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Investigating star formation requires precise knowledge of the properties ofthe dense molecular gas. The low metallicity and wide range of star formationactivity of the Large and Small Magellanic Clouds make them prime laboratoriesto study how local physical conditions impact the dense gas reservoirs. The aimof the Dense Gas Survey for the Magellanic Clouds (DeGaS-MC) project is toexpand our knowledge of the relation between dense gas properties and starformation activity by targeting the LMC and SMC observed in the HCO+(2-1) andHCN(2-1) transitions. We carried out a pointing survey toward 30 LMC and SMCmolecular clouds using the SEPIA180 instrument installed on the APEX telescopeand a follow-up mapping campaign in 13 star-forming regions. This first paperprovides line characteristic catalogs and integrated line-intensity maps of thesources. HCO+(2-1) is detected in 20 and HCN(2-1) in 8 of the 29 pointingsobserved. The dense gas velocity pattern follows the line-of-sight velocityfield derived from the stellar population. The HCN emission is less extendedthan the HCO+ emission. The HCO+(2-1)/HCN(2-1) brightness temperature ratiosrange from 1 to 7, which is consistent with the large ratios commonly observedin low-metallicity environments. A larger number of young stellar objects arefound at high HCO+ intensities and lower HCO+/HCN flux ratios, and thus towarddenser lines of sight. The dense gas luminosities correlate with the starformation rate traced by the total infrared luminosity over the two orders ofmagnitude covered by our observations, although substantial region-to-regionvariations are observed.

DeGaS-MC: Dense Gas Survey in the Magellanic Clouds I -- An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC