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Properties of the cold interstellar medium of low-metallicity galaxies arenot well-known due to the faintness and extremely small scale on which emissionis expected. We present deep ALMA band 6 (230GHz) observations of the nearby,low-metallicity (12 + log(O/H) = 7.25) blue compact dwarf galaxy SBS0335-052 atan unprecedented resolution of 0.2 arcsec (52 pc). The 12CO J=2-1 line is notdetected and we report a 3-sigma upper limit of LCO(2-1) = 3.6x10^4 K km/spc^2. Assuming that molecular gas is converted into stars with a givendepletion time, ranging from 0.02 to 2 Gyr, we find lower limits on theCO-to-H2 conversion factor alpha_CO in the range 10^2-10^4 Msun pc^-2 (Kkm/s)^-1. The continuum emission is detected and resolved over the two mainsuper star clusters. Re-analysis of the IR-radio spectral energy distributionsuggests that the mm-fluxes are not only free-free emission but are most likelyalso associated with a cold dust component coincident with the position of thebrightest cluster. With standard dust properties, we estimate its mass to be aslarge as 10^5 Msun. Both line and continuum results suggest the presence of alarge cold gas reservoir unseen in CO even with ALMA.

New ALMA constraints on the star-forming ISM at low metallicity: A 50 pc view of the blue compact dwarf galaxy SBS0335-052