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- W977355259 abstract "An ob3ervation of radio source W49 was made in the summer of 1966 to investigate the intensity distribution and the flux demity of the radio source at 9.4 GHz making use of a 10 meter diameter palaboloidal antenna and a maser preamplifier at the Research Institute of Atmospherics. The 10 meter dish has an aperture efficiency of approximately 50 96 and about 14 min.-of-arc half-power beam width at the frequency used. The receiver is of a switching type and its reference signal is taken from a matched load cooled by liquid nitrogen. The equivalen t noise temperature and the G • B product of the maser are 40°K and 100 MHz respectively. A more detailed description of this maser hqs been reported by Tanaka et al. (1965) . The preamplifier is followed a T.W.T. amplifier, and its equivalent noise temperature is about 1200°K in optimum operation. With this configulation of the equipment, the equivalent noise temperature of the whole system including the transmission losses of waveguides and a circulator is about 180°K. Observations are usually carried out through diurnal drift scans of radio sources, and in the course of observation, frequent calibrations are accomplished by means of an argon discharge tube whose noise is injected into the antenna a.rm of the transmission lines through a 20 dB directional coupler and a calibrated precision attenuator. It is well known that W49 consists of thermal and non-thermal components, and their declination differs by only about 40 sec.-of-arc (Pauliny-Toth, Wade, H eeschen 1966) a nd considering our antenna's rather beam width, we can still obtain meaningfull data by a scan in one declination. Drawn in Fig. I is the drift curve of W49 and is the average of ten scans. The drift curve is resolved into two gaussian components a nd each corrected for time constant by the formula (Pariiskii 1962)" @default.
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- W977355259 date "1968-03-20" @default.
- W977355259 modified "2023-09-28" @default.
- W977355259 title "OBSERVATION OF RADIO SOURCE W49 AT 9.4 GHz" @default.
- W977355259 hasPublicationYear "1968" @default.
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