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The extent of chemically enriched gas around star-forming dwarf galaxies
Sean D. Johnson, Hsiao-Wen Chen, John S. Mulchaey +2
Supernova driven winds are often invoked to remove chemically enriched gas from dwarf galaxies to match their low observed metallicities. In such shallow potential wells, outflows…
HST Detection of Extended Neutral Hydrogen in a Massive Elliptical at z = 0.4
Fakhri S. Zahedy, Hsiao-Wen Chen, Michael Rauch +1
We report the first detection of extended neutral hydrogen (HI) gas in the interstellar medium (ISM) of a massive elliptical galaxy beyond z~0. The observations utilize the doubly…
Gauging Metallicity of Diffuse Gas Under An Uncertain Ionizing Radiation Field
Hsiao-Wen Chen, Sean D. Johnson, Fakhri S. Zahedy +2
Gas metallicity is a key quantity used to determine the physical conditions of gaseous clouds in a wide range of astronomical environments, including interstellar and intergalactic…