Polarized Brightness Distribution over Cassiopeia A, the Crab Neubla, and Cygnus A at 1.55-cm Wavelength.

1967 ◽  
Vol 72 ◽  
pp. 815
Author(s):  
Cornell H. Mayer ◽  
James P. Hollinger
Keyword(s):  
Brightness Distribution ◽  
Cassiopeia A ◽  
Cygnus A

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.

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

Absolute measurements of the intensity of radio emission from Cassiopeia-A, Cygnus-A, and Taurus-A in the 3?15 cm range of wavelengths

1970 ◽  
Vol 13 (6) ◽  
pp. 649-654 ◽  
Author(s):  
D. A. Dmitrenko ◽  
N. M. Tseitlin ◽  
L. V. Vinogradova ◽  
Kh. F. Giterman
Keyword(s):  
Radio Emission ◽  
Cassiopeia A ◽  
Cygnus A ◽  
Absolute Measurements

scholarly journals Interferometric observation of Cygnus-А discrete radiosource scintillations at Irkutsk Incoherent Scatter radar

2016 ◽  
Vol 2 (1) ◽  
pp. 24-31
Author(s):  
Мария Глоба ◽  
Mariia Globa ◽  
Роман Васильев ◽  
Roman Vasilyev ◽  
Дмитрий Кушнарев ◽  
...  
Keyword(s):  
Angular Size ◽  
Brightness Distribution ◽  
Radiowave Propagation ◽  
Statistical Characteristics ◽  
Incoherent Scatter Radar ◽  
Incoherent Scatter ◽  
Cygnus A ◽  
Scatter Radar ◽  
Recording Channels ◽  
Interferometric Observation

We propose a new method for analysis of data from Irkutsk Incoherent Scatter Radar. The method allows us to accomplish interferometric observation of discrete cosmic radiosource characteristics. In this study, we analyzed ionospheric scintillations of the radio source Cygnus-A. Observations were made in 2013 during regular radar sessions within 5–15 days for different seasons, and the effective time of observation was 15–30 minutes per day. For interferometric analysis, the properties of correlation (coherence) coefficient of two independent recording channels were used. The statistical analysis of data from independent channels allows us to construct two-dimensional histograms of radiosource brightness distribution with period of 18 s and to determine parameters (the maximum position and the histogram width) representing position and angular size of radiosource for each histogram. It is shown that the change of statistical characteristics does not correlate with fluctuations in power (scintillations) of the signal caused by radiowave propagation through ionospheric irregularities.

scholarly journals 21. The low-frequency spectrum of Cygnus A and Cassiopeia A

1957 ◽  
Vol 4 ◽  
pp. 145-147
Author(s):  
R. J. Lamden ◽  
A. C. B. Lovell
Keyword(s):  
Lower Limit ◽  
Radio Telescope ◽  
Low Frequency ◽  
Radio Sources ◽  
Pencil Beam ◽  
Frequency Range ◽  
Present Communication ◽  
Cassiopeia A ◽  
Cygnus A ◽  
Radio Transmitters

The published measurements of the intensity of the radio sources cover a frequency range down to a lower limit of 22·6 Mc./s., at which measurements have been made on Cygnus and Cassiopeia by Hey and Hughes (1954)[1]. Information about the spectrum at still lower frequencies is difficult to obtain because of interference arising from ionospheric reflexion of distant radio transmitters. Some of this trouble can be alleviated by using a narrow pencil-beam radio telescope for reception and the present communication describes measurements made on frequencies of 16·5, 19·0, 22·6 and 30·0 Mc./s. using the 218 ft. transit radio telescope at Jodrell Bank.

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