Fig. 3.
ISM properties in the Circinus galaxy. Top panel: map of the total extinction in V band AV obtained from the Balmer decrement Hα/Hβ. Only spaxels with Hα and HβS/N > 5 are shown. Central panel: map of the total electron density measured from the [S II]λ6717/[S II]λ6731 ratio. Only spaxels with [S II]λ6717 and [S II]λ6731 S/N > 5 are shown. Bottom panel: map of the [S III]λλ9069,9532/[S II]λλ6717,31 ratio, proxy for the ionisation parameter. Only spaxels with [S III]λλ9069,9532 and [S II]λλ6717,31 S/N > 5 are shown.
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