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We study satellite counts and quenched fractions for satellites of Milky Wayanalogs in Romulus25, a large-volume cosmological hydrodynamic simulation.Depending on the definition of a Milky Way analog, we have between 66 and 97Milky Way analogs in Romulus25, a 25 Mpc per-side uniform volume simulation. Weuse these analogs to quantify the effect of environment and host properties onsatellite populations. We find that the number of satellites hosted by a MilkyWay analog increases predominantly with host stellar mass, while environment,as measured by the distance to a Milky Way-mass or larger halo, may have anotable impact in high isolation. Similarly, we find that the satellitequenched fraction for our analogs also increases with host stellar mass, andpotentially in higher-density environments. These results are robust foranalogs within 3 Mpc of another Milky Way-mass or larger halo, theenvironmental parameter space where the bulk of our sample resides. We placethese results in the context of observations through comparisons to theExploration of Local VolumE Satellites and Satellites Around Galactic Analogssurveys. Our results are robust to changes in Milky Way analog selectioncriteria, including those that mimic observations. Finally, as our samplesnaturally include Milky Way-Andromeda pairs, we examine quenched fractions inpairs vs isolated systems. We find potential evidence, though not conclusive,that pairs, defined as being within 1 Mpc of another Milky Way-mass or largerhalo, may have higher satellite quenched fractions.

The Role of Mass and Environment on Satellite distributions around Milky Way analogs in the Romulus25 simulation