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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We analyze the intracluster medium (ICM) and circumgalactic medium (CGM) in 7X-ray detected galaxy clusters using spectra of background QSOs (HST-COS/STIS),optical spectroscopy of the cluster galaxies (MMT/Hectospec and SDSS), andX-ray imaging/spectroscopy (XMM-Newton and Chandra). First, we report a verylow covering fraction of H I absorption in the CGM of these cluster galaxies,f_c = 25% +25%/-15%, to stringent detection limits (log N(H I) < 13 cm^-2). Asfield galaxies have an H I covering fraction of ~100% at similar radii, thedearth of CGM H I in our data indicates that the cluster environment haseffectively stripped or overionized the gaseous halos of these clustergalaxies. Second, we assess the contribution of warm-hot (10^5 - 10^6 K) gas tothe ICM as traced by O VI and broad Ly-alpha (BLA) absorption. Despite the highsignal-to-noise of our data, we do not detect O VI in any cluster, and we onlydetect BLA features in the QSO spectrum probing one cluster. We estimate thatthe total column density of warm-hot gas along this line of sight totals to ~3%of that contained in the hot T > 10^7 K X-ray emitting phase. Residing at highrelative velocities, these features may trace pre-shocked material outside thecluster. Comparing gaseous galaxy halos from the low-density 'field' to galaxygroups and high-density clusters, we find that the CGM is progressivelydepleted of H I with increasing environmental density, and the CGM is mostseverely transformed in galaxy clusters. This CGM transformation may play a keyrole in environmental galaxy quenching.

Warm-hot Gas in X-ray Bright Galaxy Clusters and the H I-deficient Circumgalactic Medium in Dense Environments