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We present Atacama Large Millimeter/submillimeter Array observations of 99.02GHz free-free and H40$\alpha$ emission from the centre of the nearby starburstgalaxy NGC 253. We calculate electron temperatures of 3700-4500 K for thephotoionized gas, which agrees with previous measurements. We measure aphotoionizing photon production rate of $(3.2\pm0.2)\times10^{53}$ s$^{-1}$ anda star formation rate of $1.73\pm0.12$ M$_\odot$ yr$^{-1}$ within the central20$\times$10 arcsec, which fall within the broad range of measurements fromprevious millimetre and radio observations but which are better constrained. Wealso demonstrate that the dust opacities are ~3 dex higher than inferred fromprevious near-infrared data, which illustrates the benefits of using millimetrestar formation tracers in very dusty sources.

ALMA observations of 99 GHz free-free and H40$\alpha$ line emission from star formation in the centre of NGC 253