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most citedThe Evolution of Normal Galaxy X-ray Emission Through Cosmic History: Constraints from the 6 Ms Chandra Deep Field-South

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astro-ph2000★ 22 cited

A comparison between Pa alpha and H alpha emission: The relation between HII region mean reddening, local gas density and metallicity

A. C. Quillen, Mihoko Yukita

We measure reddenings to HII regions in NGC 2903, NGC 1512, M51, NGC 4449 and NGC 6946 from Hubble Space Telescope Pa alpha and H alpha images. Extinctions range from A_V ~ 5 - 0 d…