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 show herein that the population of star forming galaxies in the BremerDeep Field (BDF) have enough ionising power to form two large ionised bubbleswhich could be in the process of merging into a large one with a volume of14000 cMpc3. The sources identified in the BDF have been completed with a setof expected low luminosity sources at z $\approx$ 7. We have estimated thenumber of ionising photons per second produced by the different star forminggalaxies in the BDF. This number has been compared with the number that wouldbe required to ionise the bubbles around the two overdense regions. We haveused, as reference, ionising emissivities derived from the AMIGA cosmologicalevolutionary model. We find that even using the most conservative estimates,with a Lyman continuum escape fraction of 10\% the two regions we have definedwithin the BDF would be reionised. Assuming more realistic estimates of theionising photon production efficiency, both bubbles would be in the process ofmerging into a large reionised bubble, such as those that through percolationcompleted the reionisation of the universe by z = 6. The rather small values ofthe escape fraction required to reionise the BDF are compatible with the lowfraction of faint Ly{\alpha} emitters identified in the BDF. Finally, weconfirm that the low luminosity sources represent indeed the main contributorsto the BDF ionising photon production.

Is the Bremer Deep Field ionised, at z~7?