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Fig. 10

image

Integral of the SFR, ψ(t), for the young (from 0.5 Gyr to date; black dots) and intermediate-to-old (between 0.5 and 13.5 Gyr ago; grey squares) stellar populations, as a function of the galactocentric distance. Upper panel: the absolute value of the galactocentric distance is shown in the horizontal axis. Distances are given both in degrees (lower axis scale) and in parsecs (upper axis scale). Distances in parsecs have been obtained assuming a distance to NGC 6822 of 510 kpc (Paper I). The solid lines show the best fit of the points in the two time intervals, with the associated errors (dotted lines). Fields 1 and 3 were excluded from the fit in the case of the young stellar population. The resulting scale length r0 and the name of the field are indicated. Lower panel: same as the upper panel, but the galactocentric distances are shown as they appear along the galactic semi-major axis (negative and positive values corresponding to eastern and western fields, respectively). Points have been shifted vertically in order to make the older and younger distribution barycentres coincide. The vertical scale zeropoint is arbitrary. Grey lines reproduce the fit shown in the upper panel for the older population. The colour coding is the same a in the upper panel.

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