On the evolution of low-mass central galaxies in the vicinity of massive structures
Daniela Palma
We focus on the evolution of low-mass central galaxies with stellar masses of Mstar = 10^{9.5 – 10} Msun/h at z =0 using the semi-analytic model of galaxy formation MDPL2-SAG and the hydrodynamical simulation IllustrisTNG300. We set out to study how their properties, such as halo, stellar and gas mass, and specific star formation rate (sSFR), depend on the presence of nearby massive groups and galaxy clusters. In addition, we study the correlation in the sSFR of low-mass central galaxies with their neighbors, called two-halo galactic conformity, up to 10 Mpc/h. Our results show that former satellites, i.e., galaxies that at present are centrals but were satellites in the past, can explain in part the correlation produced in the low-mass regime. I will present the results of the two-halo conformity at three different redshifts: z = 0, 0.3, and 1.0, and discuss the contribution of the former satellites to the conformity signal at different epochs.
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Wed
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