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• W2025304087 endingPage "2547" @default.
• W2025304087 startingPage "2529" @default.
• W2025304087 abstract "High-redshift submillimetre galaxies (SMGs) are some of the most rapidly star-forming galaxies in the Universe. Historically, galaxy formation models have had difficulty explaining the observed number counts of SMGs. We combine a semi-empirical model with 3D hydrodynamical simulations and 3D dust radiative transfer to predict the number counts of unlensed SMGs. Because the stellar mass functions, gas and dust masses, and sizes of our galaxies are constrained to match observations, we can isolate uncertainties related to the dynamical evolution of galaxy mergers and the dust radiative transfer. The number counts and redshift distributions predicted by our model agree well with observations. Isolated disc galaxies dominate the faint (S1.1 ≲ 1 or S850 ≲ 2 mJy) population. The brighter sources are a mix of merger-induced starbursts and galaxy-pair SMGs; the latter subpopulation accounts for ∼30–50 per cent of all SMGs at all S1.1 ≳ 0.5 mJy (S850 ≳ 1 mJy). The mean redshifts are ∼3.0–3.5, depending on the flux cut, and the brightest sources tend to be at higher redshifts. Because the galaxy-pair SMGs will be resolved into multiple fainter sources by the Atacama Large Millimeter/submillimeter Array (ALMA), the bright ALMA counts should be as much as two times less than those observed using single-dish telescopes. The agreement between our model, which uses a Kroupa initial mass function (IMF), and observations suggests that the IMF in high-redshift starbursts need not be top heavy; if the IMF were top heavy, our model would overpredict the number counts. We conclude that the difficulty some models have reproducing the observed SMG counts is likely indicative of more general problems – such as an underprediction of the abundance of massive galaxies or a star formation rate and stellar mass relation normalization lower than that observed – rather than a problem specific to the SMG population." @default.
• W2025304087 created "2016-06-24" @default.
• W2025304087 creator A5038938655 @default.
• W2025304087 creator A5039703536 @default.
• W2025304087 creator A5046433979 @default.
• W2025304087 creator A5057320280 @default.
• W2025304087 creator A5072430357 @default.
• W2025304087 creator A5081711451 @default.
• W2025304087 creator A5083397483 @default.
• W2025304087 date "2012-11-14" @default.
• W2025304087 modified "2023-10-18" @default.
• W2025304087 title "Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution and implications for the IMF" @default.
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