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 results from the Keck Baryonic Structure Survey (KBSS) includingthe first detailed measurements of the column densities, kinematics, andinternal energy of metal-bearing gas within the virial radius (35-100 physicalkpc) of eight ~$L^*$ galaxies at $z\sim2$. From our full sample of 130metal-bearing absorbers, we infer that halo gas is kinematically complex whenviewed in singly, doubly, and triply ionized species. Broad OVI and CIVabsorbers are detected at similar velocities to the lower-ionization gas butwith very different kinematic structure indicating that the circumgalacticmedium (CGM) is multi-phase. There is a high covering fraction of metal-bearinggas within 100 kpc including highly ionized gas such as OVI; however,observations of a single galaxy probed by a lensed background QSO suggest thesize of metal-bearing clouds is small (<400 pc for all but the OVI-bearinggas). The mass in metals found within the halo is substantial, equivalent to$\gtrsim$ 25% of the metal mass within the interstellar medium. The gaskinematics unambiguously show that 70% of galaxies with detected metalabsorption have some unbound metal-enriched gas, suggesting galactic winds maycommonly eject gas from halos at $z\sim2$. Significant thermal broadening isdetected in CGM absorbers which dominates the internal energy of the gas. 40%of the detected gas has temperatures in the range $10^{4.5-5.5}$ K wherecooling times are short, suggesting the CGM is dynamic, with constant heatingand/or cooling to produce this short-lived thermal phase.

astrophysical journal/the astrophysical journal

The Column Density, Kinematics, and Thermal State of Metal-Bearing Gas  within the Virial Radius of z~2 Star-Forming Galaxies in the Keck Baryonic  Structure Survey