http://arxiv.org/abs/2304.02007
We study satellite counts and quenched fractions for satellites of Milky Way analogs in Romulus25, a large-volume cosmological hydrodynamic simulation. Depending on the definition of a Milky Way analog, we have between 66 and 97 Milky Way analogs in Romulus25, a 25 Mpc-per-side uniform volume simulation. We use these analogs to quantify the effect of environment and host properties on satellite populations. We find that the number of satellites hosted by a Milky Way analog increases with host stellar mass, while there is no trend with environment, as measured by distance to a Milky Way-mass or larger halo. Similarly, we find that the satellite quenched fraction for our analogs also increases with host stellar mass, with no significant impact from environment. We place these results in the context of observations through comparisons to the ELVES and SAGA surveys. Our results are robust to changes in Milky Way analog selection criteria, including those that mimic observations. Finally, as our samples naturally include Milky Way/Andromeda pairs, we examine quenched fractions in pairs vs isolated systems. We find potential evidence, though not conclusive, that pairs may have higher satellite quenched fractions.
J. Nest, F. Munshi, C. Christensen, et. al.
Wed, 5 Apr 23
25/62
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