A new Bologna sky survey at 408 MHz.

Observational data at 408 MHz on 13,354 radio sources in an 0.78-sr area between 37 deg 15 arcmin and 47 deg 37 arcmin declination, obtained with the enlarged Northern Cross transit radiotelescope during February-May 1977, are presented in tables and graphs as the first section of a third Bologna sky survey. Telescope parameters include NS length 635 m, EW length 572 m, angular resolution 2.6 arcmin EW and 4.8 arcmin x sec theta NS (where theta is the zenith angle), noise temperature 400 K, single-scan rms noise 10 mJy, bandpass 2.7 MHz, collecting area 27,000 sq m, and single-scan synthesis width 0.5 deg. The data-reduction procedures and the error limits are discussed in detail.