The X-SHOOTER Lyman-\${\textbackslash}alpha\$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-\${\textbackslash}alpha\$ emitters. Matthee, J., Sobral, D., Hayes, M., Pezzulli, G., Gronke, M., Schaerer, D., Naidu, R. P., Röttgering, H., Calhau, J., Paulino-Afonso, A., Santos, S., & Amorín, R. arXiv e-prints, 2102:arXiv:2102.07779, February, 2021.
The X-SHOOTER Lyman-\${\textbackslash}alpha\$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-\${\textbackslash}alpha\$ emitters [link]Paper  abstract   bibtex   
We present the first results from the X-SHOOTER Lyman-\${\textbackslash}alpha\$ survey at \$z=2\$ (XLS-\$z2\$). XLS-\$z2\$ is a deep spectroscopic survey of 35 Lyman-\${\textbackslash}alpha\$ emitters (LAEs) utilising \${\textbackslash}approx90\$ hours of exposure time with VLT/X-SHOOTER and covers rest-frame Ly\${\textbackslash}alpha\$ to H\${\textbackslash}alpha\$ emission with R\${\textbackslash}approx4000\$. We present the sample selection, the observations and the data reduction. Systemic redshifts are measured from rest-frame optical lines for 33/35 sources. In the stacked spectrum, our LAEs are characterised by an interstellar medium with little dust, a low metallicity and a high ionisation state. The ionising sources are young hot stars that power strong emission-lines in the optical and high ionisation lines in the UV. The LAEs exhibit clumpy UV morphologies and have outflowing kinematics with blue-shifted SiII absorption, a broad [OIII] component and a red-skewed Ly\${\textbackslash}alpha\$ line. Typically 30 % of the Ly\${\textbackslash}alpha\$ photons escape, of which one quarter on the blue side of the systemic velocity. A fraction of Ly\${\textbackslash}alpha\$ photons escapes directly at the systemic suggesting clear channels enabling a \${\textbackslash}approx10\$ % escape of ionising photons, consistent with an inference based on MgII. A combination of a low effective HI column density, a low dust content and young star-burst determine whether a star forming galaxy is observed as a LAE. The first is possibly related to outflows and/or a fortunate viewing angle, while we find that the latter two in LAEs are typical for their stellar mass of 10\${\textasciicircum}9\$ M\$_\{{\textbackslash}odot\}\$.
@article{matthee_x-shooter_2021,
	title = {The {X}-{SHOOTER} {Lyman}-\${\textbackslash}alpha\$ survey at z=2 ({XLS}-z2) {I}: the panchromatic spectrum of typical {Lyman}-\${\textbackslash}alpha\$ emitters},
	volume = {2102},
	shorttitle = {The {X}-{SHOOTER} {Lyman}-\${\textbackslash}alpha\$ survey at z=2 ({XLS}-z2) {I}},
	url = {http://adsabs.harvard.edu/abs/2021arXiv210207779M},
	abstract = {We present the first results from the X-SHOOTER Lyman-\${\textbackslash}alpha\$ survey at 
\$z=2\$ (XLS-\$z2\$). XLS-\$z2\$ is a deep spectroscopic survey of 35
Lyman-\${\textbackslash}alpha\$ emitters (LAEs) utilising \${\textbackslash}approx90\$ hours of exposure
time with VLT/X-SHOOTER and covers rest-frame Ly\${\textbackslash}alpha\$ to H\${\textbackslash}alpha\$
emission with R\${\textbackslash}approx4000\$. We present the sample selection, the
observations and the data reduction. Systemic redshifts are measured
from rest-frame optical lines for 33/35 sources. In the stacked
spectrum, our LAEs are characterised by an interstellar medium with
little dust, a low metallicity and a high ionisation state. The ionising
sources are young hot stars that power strong emission-lines in the
optical and high ionisation lines in the UV. The LAEs exhibit clumpy UV
morphologies and have outflowing kinematics with blue-shifted SiII
absorption, a broad [OIII] component and a red-skewed Ly\${\textbackslash}alpha\$ line.
Typically 30 \% of the Ly\${\textbackslash}alpha\$ photons escape, of which one quarter on
the blue side of the systemic velocity. A fraction of Ly\${\textbackslash}alpha\$ photons
escapes directly at the systemic suggesting clear channels enabling a
\${\textbackslash}approx10\$ \% escape of ionising photons, consistent with an inference
based on MgII. A combination of a low effective HI column density, a low
dust content and young star-burst determine whether a star forming
galaxy is observed as a LAE. The first is possibly related to outflows
and/or a fortunate viewing angle, while we find that the latter two in
LAEs are typical for their stellar mass of 10\${\textasciicircum}9\$ M\$\_\{{\textbackslash}odot\}\$.},
	urldate = {2021-02-24},
	journal = {arXiv e-prints},
	author = {Matthee, Jorryt and Sobral, David and Hayes, Matthew and Pezzulli, Gabriele and Gronke, Max and Schaerer, Daniel and Naidu, Rohan P. and Röttgering, Huub and Calhau, João and Paulino-Afonso, Ana and Santos, Sérgio and Amorín, Ricardo},
	month = feb,
	year = {2021},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:2102.07779},
}

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