Calibration radio sources for radio astronomy - Precision flux-density measurements at 2295 MHz

1976 ◽  
Vol 81 ◽  
pp. 1078 ◽  
Author(s):  
M. J. Klein ◽  
C. T. Stelzried
Keyword(s):  
Flux Density ◽  
Radio Astronomy ◽  
Radio Sources ◽  
Density Measurements

7.8-GHz Flux Density Measurements of Variable Radio Sources

1972 ◽  
Vol 77 ◽  
pp. 819 ◽  
Author(s):  
William A. Dent ◽  
Gabriel Kojoian
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Density Measurements ◽  
Variable Radio

scholarly journals Surveys of Radio Sources at 5 GHz

1977 ◽  
Vol 74 ◽  
pp. 63-74
Author(s):  
I. I. K. Pauliny-Toth
Keyword(s):  
Flux Density ◽  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Max Planck ◽  
Radio Astronomy Observatory ◽  
Density Relation ◽  
Strong Source ◽  
Optical Identifications ◽  
5 Ghz

A number of surveys have been carried out at a frequency of 5 GHz at the National Radio Astronomy Observatory (NRAO) and at the Max-Planck-Institut für Radioastronomie (MPIfR), with the aim of determining the number-flux density relation for the sources detected and also of obtaining their radio spectra and optical identifications. The surveys fall into two categories: first, the strong source (S) surveys, which are intended in due course to cover the whole northern sky and to be complete above a flux density of about 0.6 Jy; second, surveys of limited areas of sky down to lower levels of the flux density.

scholarly journals 5000 MHz Flux Densities and Spectra for 325 Small-diameter Radio Sources at Low Galactic Latitudes

1975 ◽  
Vol 28 (5) ◽  
pp. 633 ◽  
Author(s):  
JL Caswell ◽  
RF Haynes ◽  
DH Clark
Keyword(s):  
Flux Density ◽  
Small Diameter ◽  
Radio Sources ◽  
Density Measurements

Flux density measurements at 5000 MHz are presented for 325 of the small-diameter sources detected in the Molonglo 408 MHz galactic survey. By investigating the spectra we show that probably between 10 % and 15 % of the sources are galactic and the remainder extragalactic.

15.5-GHz flux-density measurements of variable radio sources

1974 ◽  
Vol 79 ◽  
pp. 1232 ◽  
Author(s):  
W. A. Dent ◽  
J. E. Kapitzky ◽  
G. Kojoian
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Density Measurements ◽  
Variable Radio

Flux Density Measurements of Radio Sources at 408 MHz

1969 ◽  
Vol 1 (5) ◽  
pp. 234-235 ◽  
Author(s):  
D. V. Wyllie
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Density Measurements ◽  
Absolute Measurements

The flux densities of 220 radio sources have been accurately measured at 408 MHz in order to provide a useful set of calibration sources accessible to southern radio astronomers. The flux densities are based on a scale defined by absolute measurements. This scale appears to be 10% higher than the commonly accepted CKL scale and about 8% higher than the scale defined by Kellermann when averaged over common sources.

scholarly journals Spectra for 107 Radio Sources Selected at 408 MHz

1973 ◽  
Vol 26 (6) ◽  
pp. 867 ◽  
Author(s):  
HS Murdoch ◽  
DG Hoskins
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Optical Identification ◽  
Density Measurements ◽  
Identification Rate ◽  
Significant Difference ◽  
Index Distribution ◽  
Optical Identifications ◽  
The Relationship ◽  
Very High

Radio spectra are presented for 107 sources which have previously been examined for optical identifications based on 408 MHz positions obtained with the Molonglo cross. Flux density measurements are given at five frequencies from 318 to 2695 MHz. The relationship between spectrum and optical identification is discussed. For sources with peaked, flat, or complex spectra the identification rate with QSO candidates is very high. For the remaining sources, no significant difference between the spectral index distribution of QSOs and galaxies is found.

Sign in / Sign up

Export Citation Format

Share Document