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  • Iani, Edoardo (author)

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

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • 2024
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-228038
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-228038URI
  • https://doi.org/10.3847/1538-4357/ad15f6DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Caputi, Karina I. (author)
  • Rinaldi, Pierluigi (author)
  • Annunziatella, Marianna (author)
  • Boogaard, Leindert A. (author)
  • Östlin, Göran,1968-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ostlin (author)
  • 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-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)abik (author)
  • 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-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)jeand (author)
  • 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)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Astrophysical Journal963:20004-637X1538-4357

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