Frequency dependence and variation with time of the flux density ratio of the discrete sources Cassiopeia A and Cygnus A at decameter wavelengths

1966 ◽  
Vol 8 (2) ◽  
pp. 162-165
Author(s):  
A. Ya. Braude
Keyword(s):  
Frequency Dependence ◽  
Flux Density ◽  
Density Ratio ◽  
Cassiopeia A ◽  
Cygnus A

scholarly journals Secular Decreases in the 927 MHz Emission from the Supernova Remnants Cas A and Tau A

1979 ◽  
Vol 32 (2) ◽  
pp. 93 ◽  
Author(s):  
EN Vinyajkin ◽  
VA Razin
Keyword(s):  
Flux Density ◽  
Supernova Remnants ◽  
Radio Galaxies ◽  
Orion Nebula ◽  
Density Measurements ◽  
Cassiopeia A ◽  
The Past ◽  
Cygnus A ◽  
Cas A ◽  
Made In

This paper presents 927 MHz flux densities for the SNRs Cassiopeia A and TaurusA relative to those for the radio galaxies Cygnus A and Virgo A and for the Orion Nebula. The measurements were made in October-December 1977 with the 10 m radiotelescope at the Staraya Pustyn' (NIRFI) RadioastronomicaI Observatory. Comparison between these data and the absolute flux density measurements of Razin and Fedorov (1963) yields an annual decrease in flux density of 0�95%�0�04% for CasA and 0�18%�0�01% for TauA (14�2%�0�6% and 2�7%� 0�1% respectively over the past 15 years).

scholarly journals 24. The 400 Mc./s. flux from Cassiopeia A

1957 ◽  
Vol 4 ◽  
pp. 154-154
Author(s):  
Ch. L. Seeger
Keyword(s):  
Ambient Temperature ◽  
Flux Density ◽  
Boiling Point ◽  
Density Measurement ◽  
The Other ◽  
Noise Power ◽  
Pure Nitrogen ◽  
Cassiopeia A ◽  
Pyramidal Horn ◽  
Flux Density Measurement

The first trial of equipment designed for 400 Mc./s. absolute flux density measurement was completed just prior to this symposium. Using the midday sun, the gain of a 7·5 metre Würzburg (equipped with a TE°11 circular wave-guide feed) was found by comparison with an ‘optimum’ pyramidal horn of 20·2 square wave-lengths aperture. Cable losses and signal powers were measured against the available noise power from two co-axial resistors, one at ambient temperature and the other stabilized at the boiling-point of pure nitrogen.

scholarly journals The structure of the Cassiopeia A and Cygnus A radio sources measured at 127 Mc/s and 3000 Mc/s

1959 ◽  
Vol 9 ◽  
pp. 309-314
Author(s):  
R. C. Jennison
Keyword(s):  
Position Angle ◽  
Brightness Distribution ◽  
Radio Sources ◽  
Cassiopeia A ◽  
The Third ◽  
Cygnus A ◽  
Main Component ◽  
Main Region

The brightness distribution across the Cassiopeia A source in position angle 90 degrees consists of a primary region of emission 4.1 minutes of arc in width, with a much fainter extension offset from the main region of emission and having a brightness of only 10 per cent of that of the main component. Measurements were made up to the third maximum of the transform (2160 λ), and the position of the first zero was determined at 840 λ.

Secular Variation of the Flux Density of the Radio Source Cassiopeia A

Nature ◽  
1961 ◽  
Vol 190 (4777) ◽  
pp. 705-706 ◽  
Author(s):  
D. S. HEESCHEN ◽  
B. L. MEREDITH
Keyword(s):  
Radio Source ◽  
Flux Density ◽  
Secular Variation ◽  
Cassiopeia A

scholarly journals Power Spectrum of the Density of Cold Atomic Gas in the Galaxy toward Cassiopeia A and Cygnus A

2000 ◽  
Vol 543 (1) ◽  
pp. 227-234 ◽  
Author(s):  
A. A. Deshpande ◽  
K. S. Dwarakanath ◽  
W. M. Goss
Keyword(s):  
Power Spectrum ◽  
Cassiopeia A ◽  
Cygnus A ◽  
The Galaxy ◽  
Atomic Gas
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