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    Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Jorryt Matthee, David Sobral, Behnam Darvish, Sérgio Santos, Bahram Mobasher, Ana Paulino-Afonso, Huub Röttgering, Lara Alegre; Spectroscopic properties of luminous Ly α emitters at z ≈ 6–7 and comparison to the Lyman-break population, Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 1, 21 November 2017, Pages 772–787, https://doi.org/10.1093/mnras/stx2061 is available online at: https://academic.oup.com/mnras/article/472/1/772/4082107/Spectroscopic-properties-of-luminous-Ly%CE%B1-emitters

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Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population

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Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population. / Matthee, Jorryt; Sobral, David; Darvish, Behnam; Da Graça Santos, Sergio; Mobasher, Bahram; Paulino-Afonso, Ana; Röttgering, Huub; Alegre, Lara.

In: Monthly Notices of the Royal Astronomical Society, Vol. 472, No. 1, 21.11.2017, p. 772-787.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Matthee, J, Sobral, D, Darvish, B, Da Graça Santos, S, Mobasher, B, Paulino-Afonso, A, Röttgering, H & Alegre, L 2017, 'Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population', Monthly Notices of the Royal Astronomical Society, vol. 472, no. 1, pp. 772-787. https://doi.org/10.1093/mnras/stx2061

APA

Matthee, J., Sobral, D., Darvish, B., Da Graça Santos, S., Mobasher, B., Paulino-Afonso, A., Röttgering, H., & Alegre, L. (2017). Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population. Monthly Notices of the Royal Astronomical Society, 472(1), 772-787. https://doi.org/10.1093/mnras/stx2061

Vancouver

Matthee J, Sobral D, Darvish B, Da Graça Santos S, Mobasher B, Paulino-Afonso A et al. Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population. Monthly Notices of the Royal Astronomical Society. 2017 Nov 21;472(1):772-787. https://doi.org/10.1093/mnras/stx2061

Author

Matthee, Jorryt ; Sobral, David ; Darvish, Behnam ; Da Graça Santos, Sergio ; Mobasher, Bahram ; Paulino-Afonso, Ana ; Röttgering, Huub ; Alegre, Lara. / Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 472, No. 1. pp. 772-787.

Bibtex

@article{32319d66a50b4bddb646642d1a7e8603,
title = "Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population",
abstract = "We present spectroscopic follow-up of candidate luminous Ly{\alpha} emitters (LAEs) at $z=5.7-6.6$ in the SA22 field with VLT/X-SHOOTER. We confirm two new luminous LAEs at $z=5.676$ (SR6) and $z=6.532$ (VR7), and also present HST follow-up of SR6. These sources have luminosities L$_{\rm Ly\alpha} \approx 3\times10^{43}$ erg s$^{-1}$, very high rest-frame equivalent widths of EW$_0\gtrsim 200$ {\AA} and narrow Ly{\alpha} lines (200-340 km s$^{-1}$). VR7 is the most UV-luminous LAE at $z>6.5$, with M$_{1500} = -22.5$, even brighter in the UV than CR7. Besides Ly{\alpha}, we do not detect any other rest-frame UV lines in the spectra of SR6 and VR7, and argue that rest-frame UV lines are easier to observe in bright galaxies with low Ly{\alpha} equivalent widths. We confirm that Ly{\alpha} line-widths increase with Ly{\alpha} luminosity at $z=5.7$, while the Ly$\alpha$ lines of faint LAEs become broader at $z=6.6$, potentially due to reionization. We find a large spread of up to 3 dex in UV luminosity for $>L^{\star}$ LAEs, but find that the Ly{\alpha} luminosity of the brightest LAEs is strongly related to UV luminosity at $z=6.6$. Under basic assumptions, we find that several LAEs at $z\approx6-7$ have Ly{\alpha} escape fractions $\gtrsim100$ %, indicating bursty star-formation histories, alternative Ly$\alpha$ production mechanisms, or dust attenuating Ly$\alpha$ emission differently than UV emission. Finally, we present a method to compute $\xi_{ion}$, the production efficiency of ionising photons, and find that LAEs at $z\approx6-7$ have high values of log$_{10}(\xi_{ion}$/Hz erg$^{-1}) \approx 25.51\pm0.09$ that may alleviate the need for high Lyman-Continuum escape fractions required for reionization.",
keywords = "astro-ph.GA",
author = "Jorryt Matthee and David Sobral and Behnam Darvish and {Da Gra{\c c}a Santos}, Sergio and Bahram Mobasher and Ana Paulino-Afonso and Huub R{\"o}ttgering and Lara Alegre",
note = "This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Jorryt Matthee, David Sobral, Behnam Darvish, S{\'e}rgio Santos, Bahram Mobasher, Ana Paulino-Afonso, Huub R{\"o}ttgering, Lara Alegre; Spectroscopic properties of luminous Ly α emitters at z ≈ 6–7 and comparison to the Lyman-break population, Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 1, 21 November 2017, Pages 772–787, https://doi.org/10.1093/mnras/stx2061 is available online at: https://academic.oup.com/mnras/article/472/1/772/4082107/Spectroscopic-properties-of-luminous-Ly%CE%B1-emitters",
year = "2017",
month = nov,
day = "21",
doi = "10.1093/mnras/stx2061",
language = "English",
volume = "472",
pages = "772--787",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "1",

}

RIS

TY - JOUR

T1 - Spectroscopic properties of luminous Lyman-α emitters at $z \approx 6 - 7$ and comparison to the Lyman-break population

AU - Matthee, Jorryt

AU - Sobral, David

AU - Darvish, Behnam

AU - Da Graça Santos, Sergio

AU - Mobasher, Bahram

AU - Paulino-Afonso, Ana

AU - Röttgering, Huub

AU - Alegre, Lara

N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Jorryt Matthee, David Sobral, Behnam Darvish, Sérgio Santos, Bahram Mobasher, Ana Paulino-Afonso, Huub Röttgering, Lara Alegre; Spectroscopic properties of luminous Ly α emitters at z ≈ 6–7 and comparison to the Lyman-break population, Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 1, 21 November 2017, Pages 772–787, https://doi.org/10.1093/mnras/stx2061 is available online at: https://academic.oup.com/mnras/article/472/1/772/4082107/Spectroscopic-properties-of-luminous-Ly%CE%B1-emitters

PY - 2017/11/21

Y1 - 2017/11/21

N2 - We present spectroscopic follow-up of candidate luminous Ly{\alpha} emitters (LAEs) at $z=5.7-6.6$ in the SA22 field with VLT/X-SHOOTER. We confirm two new luminous LAEs at $z=5.676$ (SR6) and $z=6.532$ (VR7), and also present HST follow-up of SR6. These sources have luminosities L$_{\rm Ly\alpha} \approx 3\times10^{43}$ erg s$^{-1}$, very high rest-frame equivalent widths of EW$_0\gtrsim 200$ {\AA} and narrow Ly{\alpha} lines (200-340 km s$^{-1}$). VR7 is the most UV-luminous LAE at $z>6.5$, with M$_{1500} = -22.5$, even brighter in the UV than CR7. Besides Ly{\alpha}, we do not detect any other rest-frame UV lines in the spectra of SR6 and VR7, and argue that rest-frame UV lines are easier to observe in bright galaxies with low Ly{\alpha} equivalent widths. We confirm that Ly{\alpha} line-widths increase with Ly{\alpha} luminosity at $z=5.7$, while the Ly$\alpha$ lines of faint LAEs become broader at $z=6.6$, potentially due to reionization. We find a large spread of up to 3 dex in UV luminosity for $>L^{\star}$ LAEs, but find that the Ly{\alpha} luminosity of the brightest LAEs is strongly related to UV luminosity at $z=6.6$. Under basic assumptions, we find that several LAEs at $z\approx6-7$ have Ly{\alpha} escape fractions $\gtrsim100$ %, indicating bursty star-formation histories, alternative Ly$\alpha$ production mechanisms, or dust attenuating Ly$\alpha$ emission differently than UV emission. Finally, we present a method to compute $\xi_{ion}$, the production efficiency of ionising photons, and find that LAEs at $z\approx6-7$ have high values of log$_{10}(\xi_{ion}$/Hz erg$^{-1}) \approx 25.51\pm0.09$ that may alleviate the need for high Lyman-Continuum escape fractions required for reionization.

AB - We present spectroscopic follow-up of candidate luminous Ly{\alpha} emitters (LAEs) at $z=5.7-6.6$ in the SA22 field with VLT/X-SHOOTER. We confirm two new luminous LAEs at $z=5.676$ (SR6) and $z=6.532$ (VR7), and also present HST follow-up of SR6. These sources have luminosities L$_{\rm Ly\alpha} \approx 3\times10^{43}$ erg s$^{-1}$, very high rest-frame equivalent widths of EW$_0\gtrsim 200$ {\AA} and narrow Ly{\alpha} lines (200-340 km s$^{-1}$). VR7 is the most UV-luminous LAE at $z>6.5$, with M$_{1500} = -22.5$, even brighter in the UV than CR7. Besides Ly{\alpha}, we do not detect any other rest-frame UV lines in the spectra of SR6 and VR7, and argue that rest-frame UV lines are easier to observe in bright galaxies with low Ly{\alpha} equivalent widths. We confirm that Ly{\alpha} line-widths increase with Ly{\alpha} luminosity at $z=5.7$, while the Ly$\alpha$ lines of faint LAEs become broader at $z=6.6$, potentially due to reionization. We find a large spread of up to 3 dex in UV luminosity for $>L^{\star}$ LAEs, but find that the Ly{\alpha} luminosity of the brightest LAEs is strongly related to UV luminosity at $z=6.6$. Under basic assumptions, we find that several LAEs at $z\approx6-7$ have Ly{\alpha} escape fractions $\gtrsim100$ %, indicating bursty star-formation histories, alternative Ly$\alpha$ production mechanisms, or dust attenuating Ly$\alpha$ emission differently than UV emission. Finally, we present a method to compute $\xi_{ion}$, the production efficiency of ionising photons, and find that LAEs at $z\approx6-7$ have high values of log$_{10}(\xi_{ion}$/Hz erg$^{-1}) \approx 25.51\pm0.09$ that may alleviate the need for high Lyman-Continuum escape fractions required for reionization.

KW - astro-ph.GA

U2 - 10.1093/mnras/stx2061

DO - 10.1093/mnras/stx2061

M3 - Journal article

VL - 472

SP - 772

EP - 787

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -