@article{a5e8387810ee45f1826a4b72800ea972,
title = "The nature of submillimetre and highly star-forming galaxies in the EAGLE simulation",
abstract = "We exploit EAGLE, a cosmological hydrodynamical simulation, to reproduce the selection of the observed submillimetre (submm) galaxy population by selecting the model galaxies at z ≥ 1 with mock submm fluxes S850 μm ≥ 1 mJy. We find a reasonable agreement between the model galaxies within this sample and the properties of the observed submm population, such as their star formation rates (SFRs) at z < 3, redshift distribution, and many integrated galaxy properties. We find that the median redshift of the S850 μm ≥ 1 mJy model population is z ≈ 2.5, and that they are massive galaxies (M~ ~ 1011 M☉) with high dust masses (Mdust ~ 108 M☉), gas fractions (fgas ≈ 50 per cent), and SFRs (M~ ≈ 100 M☉ yr−1). In addition, we find that they have major and minor merger fractions similar to the general population, suggesting that mergers are not the sole driver of the high SFRs in the model submm galaxies. Instead, the S850 μm ≥ 1 mJy model galaxies yield high SFRs primarily because they maintain a significant gas reservoir as a result of hosting an undermassive black hole relative to comparably massive galaxies. Not all {\textquoteleft}highly star-forming{\textquoteright} (M∗ ≥ 80 M☉ yr−1) EAGLE galaxies have submm fluxes S850 μm ≥ 1 mJy. We investigate the nature of these highly star-forming {\textquoteleft}Submm-Faint{\textquoteright} galaxies (i.e. M~ ≥ 80 M☉ yr−1 but S850 μm < 1 mJy) and find that they are similar to the model submm galaxies, being gas rich and hosting undermassive black holes. However, they are also typically at higher redshifts (z > 4) and are lower mass (M~ ~ 1010 M☉). These typically higher redshift galaxies show stronger evidence for having been triggered by major mergers, and critically, they are likely missed by most current submm surveys due to their higher dust temperatures and lower dust masses.",
keywords = "Galaxies: active, Galaxies: evolution, Galaxies: formation, Galaxies: high-redshift, Galaxies: starburst, UKRI, STFC, ST/P000541/1, ST/K00042X/1, ST/H008519/1, ST/K003267/1",
author = "Stuart McAlpine and Ian Smail and Bower, {Richard G.} and Swinbank, {A. M.} and Trayford, {James W.} and Tom Theuns and Maarten Baes and Peter Camps and Crain, {Robert A.} and Joop Schaye",
note = "Funding Information: This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). This equipment was funded by BIS National E-infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC Operations grant ST/K003267/1 and Durham University. DiRAC is part of the National E-Infrastructure. Funding Information: SM thanks Michelle Furlong and Jonathan Davies for their many contributions to this work. This work was supported by the Science and Technology Facilities Council (grant number ST/P000541/1) and the Academy of Finland (grant number 314238). RAC is aRoyal Society University Research Fellow. IRS acknowledges support from the ?0:named-c ontent 0:content-type={"}word-wrap{"}??0:funding-source ?ERC?/0: funding-source??/0:named-content? Advanced Grant DUSTYGAL (321334). This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). This equipment was funded by BIS National E-infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC Operations grant ST/K003267/1 and Durham University. DiRAC is part of the National E-Infrastructure. Funding Information: Finland (grant number 314238). RAC is aRoyal Society University Research Fellow. IRS acknowledges support from the 〈0:named-c ontent 0:content-type={"}word-wrap{"}〉〈0:funding-source 〉ERC〈/0: funding-source〉〈/0:named-content〉 Advanced Grant DUSTYGAL (321334). Funding Information: This work was supported by the Science and Technology Facilities Council (grant number ST/P000541/1) and the Academy of Publisher Copyright: {\textcopyright} 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2019",
month = sep,
day = "1",
doi = "10.1093/mnras/stz1692",
language = "English",
volume = "488",
pages = "2440--2454",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",
}