Ubiquitous Outflows From Star-forming Galaxies At Z=1.4 In The Deep2 Survey

Details Ubiquitous Outflows From Star-forming Galaxies At Z=1.4 In The Deep2 Survey Ubiquitous Outflows From Star-forming Galaxies At Z=1.4 In The Deep2 Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.3705w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #37.05; Bulletin of the American Astronomical Society, Vol. 39, p.790

Astronomy and Astrophysics

Astronomy

Scientific paper

Galactic-scale winds or outflows have been observed locally in dwarfs and in IR-luminous galaxies, and at high redshift in luminous Lyman-break galaxies. Many of the non-dwarf objects that show prominent winds are extreme starbursts or merger-driven. We use galaxy spectra from the DEEP2 redshift survey to show that blueshifted Mg II absorption is very common in star-forming galaxies at z=1.4. The Mg II absorption is essentially saturated, implying high column densities of low-ionization outflow. The outflows have characteristic velocities of 300-500 km/sec, with absorption seen out to 1000 km/sec in the most massive galaxy sample. Both the Mg II wind opacity and the velocity are larger for galaxies of higher stellar mass and star formation rate. These observations imply that galactic-scale winds driven by star formation do occur in and may escape high-mass galaxies, and that winds are part of the past history of most star-forming galaxies, including the progenitors of Milky Way-type galaxies, not just those that have undergone major mergers.
This research has been supported by the NSF and by NASA through a contract issued by JPL/Caltech.

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