Werk, J; Putman, Mary E; Meurer, Gerhardt; Oey, M. S.; Ryan-Weber, E V; Kennicutt, Robert C; Freeman, Kenneth
HST ACS HRC images in UV (F250W), V (F555W), and I (F814W) resolve three isolated OB associations that lie up to 30 kpc from the stellar disk of the S0 galaxy NGC 1533. Previous narrowband Ha imaging and optical spectroscopy showed these objects as unresolved intergalactic H II regions having Hα luminosities consistent with single early-type O stars. These young stars lie in stripped H I gas with column densities ranging from 1.5 to 2.5 × 10 20 cm -2 and velocity dispersions near 30 km s -1....[Show more]
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