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EA: Low Surface Brightness Galaxes in the IllustrisTNG Simulation – Pérez Montaño

April 20 @ 9:45 am 10:00 am CMT

We explored the nature of Low Surface Brightness galaxies (LSBGs) in the local universe, by using a set of simulated galaxies from TNG100. We compared galaxy properties at z=0 such as stellar mass, magnitude, star formation rate and size. We found that LSBGs are mainly spirals over a large mass range, fainter, less massive, quiescent and larger than High Surface Brightness Galaxies (HSBGs). We found that LSBGs are gas-rich and with marginally younger stellar populations formed within dark matter halos with high spin parameter, retaining larger amounts of angular momentum, resulting in the trends ovserbed nowadays. We track the evolution of these quantities back in time, finding that the spin parameters of the haloes hosting LSBGs and HSBGs exhibit a clear bifurcation at $z \sim 2$, which causes a similar separation in the evolutionary tracks of other properties. The higher values of specific stellar angular momentum and halo spin in LSBGs seem to be responsible for their extended nature.

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