A Determination of the 408-MHZ Log N-Log from the b3 Radio Sources Catalogue

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The differential log N-log S is determined for the radio sources in the Bologna third catalogue (B3), giving an accurate description of the counts in the region 0.1-0.4 Jy, poorly defined by existing counts. The counts are compared with earlier, less accurate determinations from the B2 catalogues, finding good agreement, except for one minor, formally significant discrepancy. The B2 and B3 data are then compared with the all-sky list by Robertson (1973) and with counts in the Molonglo catalogue (Robertson, 1977). The agreement is generally good, especially with the all-sky list. Some signifcant discrepancies with part of the Molonglo catalogue are discussed. The B3 counts are also found to be in satisfactory agreement with the high-flux end of the Cambridge 5C counts. The large number of sources listed in the B3 catalogue, and its uniform sensitivity and good dynamic range, allow a check on the angular distribution of radiosources; while the data are consistent with a fully isotropic distribution, some hints of faint anisotropy on scales of ~80 square degrees are found.

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