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The Galactic centre stands out as the most prolific star-forming environmentof the Galaxy when averaged over volume. In the last 30 million years, it haswitnessed the formation of $\sim10^6 M_\odot$ of stars. However, crowding andhigh extinction hamper their detection and, up to now, only a small fraction ofthe expected mass of young stars has been identified. We aim to detect hiddenyoung stars at the Galactic centre by analysing the stellar population inSagittarius (Sgr) C. This is a region at the western edge of the nuclearstellar disc whose HII emission makes it a perfect candidate to host youngstars. We built dereddened luminosity functions for Sgr C and a control fieldin the central region of the nuclear stellar disc, and fitted them with alinear combination of theoretical models to analyse their stellar population.We find that Sgr C hosts several $10^5 M_\odot$ of young stars. We compared ourresults with the recently discovered young stellar population in Sgr B1, whichis situated at the opposite edge of the nuclear stellar disc. We estimated thatthe Sgr C young stars are $\sim20$ Myr old, and likely show the nextevolutionary step of the slightly younger stars in Sgr B1. Our findingscontribute to addressing the discrepancy between the expected and the detectednumber of young stars in the Galactic centre, and shed light on their evolutionin this extreme environment. As a secondary result, we find an intermediate-agestellar population in Sgr C ($\sim50$ % of its stellar mass with an age ofbetween 2 and 7 Gyr), which is not present in the innermost regions of thenuclear stellar disc (dominated by stars >7 Gyr). This supports the existenceof an age gradient and favours an inside-out formation of the nuclear stellardisc.

Hunting young stars in the Galactic centre. Hundreds of thousands of solar masses of young stars in the Sagittarius C region