http://arxiv.org/abs/2109.08387
With a hydrodynamical simulation using a simple galaxy formation model without takinginto account feedback, Liao & Gao (2019) have shown that dense and massive filaments at highredshift can provide potential wells to trap and compress gas, and hence affect galaxy formationin their resident low-mass haloes. In this paper, we make use of the Auriga simulations, a suiteof high-resolution zoom-in hydrodynamical simulations of Milky Way-like galaxies, to studywhether the conclusion still holds in the simulations with a sophisticated galaxy formationmodel. In agreement with the results of Liao & Gao (2019), we find that, comparing to theircounterparts with similar halo masses in field, dwarf galaxies residing in filaments tend to havehigher baryonic and stellar fractions. At the fixed parent halo mass, the filament dwarfs tend tohave higher star formation rates, and tend to be slightly bluer than those of field ones. We alsoshow that at high redshifts, the baryons in dwarf galaxies tend to have their spins aligned withthe filaments in which they reside. Our results support a picture in which massive filaments athigh redshift assist gas accretion and enhance star formation in their resident dwarf sized darkmatter haloes.
H. Zheng, S. Liao, J. Hu, et. al.
Mon, 20 Sep 21
44/53
Comments: 8 pages, 7 figures
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