Keck Absorption-Line Spectroscopy of Galactic Winds in Massive Infrared-Luminous Galaxies

Details Keck Absorption-Line Spectroscopy of Galactic Winds in Massive Infrared-Luminous Galaxies Keck Absorption-Line Spectroscopy of Galactic Winds in Massive Infrared-Luminous Galaxies

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..666..195r&link_type=abstract

THE EMERGENCE OF COSMIC STRUCTURE: Thirteenth Astrophysics Conference. AIP Conference Proceedings, Volume 666, pp. 195-198 (200

Astronomy and Astrophysics

Astrophysics

Starburst Galaxies And Infrared Excess Galaxies, Jets And Bursts, Galactic Winds And Fountains

Scientific paper

A proposed mechanism for the seeding of intergalactic space with metals and energy is outflows (winds) of gas from galaxies, powered by star formation and/or AGN activity. Using moderately-high resolution spectroscopy from Keck II, we observe blueshifted absorption in the Na I I D doublet in 8 of 11 starburst-dominated ultraluminous infrared galaxies at = 0.14. We interpret these blueshifts as outflows of warm neutral gas. Mass outflow rates for each source, when normalized to the corresponding global star formation rate, are 25% on average. The average escape fraction of the gas could be as high as 40 - 50%. Most effort to date has focused on the escape of mass, metals, and energy from small galaxies; if our results are confirmed, then very massive galaxies could play an important role in energizing and enriching the IGM.

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