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We use the Vista Variables in the Via Lactea (VVV) ESO public survey data tomeasure extinction values in the complete area of the Galactic bulge covered bythe survey at high resolution. We derive reddening values using the methoddescribed in Paper I. This is based on measuring the mean (J-Ks) color of redclump giants in small subfields of 2' to 6' in the following bulge area:-10.3<b<+5.1 and -10<l<+10.4. To determine the reddening values E(J-Ks) foreach region, we measure the RC color and compare it to the (J-Ks) color of RCstars measured in Baade's window, for which we adopt E(B-V)=0.55. This allowsus to construct a reddening map sensitive to small scale variations minimizingthe problems arising from differential extinction. The significant reddeningvariations are clearly observed on spatial scales as small as 2'. We find agood agreement between our extinction measurements and Schlegel maps in theouter bulge, but, as already stated in the literature the Schlegel maps are notreliable for regions within |b| < 6. In the inner regions we compare ourresults with maps derived from DENIS and Spitzer surveys. While we find goodagreement with other studies in the corresponding overlapping regions, ourextinction map has better quality due to both higher resolution and a morecomplete spatial coverage in the Bulge. We investigate the importance ofdifferential reddening and demonstrate the need for high resolution extinctionmaps for detailed studies of Bulge stellar populations and structure. Theextinction variations on scales of up to 2'-6', must be taken into account whenanalysing the stellar populations of the Bulge.

astronomy and astrophysics

Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS  II. The complete high resolution extinction map and implications for Bulge  studies