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We report the large effort which is producing comprehensive high-level youngstar cluster (YSC) catalogues for a significant fraction of galaxies observedwith the Legacy ExtraGalactic UV Survey (LEGUS) Hubble treasury program. Wepresent the methodology developed to extract cluster positions, verify theirgenuine nature, produce multiband photometry (from NUV to NIR), and derivetheir physical properties via spectral energy distribution fitting analyses. Weuse the nearby spiral galaxy NGC628 as a test case for demonstrating the impactthat LEGUS will have on our understanding of the formation and evolution ofYSCs and compact stellar associations within their host galaxy. Our analysis ofthe cluster luminosity function from the UV to the NIR finds a steepening atthe bright end and at all wavelengths suggesting a dearth of luminous clusters.The cluster mass function of NGC628 is consistent with a power-law distributionof slopes $\sim -2$ and a truncation of a few times $10^5$ M$_\odot$. Aftertheir formation YSCs and compact associations follow different evolutionarypaths. YSCs survive for a longer timeframe, confirming their being potentiallybound systems. Associations disappear on time scales comparable tohierarchically organized star-forming regions, suggesting that they areexpanding systems. We find mass-independent cluster disruption in the innerregion of NGC628, while in the outer part of the galaxy there is little or nodisruption. We observe faster disruption rates for low mass ($\leq$ $10^4$M$_\odot$) clusters suggesting that a mass-dependent component is necessary tofully describe the YSC disruption process in NGC628.

astrophysical journal/the astrophysical journal

Legacy ExtraGalactic UV Survey with The Hubble Space Telescope. Stellar  cluster catalogues and first insights into cluster formation and evolution in  NGC 628