Are There Radio Voids

Details Are There Radio Voids Are There Radio Voids

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246p...7b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 246, NO. 1/SEP1, P. 7P, 1990

Astronomy and Astrophysics

Astronomy

1

Scientific paper

A large-scale ( ~1-Gpc) void in the distribution of extragalactic radio sources in the direction of the giant radio galaxy DA 240 has been claimed by Artyukh & Ogannisyan from counts of radio interplanetary scintillators using Pushchino data. I have re-examined this conclusion using total- intensity source counts for several random fields from the Texas Radio- Source Catalogue, which reaches to about the same depth. From these counts, the field of DA 240 is not the least populous of those studied, and none of the fields shows significant deviation from the mean population. For the fields that could be examined using the 6C-II survey (to a similar depth), the populations tally with those obtained from the Texas Catalogue. It is shown that the earlier claim of a void in the direction of DA240 can be largely attributed to an incorrect statistical procedure. The relative populations of scintillators and Texas sources indicate that at these flux- density levels > 40 per cent of sources must scintillate at 102 MHz.

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