The Star-Forming Interstellar Medium of Lyman Break Galaxy Analogs
John F. Wu, Andrew J. Baker, Timothy M. Heckman, Erin K. S. Hicks,, Dieter Lutz, Linda J. Tacconi

TL;DR
This study uses near-infrared spectroscopy to analyze six local galaxy analogs of high-redshift Lyman break galaxies, revealing their star formation activity, feedback processes, and possible AGN influence.
Contribution
It provides detailed spectroscopic insights into the physical conditions and feedback mechanisms in local Lyman break galaxy analogs, a novel approach for understanding high-redshift galaxy properties.
Findings
High velocity dispersions and low rotation in gas kinematics.
Nebular color excesses are lower than continuum excesses, unlike typical local systems.
Evidence of AGN activity and strong star formation feedback.
Abstract
We present VLT/SINFONI near-infrared (NIR) integral field spectroscopy of six Lyman break galaxy "analogs" (LBAs), from which we detect HI, HeI, and [FeII] recombination lines, and multiple H ro-vibrational lines in emission. Pa kinematics reveal high velocity dispersions and low rotational velocities relative to random motions (). Matched-aperture comparisons of H, H, and Pa reveal that the nebular color excesses are lower relative to the continuum color excesses than is the case for typical local star-forming systems. We compare observed HeI/HI recombination line ratios to photoionization models to gauge the effective temperatures (T) of massive ionizing stars, finding the properties of at least one LBA are consistent with extra heating from an active galactic nucleus (AGN) and/or an…
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