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Paper: Dense Ionized Gas in the Nuclear Starburst Region of Arp 220
Volume: 320, The Neutral ISM in Starburst Galaxies
Page: 27
Authors: Yun, M.; Scoville, N.; Shukla, H.
Abstract: We have conducted H41α and 94 GHz continuum observations of the prototypical ULIRG Arp 220 in order to investigate the location and magnitude of the current massive star formation activity and the properties of the gas directly associated. Both the line and continuum emission are detected with a good S/N, and they are consistent with optically thin spontaneous emission near LTE condition. The mean density of the ionized gas (ne = 103−4 cm−3) is lower than that of the molecular gas, and the total ionized gas mass (MHII = (1 − 3) × 107 MSolar) is a few percent of the total molecular gas mass.
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