Star formation suppression, gas consumption and stripping in cluster satellites.

Zadvornyi, Anatolii (2021) Star formation suppression, gas consumption and stripping in cluster satellites. Master's Thesis / Essay, Astronomy.

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Abstract

Galaxies are affected by their environment, which can shut down their star formation, a process called quenching. Observations show that there is a peak in the quenching timescale of satellite galaxies for satellites of M_star = 10^9 M_sun; less and more massive satellite galaxies quench on shorter timescales. We investigated the origin of the peak in the quenching timescales as a function of stellar mass using EAGLE cosmological simulations of galaxy formation and evolution. The simulations qualitatively reproduce the observed trend, but place a peak at higher M_star. We select gas particles bound to satellite galaxies at infall time and track their subsequent evolution to find the prevailing mechanism that removes their gas. Low-mass satellites have part of their star forming gas mechanically removed by ram pressure stripping, this effect becomes less effective with increasing stellar mass. Higher mass satellites are quenched relatively quickly by starvation, which becomes less effective at lower masses. Intermediate mass satellites with a characteristic stellar mass of M_c = 10^9.75 M_sun are at the intersection where both mechanisms are least effective. Galaxies at and below M_c have a virial temperature T_vir, low enough such that all of their halo gas can potentially cool on relatively short timescales and fuel the cold reservoir. Galaxies above M_c have high enough T_vir such that the cooling times of fraction of halo gas can be longer than Hubble time.

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Verheijen, M.A.W.
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	13 Jul 2021 12:55
Last Modified:	13 Jul 2021 12:55
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/25208

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