Mon. Not. R. Astron. Soc., 484, 1702-1723 (2019/April-1)
Physical properties of SDSS satellite galaxies in projected phase space.
PASQUALI A., SMITH R., GALLAZZI A., DE LUCIA G., ZIBETTI S., HIRSCHMANN M. and YI S.K.
Abstract (from CDS):
We investigate how environment affects satellite galaxies using their location within the projected phase space of their host haloes from the Wang et al.'s group catalogue. Using the Yonsei Zoom-in Cluster Simulations, we derive zones of constant mean infall time _ inf_ in projected phase space, and catalogue in which zone each observed galaxy falls. Within each zone, we compute the mean observed galaxy properties including specific star formation rate, luminosity-weighted age, stellar metallicity, and [α/Fe] abundance ratio. By comparing galaxies in different zones, we inspect how shifting the mean infall time from recent infallers (_ inf_~< 3 Gyr) to ancient infallers (_ inf_> 5 Gyr) impacts galaxy properties at fixed stellar and halo mass. Ancient infallers are more quenched, and the impact of environmental quenching is visible down to low host masses (<=group masses). Meanwhile, the quenching of recent infallers is weakly dependent on host mass, indicating they have yet to respond strongly to their current environment. [α/Fe] and especially metallicity are less dependent on host mass, but show a dependence on _ inf_. We discuss these results in the context of longer exposure times for ancient infallers to environmental effects, which grow more efficient in hosts with a deeper potential well and a denser intracluster medium. We also compare our satellites with a control field sample, and find that even the most recent infallers (_ inf_~< ∼2 Gyr) are more quenched than field galaxies, in particular for cluster mass hosts. This supports the role of pre-processing and/or faster quenching in satellites.
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: clusters: general - galaxies: evolution - galaxies: general - galaxies: haloes - galaxies: stellar content
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