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MUSE observations towards the lensing cluster A2744: Intersection between the LBG and LAE populations at z ∼ 3–7

We present a study of the intersection between the populations of star forming galaxies selected as either Lyman break galaxies (LBGs) or Lyman-alpha emitters (LAEs) in the redshift range 2.9 − 6.7 and within the same volume of universe sampled by the Multi-Unit Spectroscopic Explorer (MUSE) behind...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2020-12, Vol.644, p.A39
Main Authors: de La Vieuville, G., Pelló, R., Richard, J., Mahler, G., Lévêque, L., Bauer, F. E., Lagattuta, D. J., Blaizot, J., Contini, T., Guaita, L., Kusakabe, H., Laporte, N., Martinez, J., Maseda, M. V., Schaerer, D., Schmidt, K. B., Verhamme, A.
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Language:English
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Summary:We present a study of the intersection between the populations of star forming galaxies selected as either Lyman break galaxies (LBGs) or Lyman-alpha emitters (LAEs) in the redshift range 2.9 − 6.7 and within the same volume of universe sampled by the Multi-Unit Spectroscopic Explorer (MUSE) behind the Hubble Frontier Fields lensing cluster A2744. We define three samples of star-forming galaxies: LBG galaxies with an LAE counterpart (92 galaxies), LBG galaxies without an LAE counterpart (408 galaxies), and LAE galaxies without an LBG counterpart (46 galaxies). All these galaxies are intrinsically faint because of the lensing nature of the sample ( M 1500  ≥ −20.5). The fraction of LAEs among all selected star-forming galaxies increases with redshift up to z  ∼ 6 and decreases for higher redshifts, in agreement with previous findings. The evolution of LAE/LBG populations with UV magnitude and Ly α luminosity shows that the LAE selection is able to identify intrinsically UV faint galaxies with M 1500  ≥ −15 that are typically missed in the deepest lensing photometric surveys. The LBG population seems to fairly represent the total population of star-forming galaxies down to M 1500  ∼ −15. Galaxies with M 1500  
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/202037651