1999A&A...350..368P

We present a new 408MHz survey (B3.2) carried out with the ``Croce del Nord'' radiotelescope in Bologna. The survey coordinates limits are -2° 00' to +2° 15' in Dec. and 21h to 24h, 00h to 17h in R.A., equivalent to 0.388sr. The B3.2 is complete to 0.15Jy but many sources down to 0.1Jy are included. Our aim was to select a new and complete sample of Ultra Steep Spectrum (USS) radio sources, as they proved to be good candidates to find high-z radiogalaxies and their surrounding protoclusters. The observations and the reduction procedure are described and the observational errors are discussed. A cross-identification with the NVSS survey was performed to obtain the spectral index α₄₀₈¹⁴⁰⁰ and radio size of the sources. We found no evidence of a change of the spectral index distribution as radio flux decreases. The B3.2 USS sample contains 185 sources down to 0.1Jy and it is about one order of magnitude deeper in flux with respect to the 4C USS sample. For 146 B3.2 USS sources no optical counterpart was found on the POSS-I sky survey. A cross-correlation with the FIRST survey gave maps for a subset of 50 USS sources, and their optical ID search was also made on the POSS-II, resulting in 39 empty fields.