Dusty star-forming galaxies in FLAMINGO simulations and prediction for future surveys
Ankit Kumar
Submillimeter observations of dusty star-forming galaxies (DSFGs) have significantly advanced our understanding of galaxy formation and evolution at high redshifts. DSFGs, which are precursors to present-day elliptical galaxies, serve as effective tracers of over-dense regions, making them valuable indicators of protocluster regions. Studying DSFGs within a cosmologically representative volume is crucial for comprehending dust-obscured star formation and enhancing predictions for current and future observational facilities, such as ALMA, LMT/TolTEC, AtLAST, and LST. We test the predictions of various parametric models with radiative transfer calculations on EAGLE simulations and use the best model for FLAMINGO hydrodynamical simulations. FLAMINGO has a (2.8 cGpc)^3 volume and the largest number of resolution elements for any existing cosmological hydrodynamical simulations. Our results show remarkable consistency with observed redshift distribution and number counts of DSFGs. We also use our sample to predict the contribution of DSFGs to the cosmic star formation rate and redshift evolution of their flux density functions. Our results indicate a steady increase in DSFGs from redshift z=6 to 2.5, followed by a rapid decrease in bright submillimeter sources from z=2.5 to the present. Additionally, we have made projections for future TolTEC surveys. Our results suggest that the DSFGs detected with TolTEC contribute 25-45% of the cosmic star formation rate at around redshift 3.0.
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