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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 David Sobral, Jorryt Matthee, Philip Best, Andra Stroe, Huub Röttgering, Iván Oteo, Ian Smail, Leah Morabito, Ana Paulino-Afonso; The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. Mon Not R Astron Soc 2017; 466 (1): 1242-1258. doi: 10.1093/mnras/stw3090 is available online at: https://academic.oup.com/mnras/article/466/1/1242/2617718/

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The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23

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The CALYMHA survey : Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. / Sobral, David; Matthee, Jorryt; Best, Philip N.; Stroe, Andra; Röttgering, Huub J A; Oteo, Ivàn; Smail, Ian; Morabito, Leah; Paulino-Afonso, Ana.

In: Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 1, 04.2017, p. 1242-1258.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Sobral, D, Matthee, J, Best, PN, Stroe, A, Röttgering, HJA, Oteo, I, Smail, I, Morabito, L & Paulino-Afonso, A 2017, 'The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23', Monthly Notices of the Royal Astronomical Society, vol. 466, no. 1, pp. 1242-1258. https://doi.org/10.1093/mnras/stw3090

APA

Sobral, D., Matthee, J., Best, P. N., Stroe, A., Röttgering, H. J. A., Oteo, I., Smail, I., Morabito, L., & Paulino-Afonso, A. (2017). The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. Monthly Notices of the Royal Astronomical Society, 466(1), 1242-1258. https://doi.org/10.1093/mnras/stw3090

Vancouver

Sobral D, Matthee J, Best PN, Stroe A, Röttgering HJA, Oteo I et al. The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. Monthly Notices of the Royal Astronomical Society. 2017 Apr;466(1):1242-1258. https://doi.org/10.1093/mnras/stw3090

Author

Sobral, David ; Matthee, Jorryt ; Best, Philip N. ; Stroe, Andra ; Röttgering, Huub J A ; Oteo, Ivàn ; Smail, Ian ; Morabito, Leah ; Paulino-Afonso, Ana. / The CALYMHA survey : Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 466, No. 1. pp. 1242-1258.

Bibtex

@article{6237cdac081b4134aa2dc4e2889f9a8c,
title = "The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23",
abstract = "We present the CAlibrating LYMan-α with Hα (CALYMHA) pilot survey and new results on Lyman α (Lyα) selected galaxies at z ∼ 2. We use a custom-built Lyα narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z = 2.23 Hα HiZELS survey. Here, we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3σ line flux limit of ∼4 × 10−17 erg s−1 cm−2, and a Lyα luminosity limit of ∼1042.3 erg s−1. We find 188 Lyα emitters over 7.3 × 105 Mpc3, but also find significant numbers of other line-emitting sources corresponding to He ii, C iii] and C iv emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Lyα luminosity function at z = 2.23 is very well described by a Schechter function up to LLy α ≈ 1043 erg s−1 with L∗=1042.59+0.16−0.08L∗=1042.59−0.08+0.16 erg s−1, ϕ∗=10−3.09+0.14−0.34ϕ∗=10−3.09−0.34+0.14 Mpc−3 and α = −1.75 ± 0.25. Above LLy α ≈ 1043 erg s−1, the Lyα luminosity function becomes power-law like, driven by X-ray AGN. We find that Lyα-selected emitters have a high escape fraction of 37 ± 7 per cent, anticorrelated with Lyα luminosity and correlated with Lyα equivalent width. Lyα emitters have ubiquitous large (≈40 kpc) Lyα haloes, ∼2 times larger than their Hα extents. By directly comparing our Lyα and Hα luminosity functions, we find that the global/overall escape fraction of Lyα photons (within a 13 kpc radius) from the full population of star-forming galaxies is 5.1 ± 0.2 per cent at the peak of the star formation history. An extra 3.3 ± 0.3 per cent of Lyα photons likely still escape, but at larger radii.",
keywords = "galaxies: evolution, galaxies: haloes, galaxies: high-redshift, galaxies: luminosity function, mass function, galaxies: statistics, cosmology: observations",
author = "David Sobral and Jorryt Matthee and Best, {Philip N.} and Andra Stroe and R{\"o}ttgering, {Huub J A} and Iv{\`a}n Oteo and Ian Smail and Leah Morabito and Ana Paulino-Afonso",
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 David Sobral, Jorryt Matthee, Philip Best, Andra Stroe, Huub R{\"o}ttgering, Iv{\'a}n Oteo, Ian Smail, Leah Morabito, Ana Paulino-Afonso; The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. Mon Not R Astron Soc 2017; 466 (1): 1242-1258. doi: 10.1093/mnras/stw3090 is available online at: https://academic.oup.com/mnras/article/466/1/1242/2617718/",
year = "2017",
month = apr,
doi = "10.1093/mnras/stw3090",
language = "English",
volume = "466",
pages = "1242--1258",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "1",

}

RIS

TY - JOUR

T1 - The CALYMHA survey

T2 - Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23

AU - Sobral, David

AU - Matthee, Jorryt

AU - Best, Philip N.

AU - Stroe, Andra

AU - Röttgering, Huub J A

AU - Oteo, Ivàn

AU - Smail, Ian

AU - Morabito, Leah

AU - Paulino-Afonso, Ana

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 David Sobral, Jorryt Matthee, Philip Best, Andra Stroe, Huub Röttgering, Iván Oteo, Ian Smail, Leah Morabito, Ana Paulino-Afonso; The CALYMHA survey: Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23. Mon Not R Astron Soc 2017; 466 (1): 1242-1258. doi: 10.1093/mnras/stw3090 is available online at: https://academic.oup.com/mnras/article/466/1/1242/2617718/

PY - 2017/4

Y1 - 2017/4

N2 - We present the CAlibrating LYMan-α with Hα (CALYMHA) pilot survey and new results on Lyman α (Lyα) selected galaxies at z ∼ 2. We use a custom-built Lyα narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z = 2.23 Hα HiZELS survey. Here, we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3σ line flux limit of ∼4 × 10−17 erg s−1 cm−2, and a Lyα luminosity limit of ∼1042.3 erg s−1. We find 188 Lyα emitters over 7.3 × 105 Mpc3, but also find significant numbers of other line-emitting sources corresponding to He ii, C iii] and C iv emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Lyα luminosity function at z = 2.23 is very well described by a Schechter function up to LLy α ≈ 1043 erg s−1 with L∗=1042.59+0.16−0.08L∗=1042.59−0.08+0.16 erg s−1, ϕ∗=10−3.09+0.14−0.34ϕ∗=10−3.09−0.34+0.14 Mpc−3 and α = −1.75 ± 0.25. Above LLy α ≈ 1043 erg s−1, the Lyα luminosity function becomes power-law like, driven by X-ray AGN. We find that Lyα-selected emitters have a high escape fraction of 37 ± 7 per cent, anticorrelated with Lyα luminosity and correlated with Lyα equivalent width. Lyα emitters have ubiquitous large (≈40 kpc) Lyα haloes, ∼2 times larger than their Hα extents. By directly comparing our Lyα and Hα luminosity functions, we find that the global/overall escape fraction of Lyα photons (within a 13 kpc radius) from the full population of star-forming galaxies is 5.1 ± 0.2 per cent at the peak of the star formation history. An extra 3.3 ± 0.3 per cent of Lyα photons likely still escape, but at larger radii.

AB - We present the CAlibrating LYMan-α with Hα (CALYMHA) pilot survey and new results on Lyman α (Lyα) selected galaxies at z ∼ 2. We use a custom-built Lyα narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z = 2.23 Hα HiZELS survey. Here, we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3σ line flux limit of ∼4 × 10−17 erg s−1 cm−2, and a Lyα luminosity limit of ∼1042.3 erg s−1. We find 188 Lyα emitters over 7.3 × 105 Mpc3, but also find significant numbers of other line-emitting sources corresponding to He ii, C iii] and C iv emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Lyα luminosity function at z = 2.23 is very well described by a Schechter function up to LLy α ≈ 1043 erg s−1 with L∗=1042.59+0.16−0.08L∗=1042.59−0.08+0.16 erg s−1, ϕ∗=10−3.09+0.14−0.34ϕ∗=10−3.09−0.34+0.14 Mpc−3 and α = −1.75 ± 0.25. Above LLy α ≈ 1043 erg s−1, the Lyα luminosity function becomes power-law like, driven by X-ray AGN. We find that Lyα-selected emitters have a high escape fraction of 37 ± 7 per cent, anticorrelated with Lyα luminosity and correlated with Lyα equivalent width. Lyα emitters have ubiquitous large (≈40 kpc) Lyα haloes, ∼2 times larger than their Hα extents. By directly comparing our Lyα and Hα luminosity functions, we find that the global/overall escape fraction of Lyα photons (within a 13 kpc radius) from the full population of star-forming galaxies is 5.1 ± 0.2 per cent at the peak of the star formation history. An extra 3.3 ± 0.3 per cent of Lyα photons likely still escape, but at larger radii.

KW - galaxies: evolution

KW - galaxies: haloes

KW - galaxies: high-redshift

KW - galaxies: luminosity function

KW - mass function

KW - galaxies: statistics

KW - cosmology: observations

U2 - 10.1093/mnras/stw3090

DO - 10.1093/mnras/stw3090

M3 - Journal article

VL - 466

SP - 1242

EP - 1258

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -