FirstLight IV: diversity in sub-L* galaxies at cosmic dawn
Using a large sample of sub-L* galaxies, with similar UV magnitudes, MUV ≃ −19 at z ≃ 6, extracted from the FirstLight simulations, we show the diversity of galaxies at the end of the reionization epoch. We find a factor ∼40 variation in the specific star formation rate (sSFR). This drives a ∼1 dex...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
28 April 2021
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2021, Jahrgang: 504, Heft: 3, Pages: 4472-4480 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stab1206 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab1206
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| Verfasserangaben: | Daniel Ceverino, Michaela Hirschmann, Ralf S. Klessen, Simon C.O. Glover, Stéphane Charlot and Anna Feltre |
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| 520 | |a Using a large sample of sub-L* galaxies, with similar UV magnitudes, MUV ≃ −19 at z ≃ 6, extracted from the FirstLight simulations, we show the diversity of galaxies at the end of the reionization epoch. We find a factor ∼40 variation in the specific star formation rate (sSFR). This drives a ∼1 dex range in equivalent width of the [O iii]λ5007 line. Variations in nebular metallicity and ionization parameter within H ii regions lead to a scatter in the equivalent widths and [O iii]/H α line ratio at a fixed sSFR. [O iii]-bright ([O iii]/H α>1) emitters have higher ionization parameters and/or higher metallicities than H α-bright ([O iii]/H α<1) galaxies. According to the surface brightness maps in both [O iii] and H α, [O iii]-bright emitters are more compact than H α-bright galaxies. H α luminosity is higher than [O iii] if star formation is distributed over extended regions. [O iii] dominates if it is concentrated in compact clumps. In both cases, the H α-emitting gas is significantly more extended than [O iii]. | ||
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