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The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-$α$ emitters

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The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I : the panchromatic spectrum of typical Lyman-$α$ emitters. / Matthee, Jorryt; Sobral, David; Hayes, Matthew; Pezzulli, Gabriele; Gronke, Max; Schaerer, Daniel; Naidu, Rohan P.; Röttgering, Huub; Calhau, João; Paulino-Afonso, Ana; Santos, Sérgio; Amorín, Ricardo.

In: Monthly Notices of the Royal Astronomical Society, 04.05.2021.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Matthee, J, Sobral, D, Hayes, M, Pezzulli, G, Gronke, M, Schaerer, D, Naidu, RP, Röttgering, H, Calhau, J, Paulino-Afonso, A, Santos, S & Amorín, R 2021, 'The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-$α$ emitters', Monthly Notices of the Royal Astronomical Society.

APA

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. (Accepted/In press). The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-$α$ emitters. Monthly Notices of the Royal Astronomical Society.

Vancouver

Matthee J, Sobral D, Hayes M, Pezzulli G, Gronke M, Schaerer D et al. The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-$α$ emitters. Monthly Notices of the Royal Astronomical Society. 2021 May 4.

Author

Matthee, Jorryt ; Sobral, David ; Hayes, Matthew ; Pezzulli, Gabriele ; Gronke, Max ; Schaerer, Daniel ; Naidu, Rohan P. ; Röttgering, Huub ; Calhau, João ; Paulino-Afonso, Ana ; Santos, Sérgio ; Amorín, Ricardo. / The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I : the panchromatic spectrum of typical Lyman-$α$ emitters. In: Monthly Notices of the Royal Astronomical Society. 2021.

Bibtex

@article{209bd989ad8e4414b7b7e8e80b1bfd1c,
title = "The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I: the panchromatic spectrum of typical Lyman-$α$ emitters",
abstract = " We present the first results from the X-SHOOTER Lyman-$\alpha$ survey at $z=2$ (XLS-$z2$). XLS-$z2$ is a deep spectroscopic survey of 35 Lyman-$\alpha$ emitters (LAEs) utilising $\approx90$ hours of exposure time with VLT/X-SHOOTER and covers rest-frame Ly$\alpha$ to H$\alpha$ emission with R$\approx4000$. 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$\alpha$ line. Typically 30 % of the Ly$\alpha$ photons escape, of which one quarter on the blue side of the systemic velocity. A fraction of Ly$\alpha$ photons escapes directly at the systemic suggesting clear channels enabling a $\approx10$ % 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$^9$ M$_{\odot}$. ",
keywords = "astro-ph.GA",
author = "Jorryt Matthee and David Sobral and Matthew Hayes and Gabriele Pezzulli and Max Gronke and Daniel Schaerer and Naidu, {Rohan P.} and Huub R{\"o}ttgering and Jo{\~a}o Calhau and Ana Paulino-Afonso and S{\'e}rgio Santos and Ricardo Amor{\'i}n",
year = "2021",
month = may,
day = "4",
language = "English",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",

}

RIS

TY - JOUR

T1 - The X-SHOOTER Lyman-$α$ survey at z=2 (XLS-z2) I

T2 - the panchromatic spectrum of typical Lyman-$α$ emitters

AU - Matthee, Jorryt

AU - Sobral, David

AU - Hayes, Matthew

AU - Pezzulli, Gabriele

AU - Gronke, Max

AU - Schaerer, Daniel

AU - Naidu, Rohan P.

AU - Röttgering, Huub

AU - Calhau, João

AU - Paulino-Afonso, Ana

AU - Santos, Sérgio

AU - Amorín, Ricardo

PY - 2021/5/4

Y1 - 2021/5/4

N2 - We present the first results from the X-SHOOTER Lyman-$\alpha$ survey at $z=2$ (XLS-$z2$). XLS-$z2$ is a deep spectroscopic survey of 35 Lyman-$\alpha$ emitters (LAEs) utilising $\approx90$ hours of exposure time with VLT/X-SHOOTER and covers rest-frame Ly$\alpha$ to H$\alpha$ emission with R$\approx4000$. 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$\alpha$ line. Typically 30 % of the Ly$\alpha$ photons escape, of which one quarter on the blue side of the systemic velocity. A fraction of Ly$\alpha$ photons escapes directly at the systemic suggesting clear channels enabling a $\approx10$ % 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$^9$ M$_{\odot}$.

AB - We present the first results from the X-SHOOTER Lyman-$\alpha$ survey at $z=2$ (XLS-$z2$). XLS-$z2$ is a deep spectroscopic survey of 35 Lyman-$\alpha$ emitters (LAEs) utilising $\approx90$ hours of exposure time with VLT/X-SHOOTER and covers rest-frame Ly$\alpha$ to H$\alpha$ emission with R$\approx4000$. 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$\alpha$ line. Typically 30 % of the Ly$\alpha$ photons escape, of which one quarter on the blue side of the systemic velocity. A fraction of Ly$\alpha$ photons escapes directly at the systemic suggesting clear channels enabling a $\approx10$ % 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$^9$ M$_{\odot}$.

KW - astro-ph.GA

M3 - Journal article

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -