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We present a catalogue of MgII absorption systems obtained from highresolution UVES/VLT data of 77 QSOs in the redshift range 0.6 < z < 2.0, anddown to an equivalent width W_0 > 0.1 \AA. The statistical properties of oursample are found to be in agreement with those from previous work in theliterature. However, we point out that the previously observed increase withredshift of dN/dz for weak absorbers, pertains exclusively to very weakabsorbers with W_0 < 0.1 \AA. Instead, dN/dz for absorbers with W_0 in therange 0.1-0.3 \AA actually decreases with redshift, similarly to the case ofstrong absorbers. We then use this catalogue to extend our earlier analysis ofthe links between the Faraday Rotation Measure of the quasars and the presenceof intervening MgII absorbing systems in their spectra. In contrast to the casewith strong MgII absorption systems W_0 > 0.3 \AA, the weaker systems do notcontribute significantly to the observed Rotation Measure of the backgroundquasars. This is possibly due to the higher impact parameters of the weaksystems compared to strong ones, suggesting that the high column densitymagnetized material that is responsible for the Faraday Rotation is locatedwithin about 50 kpc of the galaxies. Finally, we show that this result alsorules out the possibility that some unexpected secondary correlation betweenthe quasar redshift and its intrinsic Rotation Measure is responsible for theassociation of high Rotation Measure and strong intervening MgII absorptionthat we have presented elsewhere, since this would have produced an equaleffect for the weak absorption line systems, which exhibit a very similardistribution of quasar redshifts.

MgII absorption systems with W_0 > 0.1 \AA for a radio selected sample of 77 QSOs and their associated magnetic fields at high redshifts