English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We combine the latest spectrally stacked data of 21-cm emission from theALFALFA survey with an updated version of the Dark Sage semi-analytic model toinvestigate the relative contributions of secular and environmentalastrophysical processes on shaping the HI fractions and quiescence of galaxiesin the local Universe. We calibrate the model to match the observed mean HIfraction of all galaxies as a function of stellar mass. Without considerationof stellar feedback, disc instabilities, and active galactic nuclei, we showhow the slope and normalisation of this relation would change significantly. Wefind Dark Sage can reproduce the relative impact that halo mass is observed tohave on satellites' HI fractions and quiescent fraction. However, the modelsatellites are systematically gas-poor. We discuss how this could be affectedby satellite--central cross-contamination from the group-finding algorithmapplied to the observed galaxies, but that it is not the full story. From ourresults, we suggest the anti-correlation between satellites' HI fractions andhost halo mass, seen at fixed stellar mass and fixed specific star formationrate, can be attributed almost entirely to ram-pressure stripping of cold gas.Meanwhile, stripping of hot gas from around the satellites drives thecorrelation of quiescent fraction with halo mass at fixed stellar mass. Furtherdetail in the modelling of galaxy discs' centres is required to solidify thisresult, however. We contextualise our results with those from othersemi-analytic models and hydrodynamic simulations.

Physical drivers of galaxies' cold-gas content: exploring environmental and evolutionary effects with DARK SAGE