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 a comprehensive and detailed study of the stellar populations ofthe Fornax dwarf spheroidal galaxy. We analyse their spatial distributionsalong the main body of the galaxy, obtaining their surface density maps,together with their radial density profiles. Results are based on the largestand most complete catalogue of stars in Fornax, with more than$3.5\times10^{5}$ stars covering the main body of the galaxy up to $V \sim 24$.We find a differentiated structure in Fornax depending on the stellar ages. Oldstars ($\gtrsim 10$ Gyr) follow an elliptical distribution well fitted by Kingprofiles with relatively large core radius ($r_{\rm c} = 760\pm60$ pc). Onanother hand, young populations ($\lesssim 3$ Gyr) concentrate in the centralregion of the galaxy ($r_{\rm c} = 210\pm10$ pc), and are better fitted bySersic profiles with $0.8 < n < 1.2$, indicating some discy shape. These starsshow strong asymmetries and substructures not aligned with the main opticalaxes of Fornax. This together with the observed differences between metallicityand age distribution maps strongly suggests accretion of material withdifferent angular momentum. These results lead us to propose a scenario inwhich Fornax has suffered a major merger at $z\sim1$.

Merger traces in the spatial distribution of stellar populations in the Fornax dSph galaxy