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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, Iván Oteo, Philip Best, Ian Smail, Huub Röttgering, Ana Paulino-Afonso; The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23. Mon Not R Astron Soc 2016; 458 (1): 449-467. doi: 10.1093/mnras/stw322 is available online at: https://academic.oup.com/mnras/article/458/1/449/2622889/

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The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23

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The CALYMHA survey : Lyα escape fraction and its dependence on galaxy properties at z = 2.23 . / Matthee, Jorryt; Sobral, David; Best, Philip; Stroe, Andra; Röttgering, Huub; Oteo, Iván; Smail, Ian; Morabito, Leah; Paulino-Afonso, Ana.

In: Monthly Notices of the Royal Astronomical Society, Vol. 458, No. 1, 01.05.2016, p. 449-467.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Matthee, J, Sobral, D, Best, P, Stroe, A, Röttgering, H, Oteo, I, Smail, I, Morabito, L & Paulino-Afonso, A 2016, 'The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23 ', Monthly Notices of the Royal Astronomical Society, vol. 458, no. 1, pp. 449-467.

APA

Matthee, J., Sobral, D., Best, P., Stroe, A., Röttgering, H., Oteo, I., Smail, I., Morabito, L., & Paulino-Afonso, A. (2016). The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23 . Monthly Notices of the Royal Astronomical Society, 458(1), 449-467.

Vancouver

Matthee J, Sobral D, Best P, Stroe A, Röttgering H, Oteo I et al. The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23 . Monthly Notices of the Royal Astronomical Society. 2016 May 1;458(1):449-467.

Author

Matthee, Jorryt ; Sobral, David ; Best, Philip ; Stroe, Andra ; Röttgering, Huub ; Oteo, Iván ; Smail, Ian ; Morabito, Leah ; Paulino-Afonso, Ana. / The CALYMHA survey : Lyα escape fraction and its dependence on galaxy properties at z = 2.23 . In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 458, No. 1. pp. 449-467.

Bibtex

@article{8d6a20d897a2426bb2d8aab5993e425c,
title = "The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23 ",
abstract = "We present the CAlibrating LYMan-$\alpha$ with H$\alpha$ (CALYMHA) pilot survey and new results on Lyman-$\alpha$ (Lya) selected galaxies at z~2. We use a custom-built Lya narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z=2.23 Ha HiZELS survey. Here we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3$\sigma$ line flux limit of ~4x10$^{-17}$ erg/s/cm$^{2}$, and a Lya luminosity limit of ~10$^{42.3}$ erg/s. We find 188 Lya emitters over 7.3x10$^5$ Mpc$^{3}$, but also find significant numbers of other line emitting sources corresponding to HeII, CIII] and CIV emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Lya luminosity function at z=2.23 is very well described by a Schechter function up to L~10$^{43}$ erg/s with L$^*=10^{42.59+-0.05}$ erg/s, $\phi^*=10^{-3.09+-0.08}$ Mpc$^{-3}$ and $\alpha$=-1.75+-0.15. Above L~10$^{43}$ erg/s the Lya luminosity function becomes power-law like, driven by X-ray AGN. We find that Lya-selected emitters have a high escape fraction of 37+-7%, anti-correlated with Lya luminosity and correlated with Lya equivalent width. Lya emitters have ubiquitous large (~40 kpc) Lya haloes, 2x larger than their Ha extents. By directly comparing our Lya and Ha luminosity functions we find that the global/overall escape fraction of Lya photons (within a 13 kpc radius) from the full population of star-forming galaxies is 5.1+-0.2% at the peak of the star formation history. An extra 3.3+-0.3% of Lya photons likely still escape, but at larger radii.",
keywords = "astro-ph.GA, astro-ph.CO, Galaxies: high-redshift, luminosity function, mass function, evolution, quasars, emission lines, cosmology, observations",
author = "Jorryt Matthee and David Sobral and Philip Best and Andra Stroe and Huub R{\"o}ttgering 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 Jorryt Matthee, David Sobral, Iv{\'a}n Oteo, Philip Best, Ian Smail, Huub R{\"o}ttgering, Ana Paulino-Afonso; The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23. Mon Not R Astron Soc 2016; 458 (1): 449-467. doi: 10.1093/mnras/stw322 is available online at: https://academic.oup.com/mnras/article/458/1/449/2622889/ 19 pages, 11 figures. Accepted for publication in MNRAS.",
year = "2016",
month = may,
day = "1",
language = "English",
volume = "458",
pages = "449--467",
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 escape fraction and its dependence on galaxy properties at z = 2.23

AU - Matthee, Jorryt

AU - Sobral, David

AU - Best, Philip

AU - Stroe, Andra

AU - Röttgering, Huub

AU - Oteo, Iván

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 Jorryt Matthee, David Sobral, Iván Oteo, Philip Best, Ian Smail, Huub Röttgering, Ana Paulino-Afonso; The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23. Mon Not R Astron Soc 2016; 458 (1): 449-467. doi: 10.1093/mnras/stw322 is available online at: https://academic.oup.com/mnras/article/458/1/449/2622889/ 19 pages, 11 figures. Accepted for publication in MNRAS.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - We present the CAlibrating LYMan-$\alpha$ with H$\alpha$ (CALYMHA) pilot survey and new results on Lyman-$\alpha$ (Lya) selected galaxies at z~2. We use a custom-built Lya narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z=2.23 Ha HiZELS survey. Here we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3$\sigma$ line flux limit of ~4x10$^{-17}$ erg/s/cm$^{2}$, and a Lya luminosity limit of ~10$^{42.3}$ erg/s. We find 188 Lya emitters over 7.3x10$^5$ Mpc$^{3}$, but also find significant numbers of other line emitting sources corresponding to HeII, CIII] and CIV emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Lya luminosity function at z=2.23 is very well described by a Schechter function up to L~10$^{43}$ erg/s with L$^*=10^{42.59+-0.05}$ erg/s, $\phi^*=10^{-3.09+-0.08}$ Mpc$^{-3}$ and $\alpha$=-1.75+-0.15. Above L~10$^{43}$ erg/s the Lya luminosity function becomes power-law like, driven by X-ray AGN. We find that Lya-selected emitters have a high escape fraction of 37+-7%, anti-correlated with Lya luminosity and correlated with Lya equivalent width. Lya emitters have ubiquitous large (~40 kpc) Lya haloes, 2x larger than their Ha extents. By directly comparing our Lya and Ha luminosity functions we find that the global/overall escape fraction of Lya photons (within a 13 kpc radius) from the full population of star-forming galaxies is 5.1+-0.2% at the peak of the star formation history. An extra 3.3+-0.3% of Lya photons likely still escape, but at larger radii.

AB - We present the CAlibrating LYMan-$\alpha$ with H$\alpha$ (CALYMHA) pilot survey and new results on Lyman-$\alpha$ (Lya) selected galaxies at z~2. We use a custom-built Lya narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z=2.23 Ha HiZELS survey. Here we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3$\sigma$ line flux limit of ~4x10$^{-17}$ erg/s/cm$^{2}$, and a Lya luminosity limit of ~10$^{42.3}$ erg/s. We find 188 Lya emitters over 7.3x10$^5$ Mpc$^{3}$, but also find significant numbers of other line emitting sources corresponding to HeII, CIII] and CIV emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Lya luminosity function at z=2.23 is very well described by a Schechter function up to L~10$^{43}$ erg/s with L$^*=10^{42.59+-0.05}$ erg/s, $\phi^*=10^{-3.09+-0.08}$ Mpc$^{-3}$ and $\alpha$=-1.75+-0.15. Above L~10$^{43}$ erg/s the Lya luminosity function becomes power-law like, driven by X-ray AGN. We find that Lya-selected emitters have a high escape fraction of 37+-7%, anti-correlated with Lya luminosity and correlated with Lya equivalent width. Lya emitters have ubiquitous large (~40 kpc) Lya haloes, 2x larger than their Ha extents. By directly comparing our Lya and Ha luminosity functions we find that the global/overall escape fraction of Lya photons (within a 13 kpc radius) from the full population of star-forming galaxies is 5.1+-0.2% at the peak of the star formation history. An extra 3.3+-0.3% of Lya photons likely still escape, but at larger radii.

KW - astro-ph.GA

KW - astro-ph.CO

KW - Galaxies: high-redshift

KW - luminosity function, mass function

KW - evolution

KW - quasars

KW - emission lines

KW - cosmology

KW - observations

M3 - Journal article

VL - 458

SP - 449

EP - 467

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -