| Téléchargement | - Voir la version finale : CANUCS: UV and ionizing properties of dwarf star-forming galaxies at z ~ 5–7 (PDF, 1.9 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1093/mnras/stae1574 |
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| Auteur | Rechercher : Harshan, AnishyaIdentifiant ORCID : https://orcid.org/0000-0001-9414-6382; Rechercher : Bradač, MarušaIdentifiant ORCID : https://orcid.org/0000-0001-5984-0395; Rechercher : Abraham, RobertoIdentifiant ORCID : https://orcid.org/0000-0002-4542-921X; Rechercher : Asada, YoshihisaIdentifiant ORCID : https://orcid.org/0000-0003-3983-5438; Rechercher : Brammer, GabrielIdentifiant ORCID : https://orcid.org/0000-0003-2680-005X; Rechercher : Desprez, GuillaumeIdentifiant ORCID : https://orcid.org/0000-0001-8325-1742; Rechercher : Iyer, KarthiekIdentifiant ORCID : https://orcid.org/0000-0001-9298-3523; Rechercher : Martis, Nicholas S1Identifiant ORCID : https://orcid.org/0000-0003-3243-9969; Rechercher : Matharu, JasleenIdentifiant ORCID : https://orcid.org/0000-0002-7547-3385; Rechercher : Mowla, LamiyaIdentifiant ORCID : https://orcid.org/0000-0002-8530-9765; Rechercher : Muzzin, Adam; Rechercher : Noirot, Gaël; Rechercher : Rihtaršič, GregorIdentifiant ORCID : https://orcid.org/0009-0009-4388-898X; Rechercher : Sarrouh, Ghassan T EIdentifiant ORCID : https://orcid.org/0000-0001-8830-2166; Rechercher : Sawicki, MarcinIdentifiant ORCID : https://orcid.org/0000-0002-7712-7857; Rechercher : Strait, VictoriaIdentifiant ORCID : https://orcid.org/0000-0002-6338-7295; Rechercher : Willott, Chris J1Identifiant ORCID : https://orcid.org/0000-0002-4201-7367 |
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| Affiliation | - Conseil national de recherches Canada. Herzberg en astronomie et en astrophysique
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| Bailleur de fonds | Rechercher : European Research Council; Rechercher : Space Telescope Science Institute; Rechercher : National Aeronautics and Space Administration; Rechercher : Canadian Space Agency; Rechercher : Natural Sciences and Engineering Research Council of Canada; Rechercher : Danish National Research Foundation |
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| Format | Texte, Article |
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| Sujet | galaxies: evolution; galaxies: high-redshift; dark ages; reionization; first stars |
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| Résumé | The epoch of reionization (EoR) progressed through the emission of ionizing photons from galaxies to their local intergalactic medium. In this work, we characterize the dwarf star–forming galaxies as candidates for the source of ionizing photons that drove EoR. We investigate the ionizing properties and star formation histories of star-forming dwarf galaxies at the last stages of EoR at 4.8 < z < 7 using observations from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). The magnification due to gravitational lensing allows us to probe large dynamic ranges in stellar mass (2 × 10⁶ ≤ M∗/M⊙ ≤ 5 × 10⁹) and ultraviolet (UV) magnitudes (−22.68 ≤ MUV ≤ −15.95). We find a median UV slope β₁₅₀₀ of −2.56 ± 0.23 and the production efficiency of ionizing photons log ξ₁₀ₙ = 25.39 ± 0.6 for the full sample (4.8 < z < 7) with a median stellar mass of 6.3 ± 0.5 × 10⁷ M⊙. We find both β₁₅₀₀ and ξ₁₀ₙ are marginally correlated with the stellar mass of the galaxy, indicating a possible greater contribution of dwarf galaxies to the reionization of the Universe. We find that on average, galaxies in our sample are experiencing a recent rise/burst of star formation which translates to a higher scatter in ξ₁₀ₙ and a large scatter in Hα equivalent widths (EWs). Finally, we investigate the trends of Hα and [OIII] + Hβ EWs with UV magnitude and find MUV is correlated between Hα but not with [OIII] + Hβ EWs indicating low metallicities and recent burst in the UV faint galaxies. |
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| Date de publication | 2024-06-25 |
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| Maison d’édition | Oxford University Press |
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| Licence | |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | eae75d5d-2032-4068-9e3c-bec5eb6c37c7 |
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| Enregistrement créé | 2024-09-09 |
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| Enregistrement modifié | 2024-09-09 |
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