ALMA observations of 99 GHz free–free and H40α line emission from star formation in the centre of NGC 253
ALMA observations of 99 GHz free–free and H40α line emission from star formation in the centre of NGC 253
Abstract We present Atacama Large Millimeter/submillimeter Array observations of 99.02 GHz free–free and H40α emission from the centre of the nearby starburst galaxy NGC 253. We calculate electron temperatures of 3700–4500 K for the photoionized gas, which agrees with previous measurements. We measure a photoionizing photon production rate of (3.2 …