A model for the emission-line galaxy luminosity function and flux ratios at high redshifts

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dc.contributor.authorPathak, Aadarshen
dc.contributor.authorWyithe, J. B.Stuarten
dc.contributor.authorSutherland, Ralph S.en
dc.contributor.authorKewley, L. J.en
dc.date.accessioned2025-12-16T01:34:18Z
dc.date.available2025-12-16T01:34:18Z
dc.date.issued2025en
dc.description.abstractWe present [O III]/Hβ emission-line flux ratio predictions for galaxies at z ∼ 7 − 9 using the MAPPINGS V v5.2.0 photoionization modelling code combined with an analytic galaxy formation model. Properties such as pressure and ionization parameter that determine emission-line properties are thought to evolve towards high redshift. In order to determine the range of expected interstellar conditions we extend previous modelling of the star formation rate density (SFRD) function to calculate the metallicity and ionization parameter, and incorporate the potential impact of turbulence on the density of the interstellar medium. To validate our emission-line predictions, we calculate the [O III] line luminosity and its dependence on UV luminosity, as well as the flux ratio [O III]/Hβ and its variation with the line luminosity, finding that both reproduce recent JWST observations from the FRESCO survey. We also use our model to predict the number counts of emission-line galaxies across a range of redshift as well as the dependence of [O III]/Hβ on ionization parameter and metallicity. Finally, we show that the dependence of flux ratio on luminosity may provide a diagnostic of turbulent motion in galactic discs.en
dc.description.sponsorshipThis research was supported by ARC Centre of Excellence for All Sky Astrophysics (ASTRO 3D), through project no. CE170100013. PA thanks for insightful discussions and David Nicholls for providing insightful information on mappings v v5.2.1. We thank Pascal Oesch for kindly sharing the FRESCO catalogue of [] emitters.en
dc.description.statusPeer-revieweden
dc.format.extent12en
dc.identifier.issn0035-8711en
dc.identifier.otherORCID:/0000-0001-7956-9758/work/194972864en
dc.identifier.scopus105002585017en
dc.identifier.urihttps://hdl.handle.net/1885/733795160
dc.language.isoenen
dc.rightsPublisher Copyright: © 2025 The Author(s).en
dc.sourceMonthly Notices of the Royal Astronomical Societyen
dc.subjectgalaxies: evolutionen
dc.subjectgalaxies: high-redshiften
dc.subjectgalaxies: ISMen
dc.subjectgalaxies: star formationen
dc.titleA model for the emission-line galaxy luminosity function and flux ratios at high redshiftsen
dc.typeJournal articleen
dspace.entity.typePublicationen
local.bibliographicCitation.lastpage632en
local.bibliographicCitation.startpage621en
local.contributor.affiliationPathak, Aadarsh; University of Melbourneen
local.contributor.affiliationWyithe, J. B.Stuart; RSAA Academic Program, Research School of Astronomy & Astrophysics, ANU College of Science and Medicine, The Australian National Universityen
local.contributor.affiliationSutherland, Ralph S.; RSAA Academic Program, Research School of Astronomy & Astrophysics, ANU College of Science and Medicine, The Australian National Universityen
local.contributor.affiliationKewley, L. J.; Center for Astrophysics–Harvard and Smithsonianen
local.identifier.citationvolume539en
local.identifier.doi10.1093/mnras/staf545en
local.identifier.pure4a4e5a04-8487-4fdf-8134-6684b6900bd5en
local.identifier.urlhttps://www.scopus.com/pages/publications/105002585017en
local.type.statusPublisheden

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