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 study the ionised ISM in NGC 7793 with MUSE/AO, at a spatial resolution of$\sim$ 10 pc. The data are complemented with young star clusters (YSCs), Ostars and GMCs observed with HST and ALMA. Using a strong-line method, we finda median $12 + \log(O/H) \sim 8.37$ with a scatter of 0.25 dex, in agreementwith previous estimates. The abundance map is rich in substructures,surrounding clusters and massive stars, although clear degeneracies withphotoionisation are present. We determine the observed total amount of ionisingphotons, $Q(H^0)$, from the extinction corrected H$\alpha$ luminosity, andcompare it to the expected $Q(H^0)$ obtained by summing the contributions ofYSCs and massive stars, to obtain an escape fraction ($f_{esc}$). Overall, wefind $f_{esc, HII} = 0.67_{-0.12}^{+0.08}$ for the population of HII regions.We also conclude that the sources of ionisation observed within the FoV aremore than sufficient to explain the amount of diffuse ionised gas observed inthis region of the galaxy. In general, we find that YSCs located in HII regionshave a higher probability to be younger, less massive, and to emit a highernumber of ionising photons than clusters in the rest of the field. Finally, westudy the optical depth of the regions traced by [SII]/[OIII], finding nosystematic trend between the resulting ionisation structure and $f_{esc}$.[abridged]

Studying the ISM at $\sim$10 pc scale in NGC 7793 with MUSE -- II. Constraints on the oxygen abundance and ionising radiation escape