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First Light And Reionisation Epoch Simulations (FLARES) II: the photometric properties of high-redshift galaxies
journal contribution
posted on 2023-06-09, 22:38 authored by Aswin Payyoor VijayanAswin Payyoor Vijayan, Christopher Lovell, Stephen WilkinsStephen Wilkins, Peter ThomasPeter Thomas, David J Barnes, Dimitrios Irodotou, Jussi KuusistoJussi Kuusisto, William RoperWilliam RoperWe present the photometric properties of galaxies in the First Light and Reionisation Epoch Simulations (FLARES). The simulations trace the evolution of galaxies in a range of overdensities through the Epoch of Reionistion (EoR). With a novel weighting scheme we combine these overdensities, extending significantly the dynamic range of observed composite distribution functions compared to periodic simulation boxes. FLARES predicts a significantly larger number of intrinsically bright galaxies, which can be explained through a simple model linking dust-attenuation to the metal content of the interstellar medium, using a line-of-sight (LOS) extinction model. With this model we present the photometric properties of the FLARES galaxies for z ? [5, 10]. We show that the ultraviolet (UV) luminosity function (LF) matches the observations at all redshifts. The function is fit by Schechter and double power-law forms, with the latter being favoured at these redshifts by the FLARES composite UV LF. We also present predictions for the UV continuum slope as well as the attenuation in the UV. The impact of environment on the UV LF is also explored, with the brightest galaxies forming in the densest environments. We then present the line luminosity and equivalent widths of some prominent nebular emission lines arising from the galaxies, finding rough agreement with available observations. We also look at the relative contribution of obscured and unobscured star formation, finding comparable contributions at these redshifts.
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Publication status
- Published
File Version
- Accepted version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
3Volume
501Page range
3289-3308Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-01-06First Open Access (FOA) Date
2021-01-06First Compliant Deposit (FCD) Date
2021-01-05Usage metrics
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