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This study presents the first millimeter continuum mapping observations oftwo nearby galaxies, the starburst spiral galaxy NGC2146 and the dwarf galaxyNGC2976, at 1.15 mm and 2 mm using the NIKA2 camera on the IRAM 30m telescope,as part of the Guaranteed Time Large Project IMEGIN. These observations providerobust resolved information about the physical properties of dust in nearbygalaxies by constraining their FIR-radio SED in the millimeter domain. Aftersubtracting the contribution from the CO line emission, the SEDs are modeledspatially using a Bayesian approach. Maps of dust mass surface density,temperature, emissivity index, and thermal radio component of the galaxies arepresented, allowing for a study of the relations between the dust propertiesand star formation activity (using observations at 24$\mu$m as a tracer). Wereport that dust temperature is correlated with star formation rate in bothgalaxies. The effect of star formation activity on dust temperature is strongerin NGC2976, an indication of the thinner interstellar medium of dwarf galaxies.Moreover, an anti-correlation trend is reported between the dust emissivityindex and temperature in both galaxies.

Constraining Millimeter Dust Emission in Nearby Galaxies with NIKA2: the case of NGC2146 and NGC2976