| Download | - View final version: CANUCS: UV and ionizing properties of dwarf star-forming galaxies at z ~ 5–7 (PDF, 1.9 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1093/mnras/stae1574 |
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| Author | Search for: Harshan, AnishyaORCID identifier: https://orcid.org/0000-0001-9414-6382; Search for: Bradač, MarušaORCID identifier: https://orcid.org/0000-0001-5984-0395; Search for: Abraham, RobertoORCID identifier: https://orcid.org/0000-0002-4542-921X; Search for: Asada, YoshihisaORCID identifier: https://orcid.org/0000-0003-3983-5438; Search for: Brammer, GabrielORCID identifier: https://orcid.org/0000-0003-2680-005X; Search for: Desprez, GuillaumeORCID identifier: https://orcid.org/0000-0001-8325-1742; Search for: Iyer, KarthiekORCID identifier: https://orcid.org/0000-0001-9298-3523; Search for: Martis, Nicholas S1ORCID identifier: https://orcid.org/0000-0003-3243-9969; Search for: Matharu, JasleenORCID identifier: https://orcid.org/0000-0002-7547-3385; Search for: Mowla, LamiyaORCID identifier: https://orcid.org/0000-0002-8530-9765; Search for: Muzzin, Adam; Search for: Noirot, Gaël; Search for: Rihtaršič, GregorORCID identifier: https://orcid.org/0009-0009-4388-898X; Search for: Sarrouh, Ghassan T EORCID identifier: https://orcid.org/0000-0001-8830-2166; Search for: Sawicki, MarcinORCID identifier: https://orcid.org/0000-0002-7712-7857; Search for: Strait, VictoriaORCID identifier: https://orcid.org/0000-0002-6338-7295; Search for: Willott, Chris J1ORCID identifier: https://orcid.org/0000-0002-4201-7367 |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Funder | Search for: European Research Council; Search for: Space Telescope Science Institute; Search for: National Aeronautics and Space Administration; Search for: Canadian Space Agency; Search for: Natural Sciences and Engineering Research Council of Canada; Search for: Danish National Research Foundation |
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| Format | Text, Article |
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| Subject | galaxies: evolution; galaxies: high-redshift; dark ages; reionization; first stars |
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| Abstract | 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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| Publication date | 2024-06-25 |
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| Publisher | Oxford University Press |
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| Licence | |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | eae75d5d-2032-4068-9e3c-bec5eb6c37c7 |
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| Record created | 2024-09-09 |
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| Record modified | 2024-09-09 |
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