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Dwarf spheroidal (dSph) galaxies are key objects in near-field cosmology,especially in connection to the study of galaxy formation and evolution atsmall scales. In addition, dSphs are optimal targets to investigate the natureof dark matter. However, while we begin to have deep optical photometricobservations of the stellar population in these objects, little is known so farabout their diffuse emission at any observing frequency, and hence on thermaland non-thermal plasma possibly residing within dSphs. In this paper, wepresent deep radio observations of six local dSphs performed with the AustraliaTelescope Compact Array at 16 cm wavelength. We mosaiced a region of radius ofabout one degree around three "classical" dSphs, Carina, Fornax, and Sculptor,and of about half of degree around three "ultra-faint" dSphs, BootesII, Segue2,and Hercules. The rms noise level is below 0.05 mJy for all the maps. Therestoring beams FWHM ranged from 4.2 x 2.5 arcseconds to 30.0 x 2.1 arcsecondsin the most elongated case. A catalogue including the 1392 sources detected inthe six dSph fields is reported. The main properties of the background sourcesare discussed, with positions and fluxes of brightest objects compared with theFIRST, NVSS, and SUMSS observations of the same fields. The observed populationof radio emitters in these fields is dominated by synchrotron sources. Wecompute the associated source number counts at 2 GHz down to fluxes of 0.25mJy, which prove to be in agreement with AGN count models.

Local Group dSph radio survey with ATCA (I): Observations and background sources