2 The survey: First section

 

The observations have been made with the two channel HEMT 1.3-1.7 GHz receiver installed in the primary-focus of the Effelsberg 100-m telescope. The method of observation is to scan each field along Galactic latitude and longitude. Both coverages are combined as described in Paper I. The half-power-beam-width at 1.4 GHz is $9\hbox{$.\mkern-4mu^\prime$}35 \pm 0\hbox{$.\mkern-4mu^\prime$}04$. The conversion factor from the flux density per beam area to the main beam brightness temperature T_B is $2.12\pm 0.02$ K/Jy. Details of the data reduction are given in Paper I, where we also describe the method to reduce the instrumental polarization to a level of about 1%. The total intensity maps have been calibrated to an absolute scale using the Stockert 1.4 GHz survey and the polarization data by Dwingeloo 1.4 GHz data. Unfortunately, the Dwingeloo survey is incomplete. For some areas the data are severely undersampled or a have a low S/N-ratio.