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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The Galactic Center (GC) is surrounded by plasma lobes that extend up to ~14kpc above and below the plane. Until now, UV absorption studies of these lobeshave only focused on high-velocity components (|v_LSR| > 100 km/s) because low-and intermediate-velocity (LIV) components (|v_LSR| <100 km/s) are blended withforeground interstellar medium. To overcome this difficulty, we present adifferential experiment to compare the LIV absorption between differentstructures within the GC region, including the Fermi Bubbles (FBs; seen ingamma-rays), the eROSITA Bubbles (eBs; seen in X-rays), and the Loop I NorthPolar Spur (LNPS) association, an X-ray and radio feature within the northerneB. We use far-UV spectra from Hubble Space Telescope to measure LIV Si IVabsorption in 61 AGN sight lines, of which 21 pass through the FBs, 53 passthrough the eBs, and 18 pass through the LNPS. We also compare our measurementsto those in the literature from sight lines covering the disk-halo interfaceand CGM. We find that the FBs and eBs have enhancements in measured columns of0.22-0.29 dex in log. We also remove the contribution of a modeled disk and CGMcomponent from the measured Si IV columns and find that the northern eB stillretains a Si IV enhancement of 0.62 dex in log. A similar enhancement is notseen in the southern eB. Since the LNPS model-subtracted residuals show anenhancement compared to the rest of the northern eB of 0.69 dex, the northerneB enhancement may be caused by the LNPS.

The Signature of the Northern Galactic Center Region in Low-Velocity UV Absorption