A 232 MHz survey of the area centred on DA240

Details A 232 MHz survey of the area centred on DA240 A 232 MHz survey of the area centred on DA240

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988cha%26a..12...87q&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 12, Issue 2, p. 87-98.

Astronomy and Astrophysics

Astrophysics

Scientific paper

A radio survey of the area (10° × 10°) centred on the giant radio galaxy DA240 (α = 07h45m, δ = 50.00') has been carried out with the Miyun aperture synthesis telescope at 232 MHz.
The Miyun aperture synthesis telescope came into operation in October 1984. It consists of 28 paraboloids (all 9m in diameter) distributed on an EW baseline of 1.164 km, the resolution is 3'.8 × 3'.8 csc δ at 232 MHz.
It has been shown (Tsien, 1982) that the thermal electron densities within the extended lobes and the eastern hotspot are very low (much less than 2 × 10-5 cm-3). This suggests that DA240 may be located in a large-scale hole with very low mass density. Therefore, the investigation of the area centred on DA240 would be helpful to the study of the evolution of radio galaxies and to cosmology.
The observational data obtained in November, 1984 have been reduced recently. A package has been developed especially for data analysis and image processing, including elimination of interferences, corrections of zero-point offset and phase distortions caused by the ionosphere and clean algorithm etc. The ionospheric effects caused by large-scale gradients have been the main problem. A self-calibration technique of ``one-dimensional brightness distribution correlation'' has been devised successfully for the instantaneous correction of ionospheric refraction.
A good quality map of the whole area has been obtained, and more than one hundred sources with flux density greater than 0.22 Jy (the limiting flux density on the map) have been listed.
The 232 MHz structure of DA240 cleaned with a Gaussian beam is shown in Fig. 3 and the central part of the map is shown in Fig. 4.

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