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The X-SHOOTER Lyman...
The X-SHOOTER Lyman α survey at z = 2 (XLS-z2) I : what makes a galaxy a Lyman α emitter?
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Matthee, Jorryt (författare)
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Sobral, David (författare)
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- Hayes, Matthew (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Pezzulli, Gabriele (författare)
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Gronke, Max (författare)
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Schaerer, Daniel (författare)
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Naidu, Rohan P. (författare)
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Röttgering, Huub (författare)
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Calhau, João (författare)
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Paulino-Afonso, Ana (författare)
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Santos, Sérgio (författare)
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Amorín, Ricardo (författare)
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(creator_code:org_t)
- 2021-05-10
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 505:1, s. 1382-1412
- Relaterad länk:
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https://scholarlypub...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present the first results from the X-SHOOTER Lyman α survey at z = 2 (XLS-z2). XLS-z2 is a deep spectroscopic survey of 35 Lyman α emitters (LAEs) utilizing ≈90 h of exposure time with Very Large Telescope/X-SHOOTER and covers rest-frame Ly α to H α emission with R ≈ 4000. 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 characterized by an interstellar medium with little dust, a low metallicity, and a high ionization state. The ionizing sources are young hot stars that power strong emission lines in the optical and high-ionization lines in the ultraviolet (UV). The LAEs exhibit clumpy UV morphologies and have outflowing kinematics with blueshifted Si ii absorption, a broad [O iii] component, and a red-skewed Ly α line. Typically, 30 per cent of the Ly α photons escape, of which one quarter on the blue side of the systemic velocity. A fraction of Ly α photons escape directly at the systemic suggesting clear channels enabling an ≈10 per cent escape of ionizing photons, consistent with an inference based on Mg ii. A combination of a low effective H i column density, a low dust content, and young starburst determines whether a star-forming galaxy is observed as an 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 109 M⊙.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- galaxies: formation
- galaxies: ISM
- galaxies: starburst
- dark ages
- reionization
- first stars
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Matthee, Jorryt
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Sobral, David
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Hayes, Matthew
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Pezzulli, Gabrie ...
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Gronke, Max
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Schaerer, Daniel
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visa fler...
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Naidu, Rohan P.
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Röttgering, Huub
-
Calhau, João
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Paulino-Afonso, ...
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Santos, Sérgio
-
Amorín, Ricardo
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visa färre...
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Stockholms universitet