Link to paper here.
Authors: C.B. Brook, G.Stinson, B.K. Gibson, R. Roškar, J. Wadsley, T. Quinn
In this paper, the second in a suite, the authors are using cosmological zoom simulations to investigate the possibility of forming a bulgeless disc galaxy. Starting with initial conditions from the McMaster Unbiased Galaxy Simulations (MUGS) project, their programme is running disc galaxy re-simulations spanning 4 order of magnitude in stellar mass. After showing in their first paper that ejection of low angular momentum material enables the formation of bulgeless dwarf disc galaxies, this works introduces the mechanism of redistribution of momentum by galactic fountain as a possible solution to the angular momentum problem for intermediate mass disc galaxies.
After presenting the evolution of the main properties of the simulated object (especially the formation of a secular pseudo-bulge via bar/disc instabilities), they study in detail the evolution of the "bulge gas" (BG) since the last major merging epoch. They find that, after expelling most of this BG by efficient SNe activity during the starburst phase, by z=0, 71% of the BG has been brought back to the disk to form stars. The authors show that during the re-accretion of the BG via the galactic fountain, the material has gained angular momentum which prevent from accumulating gas to the centre of the galaxy, and hence prevent the formation of a too massive bulge.
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