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arXiv · 2303.15518

ZFIRE -- The Gas Inflow Inequality for Satellite Galaxies in Cluster and Field Halos at z = 2

Anishya Harshan·Kim-Vy Tran·Anshu Gupta·Glenn G. Kacprzak·Themiya Nanayakkara
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Abstract

Gas inflow into galaxies should affect the star formation and hence the evolution of galaxies across cosmic time. In this work, we use TNG100 of the IllustrisTNG simulations to understand the role of environment on gas inflow rates in massive galaxies at z >= 2. We divide our galaxies (log(M*/Msolar )>= 10.5) into cluster (log Mhalo/Msolar >= 13) and field (log Mhalo/Msolar < 13) galaxies at z = 2 and further divide into centrals and satellites. We track their gas inflow rates from z = 6 to 2 and find that the total gas inflow rates of satellite galaxies rapidly decline after their infall into cluster halos and as they reach the cluster center. At z = 2, the gas inflow rate of cluster satellite galaxies is correlated with the cluster-centric radii and not the host halo mass. In contrast, the gas inflow rate in centrals is strongly correlated with the host halo mass at z >= 2. Our study indicates that between redshifts 6 to 2, the gas that normally is accreted by the satellite galaxies is redirected to the center of the cluster halo as inflows to the cluster centrals and forming the intra-cluster medium. Our analysis suggest that the inequality of gas accretion between massive satellite and central galaxies is responsible for the starvation of cluster satellite galaxies that evolve into the massive quenched cluster galaxies observed at z<0.5.

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Anishya Harshan, Kim-Vy Tran, Anshu Gupta, Glenn G. Kacprzak, Themiya Nanayakkara. 2023-03-27. ZFIRE -- The Gas Inflow Inequality for Satellite Galaxies in Cluster and Field Halos at z = 2. https://doi.org/10.1093/mnras%2Fstad959

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