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

Combining 66 ultraviolet (UV) spectra and ancillary data from theLow-Redshift Lyman Continuum Survey (LzLCS) and 23 LyC observations by earlierstudies, we form a statistical sample of star-forming galaxies at $z \sim 0.3$to study the role of the cold interstellar medium (ISM) gas in the leakage ofionizing radiation. We first constrain the massive star content (ages andmetallicities) and UV attenuation, by fitting the stellar continuum with acombination of simple stellar population models. The models, together withaccurate LyC flux measurements, allow to determine the absolute LyC photonescape fraction for each galaxy ($f_{\rm esc}^{\rm abs}$). We measure theequivalent widths and residual fluxes of multiple HI and low-ionization state(LIS) lines, and the geometrical covering fraction adopting the picket-fencemodel. The $f_{\rm esc}^{\rm abs}$ spans a wide range, with a median (0.16,0.84 quantiles) of 0.04 (0.02, 0.20), and 50 out of the 89 galaxies detected inthe LyC. The HI and LIS line equivalent widths scale with the UV luminosity andattenuation, and inversely with the residual flux of the lines. The HI and LISresidual fluxes are correlated, indicating that the neutral gas is spatiallytraced by the LIS transitions. We find the observed trends of the absorptionlines and the UV attenuation are primarily driven by the covering fraction. Thenon-uniform gas coverage demonstrates that LyC photons escape throughlow-column density channels in the ISM. The equivalent widths and residualfluxes of the UV lines strongly correlate with $f_{\rm esc}^{\rm abs}$: strongLyC leakers show weak absorption lines, low UV attenuation, and largeLy$\alpha$ equivalent widths. We finally show that simultaneous UV absorptionline and dust attenuation measurements can predict, on average, the escapefraction of galaxies and the method can be applied to galaxies across a wideredshift range.

The Low-Redshift Lyman Continuum Survey. Unveiling the ISM properties of low-$z$ Lyman continuum emitters