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Emission-line properties of IllustrisTNG galaxies: from local diagnostic diagrams to high-redshift predictions for JWST

We compute synthetic, rest-frame optical and ultraviolet (UV) emission-line properties of galaxy populations at redshifts from z ≈ 0 to  = 8 in a full cosmological framework. We achieve this by coupling, in post-processing, the cosmological IllustrisTNG simulations with new-generation nebular-emissi...

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Hauptverfasser: Hirschmann, Michaela (VerfasserIn) , Charlot, Stephane (VerfasserIn) , Feltre, Anna (VerfasserIn) , Curtis-Lake, Emma (VerfasserIn) , Somerville, Rachel S (VerfasserIn) , Chevallard, Jacopo (VerfasserIn) , Choi, Ena (VerfasserIn) , Nelson, Dylan (VerfasserIn) , Morisset, Christophe (VerfasserIn) , Plat, Adele (VerfasserIn) , Vidal-Garcia, Alba (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: Dezember 2023
In: Monthly notices of the Royal Astronomical Society
Year: 2023, Jahrgang: 526, Heft: 3, Pages: 3610-3636
ISSN:1365-2966
DOI:10.1093/mnras/stad2955
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1093/mnras/stad2955
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Verfasserangaben:Michaela Hirschmann, Stephane Charlot, Anna Feltre, Emma Curtis-Lake, Rachel S. Somerville, Jacopo Chevallard, Ena Choi, Dylan Nelson, Christophe Morisset, Adele Plat and Alba Vidal-Garcia
Beschreibung
Zusammenfassung:We compute synthetic, rest-frame optical and ultraviolet (UV) emission-line properties of galaxy populations at redshifts from z ≈ 0 to  = 8 in a full cosmological framework. We achieve this by coupling, in post-processing, the cosmological IllustrisTNG simulations with new-generation nebular-emission models, accounting for line emission from young stars, post-asymptotic giant branch (PAGB) stars, accreting black holes (BHs) and, for the first time, fast radiative shocks. The optical emission-line properties of simulated galaxies dominated by different ionizing sources in our models are largely consistent with those expected from classical diagnostic diagrams and reflect the observed increase in [O iii]/Hβ at fixed [N ii]/Hα and the evolution of the Hα, [O iii]λ5007, and [O ii] λ3727 luminosity functions from z ≈ 0 to ∼ 2. At higher redshift, we find that the emission-line galaxy population is dominated by star-forming and active galaxies, with negligible fractions of shock- and PAGB-dominated galaxies. We highlight 10 UV-diagnostic diagrams able to robustly identify the dominant ionizing sources in high-redshift galaxies. We also compute the evolution of several optical- and UV-line-luminosity functions from z = 4 to 7, and the number of galaxies expected to be detectable per field of view in deep, medium-resolution spectroscopic observations with the NIRSpec instrument on board the JWST. We find that 2-h-long exposures are sufficient to achieve unbiased censuses of Hα and [O iii]λ5007 emitters, while at least 5 h are required for Hβ, and even 10 h will detect only progressively smaller fractions of [O ii] λ3727, O iii] λ1663, C iii] λ1908, C iv λ1550, [N ii]λ6584, Si iii] λ1888, and He ii λ1640 emitters, especially in the presence of dust.
Beschreibung:Online veröffentlicht am 9. Oktober 2023
Gesehen am 23.04.2024
Beschreibung:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stad2955

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