
Frequency Radiation ◽  
Beam Instrument

Since their discovery in 1946, the discrete sources of radio-frequency radiation have provided some of the most difficult problems in radio astronomy. For their effective study, one requires a very highly sensitive radio telescope sufficiently precise for accurate position determination and with sufficient resolution to observe separately the detectable radio sources. These requirements led to the development of the Sydney 3.5-m Cross-type radio telescope, which is a pencil-beam instrument with a beamwidth of about 50 minutes of arc and a sensitivity such that under ideal conditions a source of intensity about 1/10,000 that of the strongest known source, Cassiopeia A, is just detectable.

scholarly journals Supernova Remnants as Radio Sources

1968 ◽  
Vol 21 (5) ◽  
pp. 739 ◽  
Author(s):  
MJL Kesteven
Keyword(s):  
Spectral Index ◽  
Radio Telescope ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Radio Sources ◽  
Evolutionary Path ◽  
Contour Maps ◽  
Galactic Sources ◽  
Cross Type

The results of a survey with the 1 mile Molonglo cross-type radio telescope of nonthermal galactic sources are discussed in terms of supernova remnant theories. The contour maps obtained indicate that most sources are consistent with a portion of a shell of emission. The results suggest that a remnant's spectral index is independent of its age. A supernova remnant evolutionary path is also derived, and compared with the path predicted by the various theories.

scholarly journals On increase of the sensitivity and directivity of radio interferometers

1959 ◽  
Vol 9 ◽  
pp. 496-497
Author(s):  
V. A. Sanamian ◽  
H. M. Tovmasian
Keyword(s):  
High Sensitivity ◽  
Resolving Power ◽  
Radio Sources ◽  
Radio Telescopes ◽  
Discrete Radio Sources

To discover the possibly large number of weak discrete radio sources and to determine their positions accurately is a very important and, at the same time, a difficult task. Radio telescopes with a large resolving power and a high-sensitivity receiver are necessary for this purpose.

Positions of Radio Sources Measured with the One-Mile Radio Telescope

Nature ◽  
1966 ◽  
Vol 210 (5031) ◽  
pp. 22-23 ◽  
Author(s):  
E. A. PARKER ◽  
B. ELSMORE ◽  
J. R. SHAKESHAFT
Keyword(s):  
Radio Telescope ◽  
Radio Sources ◽  
The One
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