Spatially Resolved Galactic Wind in Lensed Galaxy RCSGA 032727-132609
Rongmon Bordoloi, Jane R. Rigby, Jason Tumlinson, Matthew B. Bayliss,, Keren Sharon, Michael D. Gladders, Eva Wuyts

TL;DR
This study uses gravitational lensing to spatially resolve galactic outflows in a z=1.70 star-forming galaxy, revealing local outflow properties driven by star formation clumps and their significant impact on galaxy evolution.
Contribution
First spatially resolved analysis of galactic winds in a high-redshift galaxy using MgII and FeII tracers, showing local outflow dominance and detailed velocity structures.
Findings
Galactic outflows have velocities of -170 to -250 km/sec.
Mass outflow rates are > 30-50 solar masses per year.
Outflows are locally sourced, not galaxy-wide.
Abstract
We probe the spatial distribution of outflowing gas along four lines of sight separated by up to 6 kpc in a gravitationally-lensed star-forming galaxy at z=1.70. Using MgII and FeII emission and absorption as tracers, we find that the clumps of star formation are driving galactic outflows with velocities of -170 to -250 km/sec. The velocities of MgII emission are redshifted with respect to the systemic velocities of the galaxy, consistent with being back-scattered. By contrast, the FeII fluorescent emission lines are either slightly blueshifted or at the systemic velocity of the galaxy. Taken together, the velocity structure of the MgII and FeII emission is consistent with arising through scattering in galactic winds. Assuming a thin shell geometry for the out owing gas, the estimated masses carried out by these outfows are large (> 30 - 50 ), with mass loading…
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