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MIDIS : JWST NIRCam and MIRI Unveil the Stellar Population Properties of Lyα Emitters and Lyman-break Galaxies at z ≃ 3–7

Iani, Edoardo (author)
Caputi, Karina I. (author)
Rinaldi, Pierluigi (author)
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Annunziatella, Marianna (author)
Boogaard, Leindert A. (author)
Östlin, Göran, 1968- (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
Costantin, Luca (author)
Gillman, Steven (author)
Pérez-González, Pablo G. (author)
Colina, Luis (author)
Greve, Thomas R. (author)
Wright, Gillian (author)
Alonso-Herrero, Almudena (author)
Álvarez-Márquez, Javier (author)
Bik, Arjan, 1976- (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
Bosman, Sarah E. I. (author)
Gómez, Alejandro Crespo (author)
Eckart, Andreas (author)
Hjorth, Jens (author)
Jermann, Iris (author)
Labiano, Alvaro (author)
Langeroodi, Danial (author)
Melinder, Jens, 1977- (author)
Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
Moutard, Thibaud (author)
Peißker, Florian (author)
Pye, John P. (author)
Tikkanen, Tuomo V. (author)
van der Werf, Paul P. (author)
Walter, Fabian (author)
Henning, Thomas K. (author)
Lagage, Pierre-Olivier (author)
van Dishoeck, Ewine F. (author)
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 (creator_code:org_t)
2024
2024
English.
In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 963:2
Related links:
https://doi.org/10.3...
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https://urn.kb.se/re...
https://doi.org/10.3...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We study the stellar population properties of 182 spectroscopically confirmed (MUSE/VLT) Lyα emitters (LAEs) and 450 photometrically selected Lyman-break galaxies (LBGs) at z = 2.8–6.7 in the Hubble Extreme Deep Field. Leveraging the combined power of Hubble Space Telescope and JWST NIRCam and MIRI observations, we analyze their rest-frame UV-through-near-IR spectral energy distributions, with MIRI playing a crucial role in robustly assessing the LAEs' stellar masses and ages. Our LAEs are low-mass objects (log10(M⋆/M⊙)≃7.5) with little or no dust extinction (E(B − V) ≃ 0.1) and a blue UV continuum slope (β ≃ −2.2). While 75% of our LAEs are young (<100 Myr), the remaining 25% have significantly older stellar populations (≥100 Myr). These old LAEs are statistically more massive, less extinct, and have lower specific star formation rate than young LAEs. Besides, they populate the plane of M⋆ versus star formation rate along the main sequence of star-forming galaxies, while young LAEs populate the starburst region. The comparison between the LAEs' properties and those of a stellar-mass-matched sample of LBGs shows no statistical difference between these objects, except for the LBGs' redder UV continuum slope and marginally larger E(B − V) values. Interestingly, 48% of the LBGs have ages <10 Myr and are classified as starbursts, but lack detectable Lyα emission. This is likely due to H i resonant scattering and/or dust-selective extinction. Overall, we find that JWST observations are crucial in determining the properties of LAEs and shedding light on their comparison with LBGs.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

Lyman-alpha galaxies
Lyman-break galaxies
Galaxy evolution
Infrared telescopes

Publication and Content Type

ref (subject category)
art (subject category)

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