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

A major question in galaxy formation is how the gas supply that fuelsactivity in galaxies is modulated by their environment. We use spectroscopy ofa set of well characterized clusters and groups at $0.4<z<0.8$ from the ESODistant Cluster Survey (EDisCS) and compare it to identically selected fieldgalaxies. Our spectroscopy allows us to isolate galaxies that are dominated byold stellar populations. Here we study a stellar-mass limited sample($\log(M_*/M_\odot)>10.4$) of these old galaxies with weak [OII] emission. Weuse line ratios and compare to studies of local early type galaxies to concludethat this gas is likely excited by post-AGB stars and hence represents adiffuse gas component in the galaxies. For cluster and group galaxies thefraction with EW([OII])$>5$\AA\ is $f_{[OII]}=0.08^{+0.03}_{-0.02}$ and$f_{[OII]}=0.06^{+0.07}_{-0.04}$ respectively. For field galaxies we find$f_{[OII]}=0.27^{+0.07}_{-0.06}$, representing a 2.8$\sigma$ difference betweenthe [OII] fractions for old galaxies between the different environments. Weconclude that a population of old galaxies in all environments has ionized gasthat likely stems from stellar mass loss. In the field galaxies also experiencegas accretion from the cosmic web and in groups and clusters these galaxieshave had their gas accretion shut off by their environment. Additionally,galaxies with emission preferentially avoid the virialized region of thecluster in position-velocity space. We discuss the implications of our results,among which is that gas accretion shutoff is likely effective at group halomasses (log~${\cal M}/$\msol$>12.8$) and that there are likely multiple gasremoval processes happening in dense environments.

Determining the Halo Mass Scale where Galaxies Lose Their Gas