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Information of small-diameter sources is extracted from the Sino-German 6cmpolarisation survey of the Galactic plane carried out with the Urumqi 25-mtelescope. We performed two-dimensional elliptical Gaussian fits to the 6cmmaps to obtain a list of sources with total-intensity and polarised fluxdensities. The source list contains 3832 sources with a fitted diameter smallerthan 16 arcmin and a peak flux density exceeding 30 mJy, so about 5 times therms noise, of the total-intensity data. The cumulative source count indicatescompleteness for flux densities exceeding about 60 mJy. We identify 125linearly polarised sources at 6cm with a peak polarisation flux density greaterthan 10 mJy, so about 3 times the rms noise, of the polarised-intensity data.Despite lacking compact steep spectrum sources, the 6cm catalogue lists about20 percent more sources than the Effelsberg 21cm source catalogue at the sameangular resolution and for the same area. Most of the faint 6cm sources musthave a flat spectrum and are either HII regions or extragalactic. When comparedwith the Green Bank 6cm (GB6) catalogue, we obtain higher flux densities for anumber of extended sources with complex structures. Polarised 6cm sourcesdensity are uniformly distributed in Galactic latitude. Their number densitydecreases towards the inner Galaxy. More than 80 percent of the polarisedsources are most likely extragalactic. With a few exceptions, the sources havea higher percentage polarisation at 6cm than at 21cm. Depolarisation seems tooccur mostly within the sources with a minor contribution from the Galacticforeground emission.

A Sino-German 6cm polarisation survey of the Galactic plane - VIII. Small-diameter sources