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SHARDS frontier fields: physical properties of a low-mass Lyα emitter at z = 5.75

Hern�n-Caballero, Antonio; P�rez-Gonz�lez, Pablo G.; Diego, Jose M.; Lagattuta, David; Richard, Johan; Schaerer, Daniel; Alonso-Herrero, Almudena; Marino, Raffaella Anna; Sklias, Panos; Alcalde Pampliega, Bel�n; Cava, Antonio; Conselice, Christopher J.; Dannerbauer, Helmut; Dom�nguez-S�nchez, Helena; Eliche-Moral, Carmen; Esquej, Pilar; Huertas-Company, Marc; Marques-Chaves, Rui; Perez-Fournon, Ismael; Rawle, Tim; Espinosa, Jos� Miguel Rodr�guez; Gonz�lez, Daniel Rosa; Rujopakarn, Wiphu

SHARDS frontier fields: physical properties of a low-mass Lyα emitter at z = 5.75 Thumbnail


Authors

Antonio Hern�n-Caballero

Pablo G. P�rez-Gonz�lez

Jose M. Diego

David Lagattuta

Johan Richard

Daniel Schaerer

Almudena Alonso-Herrero

Raffaella Anna Marino

Panos Sklias

Bel�n Alcalde Pampliega

Antonio Cava

Christopher J. Conselice

Helmut Dannerbauer

Helena Dom�nguez-S�nchez

Carmen Eliche-Moral

Pilar Esquej

Marc Huertas-Company

Rui Marques-Chaves

Ismael Perez-Fournon

Tim Rawle

Jos� Miguel Rodr�guez Espinosa

Daniel Rosa Gonz�lez

Wiphu Rujopakarn



Abstract

© 2017. The American Astronomical Society. All rights reserved. We analyze the properties of a multiply imaged Lyα (Lyα) emitter at z = 5.75 identified through SHARDS Frontier Fields intermediate-band imaging of the Hubble Frontier Fields (HFF) cluster Abell 370. The source, A370-L57, has low intrinsic luminosity (M UV ∼ -16.5), steep UV spectral index (β = -2.4 ± 0.1), and extreme rest-frame equivalent width of Lyα. Two different gravitational lens models predict high magnification (μ ∼ 10-16) for the two detected counterimages, separated by 7″, while a predicted third counterimage (μ ∼ 3-4) is undetected. We find differences of ∼50% in magnification between the two lens models, quantifying our current systematic uncertainties. Integral field spectroscopy of A370-L57 with MUSE shows a narrow (FWHM = 204 ± 10 km s -1 ) and asymmetric Lyα profile with an integrated luminosity L(Lyα) ∼ 10 42 erg s -1 . The morphology in the Hubble Space Telescope bands comprises a compact clump (r e < 100 pc) that dominates the Lyα and continuum emission and several fainter clumps at projected distances ≲1 kpc that coincide with an extension of the Lyα emission in the SHARDS F823W17 and MUSE observations. The latter could be part of the same galaxy or an interacting companion. We find no evidence of a contribution from active galactic nuclei to the Lyα emission. Fitting of the spectral energy distribution with stellar population models favors a very young (t < 10 Myr), low-mass (), and metal-poor (Z ≲ 4 10 -3 ) stellar population. Its modest star formation rate (SFR ∼ 1.0 yr -1 ) implies high specific SFR (sSFR ∼ 2.5 10 -7 yr -1 ) and SFR density ( yr -1 kpc -2 ). The properties of A370-L57 make it a good representative of the population of galaxies responsible for cosmic reionization.

Citation

Hernán-Caballero, A., Pérez-González, P. G., Diego, J. M., Lagattuta, D., Richard, J., Schaerer, D., …Rujopakarn, W. (2017). SHARDS frontier fields: physical properties of a low-mass Lyα emitter at z = 5.75. Astrophysical Journal, 849(2), Article 82. https://doi.org/10.3847/1538-4357/aa917f

Journal Article Type Article
Acceptance Date Oct 2, 2017
Publication Date Nov 6, 2017
Deposit Date Dec 11, 2017
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 849
Issue 2
Article Number 82
DOI https://doi.org/10.3847/1538-4357/aa917f
Keywords Dark ages; Teionization; First stars; Early universe; Galaxies: evolution; Galaxies: high red-shift; Galaxies: starburst; Gravitational lensing; Strong
Public URL https://nottingham-repository.worktribe.com/output/892941
Publisher URL https://doi.org/10.3847/1538-4357/aa917f
Additional Information © Copyright 2017 IOP Publishing

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