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The large, oxygen-rich halos of star-forming galaxies are a major reservoir of Galactic metals

The large, oxygen-rich halos of star-forming galaxies are a major reservoir of Galactic metals

Publication date: 18 November 2011

Authors: Tumlinson, J., et al.

Journal: Science
Volume: 334
Issue: 6058
Page: 948-952
Year: 2011

Copyright: AAAS

The circumgalactic medium (CGM) is fed by galaxy outflows and accretion of intergalactic gas, but its mass, heavy element enrichment, and relation to galaxy properties are poorly constrained by observations. In a survey of the outskirts of 42 galaxies with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we detected ubiquitous, large (150-kiloparsec) halos of ionized oxygen surrounding star-forming galaxies; we found much less ionized oxygen around galaxies with little or no star formation. This ionized CGM contains a substantial mass of heavy elements and gas, perhaps far exceeding the reservoirs of gas in the galaxies themselves. Our data indicate that it is a basic component of nearly all star-forming galaxies that is removed or transformed during the quenching of star formation and the transition to passive evolution.

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