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 present a detailed study of two partial Lyman limit systems (pLLSs) ofneutral hydrogen column density$N_\mathrm{H\,I}\approx(1-3)\times10^{16}\,\mathrm{cm}^{-2}$ discovered at$z=0.5$ in the Cosmic Ultraviolet Baryon Survey (CUBS). Availablefar-ultraviolet spectra from the Hubble Space Telescope Cosmic OriginsSpectrograph and optical echelle spectra from MIKE on the Magellan Telescopesenable a comprehensive ionization analysis of diffuse circumgalactic gas basedon resolved kinematics and abundance ratios of atomic species spanning fivedifferent ionization stages. These data provide unambiguous evidence ofkinematically aligned multi-phase gas that masquerades as a single-phasestructure and can only be resolved by simultaneous accounting of the full rangeof observed ionic species. Both systems are resolved into multiple componentswith inferred $\alpha$-element abundance varying from$[\alpha/\text{H}]\approx\!{-0.8}$ to near solar and densities spanning overtwo decades from $\log n_\mathrm{H}\mathrm{cm}^{-3}\approx\!-2.2$ to $<-4.3$.Available deep galaxy survey data from the CUBS program taken with VLT/MUSE,Magellan/LDSS3-C and Magellan/IMACS reveal that the $z=0.47$ system is located55 kpc from a star-forming galaxy with prominent Balmer absorption of stellarmass $M_\star\approx2\times10^{10}M_\odot$, while the $z=0.54$ system residesin an over-dense environment of 11 galaxies within 750 kpc in projecteddistance, with the most massive being a luminous red galaxy of$M_\star\approx2\times10^{11}M_\odot$ at 375 kpc. The study of these two pLLSsadds to an emerging picture of the complex, multiphase circumgalactic gas thatvaries in chemical abundances and density on small spatial scales in diversegalaxy environments. The inhomogeneous nature of metal enrichment and densityrevealed in observations must be taken into account in theoretical models ofdiffuse halo gas.

The Cosmic Ultraviolet Baryon Survey (CUBS) IV: The Complex Multiphase Circumgalactic Medium as Revealed by Partial Lyman Limit Systems