Kavli Affiliate: Michael Gladders
| First 5 Authors: Alexander Navarre, Gourav Khullar, Matthew Bayliss, Håkon Dahle, Michael Florian
| Summary:
We present six strongly gravitationally lensed Ly-$alpha$ Emitters (LAEs) at
$zsim4-5$ with HST narrowband imaging isolating Ly-$alpha$. Through complex
radiative transfer Ly-$alpha$ encodes information about the spatial
distribution and kinematics of the neutral hydrogen upon which it scatters. We
investigate the galaxy properties and Ly-$alpha$ morphologies of our sample.
Many previous studies of high-redshift LAEs have been limited in Ly-$alpha$
spatial resolution. In this work we take advantage of high-resolution
Ly-$alpha$ imaging boosted by lensing magnification, allowing us to probe
sub-galactic scales that are otherwise inaccessible at these redshifts. We use
broadband imaging from HST (rest-frame UV) and Spitzer (rest-frame optical) in
SED fitting; providing estimates on the stellar masses ($sim 10^8 – 10^9
M_{odot}$), stellar population ages ($t_{50} <40$ Myr), and amounts of dust
($A_V sim 0.1 – 0.6$, statistically consistent with zero). We employ
non-parametric star-formation histories to probe the young stellar-populations
which create Ly-$alpha$. We also examine the offsets between the Ly-$alpha$
and stellar continuum, finding small upper limits of offsets ($< 0.1"$)
consistent with studies of low-redshift LAEs; indicating our galaxies are not
interacting or merging. Finally, we find a bimodality in our sample’s
Ly-$alpha$ morphologies: clumpy and extended. We find a suggestive trend: our
LAEs with clumpy Ly-$alpha$ are generally younger than the LAEs with extended
Ly-$alpha$, suggesting a possible correlation with age.
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