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High-resolution observations of the galactic centre at 1420 Mc/s in the continuum and in the neutral hydrogen line

Published online by Cambridge University Press:  14 August 2015

N. F. Ryzhkov ,
T. M. Egorova ,
I. V. Gossachinsky  and
N. V. Bystrova
N. F. Ryzhkov
Affiliation:
Pulkovo Observatory
T. M. Egorova
Affiliation:
Pulkovo Observatory
I. V. Gossachinsky
Affiliation:
Pulkovo Observatory
N. V. Bystrova
Affiliation:
Pulkovo Observatory

Extract

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The large Pulkovo radio telescope has a beamwidth of 7 min of arc in R.A. at a frequency of 1420 Mc/s. The continuum emission from the source Sagittarius A was measured with a bandwidth of 5 Mc/s. The mean drift curve is shown in Figure 1. It can be separated into components according to Drake (1959) as indicated in the figure. The galactic ridge is also shown. The right ascension, the antenna temperature, the observed angular diameter, and the flux density of each component are given in Table 1. The errors given in the table can be somewhat higher in the case of components 2 and 3 because of the difficulties of separating them. The calibration of the antenna and receiver was made using the flux densities of the sources IAU 19N4A, 05N2A, 05S0A, and 18S1A according to Westerhout (1958) with the corrections given by Altenhoff et al. (1960). The atmospheric extinction at λ = 21 cm was taken from these works as well.

Type
Section 1: The Galaxy
Information
Symposium - International Astronomical Union , Volume 20: The Galaxy and the Magellanic Clouds , 1964 , pp. 191 - 195
Copyright
Copyright © Australian Academy of Science 1964 

References

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