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The MUSE-Wide survey: a measurement of the Ly alpha emitting fraction among z > 3 galaxies

J. Caruana, L. Wisotzki, E. C. Herenz, J. Kerutt, T. Urrutia, K. B. Schmidt, R. J. Bouwens, J. Brinchmann, S. Cantalupo, C. M. Carollo, C. Diener, A. Drake, T. Garel, R. A. Marino, J. Richard, R. Saust, J. Schaye, A. Verhamme

Abstract
We present a measurement of the fraction of Lyman α (Ly α) emitters (XLy α) amongst HST continuum-selected galaxies at 3 < z < 6 with the Multi-Unit Spectroscopic Explorer (MUSE) on the VLT. Making use of the first 24 MUSE-Wide pointings in GOODS-South, each having an integration time of 1h, we detect 100 Ly α emitters and find XLy α ≳ 0.5 for most of the redshift range covered, with 29 per cent of the Lyα sample exhibiting rest equivalent widths (rest-EWs) ≤ 15Å. Adopting a range of rest-EW cuts (0-75Å), we find no evidence of a dependence of XLy α on either redshift or ultraviolet luminosity.

Keywords
galaxies: high-redshift, galaxies: star formation, galaxies: statistics

Monthly Notices of the Royal Astronomical Society
Volume 473, Issue 1, Page 30
2018 January

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia