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 new [O III] 88 ${\rm \mu}$m observations of five bright $z \sim 7$Lyman-break galaxies spectroscopically confirmed by ALMA through the [C II] 158${\rm \mu}$m line, unlike recent [O III] detections where Lyman-${\rm \alpha}$was used. This nearly doubles the sample of Epoch of Reionisation galaxies withrobust ($5 \sigma$) detections of [C II] and [O III]. We perform amulti-wavelength comparison with new deep HST images of the rest-frame UV,whose compact morphology aligns well with [O III] tracing ionised gas. Bycontrast, we find more spatially extended [C II] emission likely produced inneutral gas, as indicated by a [N II] 205 ${\rm \mu}$m non-detection in onesource. We find a positive correlation between the equivalent width of theoptical [O III] and H${\rm \beta}$ lines and the [O III]/[C II] ratio, as seenin local metal-poor dwarf galaxies. Cloudy models of a nebula of typicaldensity harbouring a young stellar population with a high ionisation parameterappear to adequately reproduce the far-infrared lines. Surprisingly, however,our models fail to reproduce the strength of [O III] 88 ${\rm \mu}$m, unless weassume an ${\rm \alpha}$/Fe enhancement and a near-solar nebular oxygenabundance. On spatially resolved scales, we find [O III]/[C II] shows atentative anti-correlation with infrared excess, $L_{\rm IR}/L_{\rm UV}$, alsoseen on global scales in the local Universe. Finally, we introduce thefar-infrared spectral energy distribution fitting code MERCURIUS to show thatdust-continuum measurements of one source appear to favour a low dusttemperature coupled with a high dust mass. This implies a high stellarmetallicity yield and may point towards the need of dust production orgrain-growth mechanisms beyond supernovae.

Dual constraints with ALMA: new [O III] 88 ${\rm \mu}$m and dust-continuum observations reveal the ISM conditions of luminous LBGs at $z \sim 7$