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Star formation histories (SFHs) are integral to our understanding of galaxyevolution. We can study recent SFHs by comparing the star formation rate (SFR)calculated using different tracers, as each probes a different timescale. Weaim to calibrate a proxy for the present-day rate of change in SFR, dSFR/dt,which does not require full spectral energy distribution (SED) modeling anddepends on as few observables as possible, to guarantee its broadapplicability. To achieve this, we create a set of models in CIGALE and definean SFR change diagnostic as the ratio of the SFR averaged over the past 5 and200 Myr, <SFR5>/<SFR200>, probed by the H$\alpha$-FUV colour. We apply<SFR5>/<SFR200> to the nearby spiral NGC 628 and find that its star formationactivity has overall been declining in the recent past, with the spiral arms,however, maintaining a higher level of activity. The impact of the spiral armstructure is observed to be stronger on <SFR5>/<SFR200> than on the starformation efficiency (SFE$_\text{H$_2$}$). In addition, increasing diskpressure tends to increase recent star formation, and consequently<SFR5>/<SFR200>. We conclude that <SFR5>/<SFR200> is sensitive to the moleculargas content, spiral arm structure, and disk pressure. The <SFR5>/<SFR200>indicator is general and can be used to reconstruct the recent SFH of anystar-forming galaxy for which H$\alpha$, FUV, and either mid- or far-IRphotometry is available, without the need of detailed modeling.

The recent star formation history of NGC 628 on resolved scales