Kavli Affiliate: Michael Gladders
| First 5 Authors: Manuel Solimano, Jorge González-López, Manuel Aravena, Evelyn Johnston, Cristóbal Moya-Sierralta
| Summary:
Spatially extended halos of Lyman Alpha (Ly$alpha$) emission are now
ubiquitously found around high-redshift star-forming galaxies. But our
understanding of the nature and powering mechanisms of these halos is still
hampered by the complex radiative transfer effects of the Ly$alpha$ line and
limited angular resolution. In this paper, we present resolved Multi Unit
Spectroscopic Explorer (MUSE) observations of SGAS J122651.3+215220, a
strongly-lensed pair of L* galaxies at z=2.92 embedded in a Ly$alpha$ halo of
$L_{mathrm{Ly}alpha}=(6.2pm1.3)times
10^{42},mathrm{erg},mathrm{s}^{-1}$. Globally, the system shows a line
profile that is markedly asymmetric and redshifted, but its width and peak
shift vary significantly across the halo. By fitting the spatially binned
Ly$alpha$ spectra with a collection of radiative transfer galactic wind
models, we infer a mean outflow expansion velocity of $approx$ 211 km/s, with
higher values preferentially found on both sides of the system’s major axis.
The velocity of the outflow is validated with the blueshift of low ionization
metal absorption lines in the spectra of the central galaxies. We also identify
a faint ($M_{1500}approx -16.7$) companion detected in both Ly$alpha$ and
continuum, whose properties are in agreement with a predicted population of
satellite galaxies that contribute to the extended Ly$alpha$ emission.
Finally, we briefly discuss the impact of the interaction between the central
galaxies on the properties of the halo and the possibility of in situ
fluorescent Ly$alpha$ production.
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