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30. Radio and optical intensity distributions in the Centaurus source (NGC5128)

Published online by Cambridge University Press:  14 August 2015

G. De Vaucouleurs  and
K. V. Sheridan
G. De Vaucouleurs
Affiliation:
Yale-Columbia Southern Station, Mount Stromlo, Canberra, Australia
K. V. Sheridan
Affiliation:
Yale-Columbia Southern Station, Mount Stromlo, Canberra, Australia Radiophysics Laboratory, Sydney, Australia

Extract

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(1) A preliminary determination of the apparent intensity distribution in the Centaurus source has been made with the 1500-ft. Mills' Cross at 3·5 metres wave-length. At the declination of the source the beam is nearly circular and has a half-power width of 0°·8. Fig. 1 shows contours of apparent equal intensity above a smooth interpolated reference level. The inner ‘point’ source[1] which is not resolved by the present equipment appears to be embedded in an extended source strongly elongated in position angle 12°. The secondary, isolated maxima and minima of intensity on the major axis of the extended source at distances greater than 1° from the central maximum are probably unreal and may represent side lobes in the diffraction image of the point source.

Type
Part II: Point Sources: Individual Study and Physical Theory
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 169 - 173
Copyright
Copyright © Cambridge University Press 1957 

References

1. Mills, B. Y. Aust. J. Phys. 6, 452, 1953.CrossRefGoogle Scholar
2. Evans, D. S. M.N.R.A.S. 109, 94, 1949.Google Scholar
3. Vaucouleurs, , de, G., Occasional Notes R.A.S. no. 18, 130, 1955.Google Scholar