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We present two-dimensional spectroscopy of the extremely metal-deficient bluecompact dwarf (BCD) galaxy SBS 0335-052E aiming to studyphysical conditions,element abundances and kinematical properties of the ionised gas in thisgalaxy. Observations were obtained in the spectral range 3620-9400A with theimaging spectrograph GIRAFFE installed on the UT2 of the Very Large Telescope(VLT). These observations are the first ones carried out so far with GIRAFFE inthe ARGUS mode which allows to obtain simultaneously 308 spectra covering a11.4"x7.3" region. We produced images of SBS 0335-052E in the continuum and inemission lines of different stages of excitation. We find that while themaximum of emission in the majority of lines, including the strong lines Hbeta4861A, Halpha 6563A, [OIII] 4363,5007A, [OII] 3726,3729A, coincides with theyoungest south-eastern star clusters 1 and 2, the emission of HeII 4686A lineis offset to the more evolved north-west clusters 4,5. This suggests that hardionising radiation responsible for the HeII 4686A emission is not related tothe most massive youngest stars, but rather is connected with fast radiativeshocks. This conclusion is supported by the kinematical properties of theionised gas from the different emission lines as the velocity dispersion in theHeII 4686A line is systematically higher, by ~50%-100%, than that in otherlines. The variations of the emission line profiles suggest the presence of anionised gas outflow in the direction perpendicular to the galaxy disk.(abridged)Comment: 21 pages, 11 figures, accepted for publication in Astronomy and  Astrophysic

VLT/GIRAFFE spectroscopic observations of the metal-poor blue compact dwarf galaxy SBS 0335–052E