Journal
ASTROPHYSICAL JOURNAL
Volume 770, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/770/1/41
Keywords
galaxies: evolution; galaxies: halos; galaxies: starburst; ISM: jets and outflows; scattering; surveys; ultraviolet: galaxies; ultraviolet: ISM
Categories
Funding
- National Science Foundation [AST-1109288, NSF PHY05-51164]
- David & Lucile Packard Foundation
- Alfred P. Sloan Foundation
- NSF CAREER award [AST-1055081]
- Dissertation Year Fellowship at UCLA
- NSF Graduate Research Fellowship Program
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109288] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1055081] Funding Source: National Science Foundation
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Mapping Mg II resonance emission scattered by galactic winds offers a means to determine the spatial extent and density of the warm outflow. Using Keck/LRIS spectroscopy, we have resolved scattered Mg II emission to the east of 32016857, a star-forming galaxy at z = 0.9392 with an outflow. The Mg II emission from this galaxy exhibits a P-Cygni profile, extends further than both the continuum and [O II] emission along the eastern side of the slit, and has a constant Doppler shift along the slit which does not follow the velocity gradient of the nebular [O II] emission. Using the Sobolev approximation, we derive the density of Mg+ ions at a radius of 12-18 kpc in the outflow. We model the ionization correction and find that much of the outflowing Mg is in Mg++. We estimate that the total mass flux could be as large as 330-500 M-circle dot yr(-1), with the largest uncertainties coming from the depletion of Mg onto grains and the clumpiness of the warm outflow. We show that confining the warm clouds with a hot wind reduces the estimated mass flux of the warm outflow and indicates a mass-loading factor near unity in the warm phase alone. Based on the high blue luminosities that distinguish 32016857 and TKRS 4389, described by Rubin et al., from other galaxies with P-Cygni emission, we suggest that, as sensitivity to diffuse emission improves, scattering halos may prove to be a generic property of star-forming galaxies at intermediate redshifts.
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