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We present a complete sample of megaparsec-size double radio sources compiledfrom the Sydney University Molonglo Sky Survey (SUMSS). Almost completeredshift information has been obtained for the sample. The sample has thefollowing defining criteria: Galactic latitude |b| > 12.5 deg, declination <-50 deg and angular size > 5 arcmin. All the sources have projected linear sizelarger than 0.7 Mpc (assuming H_o = 71 km/s/Mpc). The sample is chosen from aregion of the sky covering 2100 square degrees. In this paper, we present843-MHz radio images of the extended radio morphologies made using the MolongloObservatory Synthesis Telescope (MOST), higher resolution radio observations ofany compact radio structures using the Australia Telescope Compact Array(ATCA), and low resolution optical spectra of the host galaxies from the 2.3-mAustralian National University (ANU) telescope at Siding Spring Observatory.The sample presented here is the first in the southern hemisphere andsignificantly enhances the database of known giant radio sources. The giantradio sources with linear size exceeding 0.7 Mpc have an abundance of (215Mpc)^(-3) at the sensitivity of the survey. In the low redshift universe, thesurvey may be suggesting the possibility that giant radio sources with relictlobes are more numerous than giant sources in which beams from the centrecurrently energize the lobes.

A Complete Sample of Megaparsec-sized Double Radio Sources from the Sydney University Molonglo Sky Survey