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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 S Santos, D Sobral, J Matthee, J Calhau, E da Cunha, B Ribeiro, A Paulino-Afonso, P Arrabal Haro, J Butterworth, The evolution of rest-frame UV properties, Ly α EWs, and the SFR–stellar mass relation at z ∼ 2–6 for SC4K LAEs, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, March 2020, Pages 141–160, https://doi.org/10.1093/mnras/staa093 is available online at: https://academic.oup.com/mnras/article/493/1/141/5704403

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The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs

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The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs. / Santos, Sérgio; Sobral, David; Matthee, Jorryt; Calhau, João; Cunha, Elisabete da; Ribeiro, Bruno; Paulino-Afonso, Ana; Haro, Pablo Arrabal; Butterworth, Josh.

In: Monthly Notices of the Royal Astronomical Society, Vol. 493, No. 1, 01.03.2020, p. 141-160.

Research output: Contribution to journalJournal article

Harvard

Santos, S, Sobral, D, Matthee, J, Calhau, J, Cunha, ED, Ribeiro, B, Paulino-Afonso, A, Haro, PA & Butterworth, J 2020, 'The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs', Monthly Notices of the Royal Astronomical Society, vol. 493, no. 1, pp. 141-160. https://doi.org/10.1093/mnras/staa093

APA

Santos, S., Sobral, D., Matthee, J., Calhau, J., Cunha, E. D., Ribeiro, B., Paulino-Afonso, A., Haro, P. A., & Butterworth, J. (2020). The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs. Monthly Notices of the Royal Astronomical Society, 493(1), 141-160. https://doi.org/10.1093/mnras/staa093

Vancouver

Santos S, Sobral D, Matthee J, Calhau J, Cunha ED, Ribeiro B et al. The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs. Monthly Notices of the Royal Astronomical Society. 2020 Mar 1;493(1):141-160. https://doi.org/10.1093/mnras/staa093

Author

Santos, Sérgio ; Sobral, David ; Matthee, Jorryt ; Calhau, João ; Cunha, Elisabete da ; Ribeiro, Bruno ; Paulino-Afonso, Ana ; Haro, Pablo Arrabal ; Butterworth, Josh. / The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs. In: Monthly Notices of the Royal Astronomical Society. 2020 ; Vol. 493, No. 1. pp. 141-160.

Bibtex

@article{7edbaf55e55949dbbbb7a805def0314f,
title = "The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs",
abstract = " We explore deep rest-frame UV to FIR data in the COSMOS field to measure the individual spectral energy distributions (SED) of the ~4000 SC4K (Sobral et al. 2018) Lyman-alpha (Lya) emitters (LAEs) at z~2-6. We find typical stellar masses of 10$^{9.3\pm0.6}$ M$_{\odot}$ and star formation rates (SFR) of SFR$_{SED}=4.5^{+8.8}_{-2.5}$ M$_{\odot}$/yr and SFR$_{Lya}=5.9^{+6.3}_{-2.6}$ M$_{\odot}$/yr, combined with very blue UV slopes of beta=-2.0$^{+0.3}_{-0.5}$, but with significant variations within the population. M$_{UV}$ and beta are correlated in a similar way to UV-selected sources, but LAEs are consistently bluer. This suggests that LAEs are the youngest and/or most dust-poor subset of the UV-selected population. We also study the Lya rest-frame equivalent width (EW$_0$) and find 45 {"}extreme{"} LAEs with EW$_0>240$ A (3 $\sigma$), implying a low number density of $(7\pm1)\times10^{-7}$ Mpc$^{-3}$. Overall, we measure little to no evolution of the Lya EW$_0$ and scale length parameter ($w_0$) which are consistently high (EW$_0=140^{+280}_{-70}$ A, $w_0=129^{+11}_{-11}$ A) from z~6 to z~2 and below. However, $w_0$ is anti-correlated with M$_{UV}$ and stellar mass. Our results imply that sources selected as LAEs have a high Lya escape fraction (f$_{esc, Lya}$) irrespective of cosmic time, but f$_{esc, Lya}$ is still higher for UV-fainter and lower mass LAEs. The least massive LAEs ($",
keywords = "astro-ph.GA",
author = "S{\'e}rgio Santos and David Sobral and Jorryt Matthee and Jo{\~a}o Calhau and Cunha, {Elisabete da} and Bruno Ribeiro and Ana Paulino-Afonso and Haro, {Pablo Arrabal} and Josh Butterworth",
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 S Santos, D Sobral, J Matthee, J Calhau, E da Cunha, B Ribeiro, A Paulino-Afonso, P Arrabal Haro, J Butterworth, The evolution of rest-frame UV properties, Ly α EWs, and the SFR–stellar mass relation at z ∼ 2–6 for SC4K LAEs, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, March 2020, Pages 141–160, https://doi.org/10.1093/mnras/staa093 is available online at: https://academic.oup.com/mnras/article/493/1/141/5704403",
year = "2020",
month = mar
day = "1",
doi = "10.1093/mnras/staa093",
language = "English",
volume = "493",
pages = "141--160",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "1",

}

RIS

TY - JOUR

T1 - The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs

AU - Santos, Sérgio

AU - Sobral, David

AU - Matthee, Jorryt

AU - Calhau, João

AU - Cunha, Elisabete da

AU - Ribeiro, Bruno

AU - Paulino-Afonso, Ana

AU - Haro, Pablo Arrabal

AU - Butterworth, Josh

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 S Santos, D Sobral, J Matthee, J Calhau, E da Cunha, B Ribeiro, A Paulino-Afonso, P Arrabal Haro, J Butterworth, The evolution of rest-frame UV properties, Ly α EWs, and the SFR–stellar mass relation at z ∼ 2–6 for SC4K LAEs, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, March 2020, Pages 141–160, https://doi.org/10.1093/mnras/staa093 is available online at: https://academic.oup.com/mnras/article/493/1/141/5704403

PY - 2020/3/1

Y1 - 2020/3/1

N2 - We explore deep rest-frame UV to FIR data in the COSMOS field to measure the individual spectral energy distributions (SED) of the ~4000 SC4K (Sobral et al. 2018) Lyman-alpha (Lya) emitters (LAEs) at z~2-6. We find typical stellar masses of 10$^{9.3\pm0.6}$ M$_{\odot}$ and star formation rates (SFR) of SFR$_{SED}=4.5^{+8.8}_{-2.5}$ M$_{\odot}$/yr and SFR$_{Lya}=5.9^{+6.3}_{-2.6}$ M$_{\odot}$/yr, combined with very blue UV slopes of beta=-2.0$^{+0.3}_{-0.5}$, but with significant variations within the population. M$_{UV}$ and beta are correlated in a similar way to UV-selected sources, but LAEs are consistently bluer. This suggests that LAEs are the youngest and/or most dust-poor subset of the UV-selected population. We also study the Lya rest-frame equivalent width (EW$_0$) and find 45 "extreme" LAEs with EW$_0>240$ A (3 $\sigma$), implying a low number density of $(7\pm1)\times10^{-7}$ Mpc$^{-3}$. Overall, we measure little to no evolution of the Lya EW$_0$ and scale length parameter ($w_0$) which are consistently high (EW$_0=140^{+280}_{-70}$ A, $w_0=129^{+11}_{-11}$ A) from z~6 to z~2 and below. However, $w_0$ is anti-correlated with M$_{UV}$ and stellar mass. Our results imply that sources selected as LAEs have a high Lya escape fraction (f$_{esc, Lya}$) irrespective of cosmic time, but f$_{esc, Lya}$ is still higher for UV-fainter and lower mass LAEs. The least massive LAEs ($

AB - We explore deep rest-frame UV to FIR data in the COSMOS field to measure the individual spectral energy distributions (SED) of the ~4000 SC4K (Sobral et al. 2018) Lyman-alpha (Lya) emitters (LAEs) at z~2-6. We find typical stellar masses of 10$^{9.3\pm0.6}$ M$_{\odot}$ and star formation rates (SFR) of SFR$_{SED}=4.5^{+8.8}_{-2.5}$ M$_{\odot}$/yr and SFR$_{Lya}=5.9^{+6.3}_{-2.6}$ M$_{\odot}$/yr, combined with very blue UV slopes of beta=-2.0$^{+0.3}_{-0.5}$, but with significant variations within the population. M$_{UV}$ and beta are correlated in a similar way to UV-selected sources, but LAEs are consistently bluer. This suggests that LAEs are the youngest and/or most dust-poor subset of the UV-selected population. We also study the Lya rest-frame equivalent width (EW$_0$) and find 45 "extreme" LAEs with EW$_0>240$ A (3 $\sigma$), implying a low number density of $(7\pm1)\times10^{-7}$ Mpc$^{-3}$. Overall, we measure little to no evolution of the Lya EW$_0$ and scale length parameter ($w_0$) which are consistently high (EW$_0=140^{+280}_{-70}$ A, $w_0=129^{+11}_{-11}$ A) from z~6 to z~2 and below. However, $w_0$ is anti-correlated with M$_{UV}$ and stellar mass. Our results imply that sources selected as LAEs have a high Lya escape fraction (f$_{esc, Lya}$) irrespective of cosmic time, but f$_{esc, Lya}$ is still higher for UV-fainter and lower mass LAEs. The least massive LAEs ($

KW - astro-ph.GA

U2 - 10.1093/mnras/staa093

DO - 10.1093/mnras/staa093

M3 - Journal article

VL - 493

SP - 141

EP - 160

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -