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The filament IRDC G035.39--00.33 in the W48 molecular complex is one of thedarkest infrared clouds observed by \textit{Spitzer}. It has been observed bythe PACS (70 and 160\,$\micron$) and SPIRE (250, 350, and 500\,$\micron$)cameras of the \textit{Herschel} Space Observatory as part of the W48 molecularcloud complex in the framework of the HOBYS key programme. The observationsreveal a sample of 28 compact sources (deconvolved FWHM sizes $<$0.3 pc)complete down to $\sim$$5 \msun$ in G035.39--00.33 and its surroundings. Amongthem, 13 compact sources are massive dense cores with masses $>$$20 \msun$. Thecloud characteristics we derive from the analysis of their spectral energydistributions are masses of $20-50 \msun$, sizes of 0.1--0.2 pc, and averagedensities of $2-20 \times 10^{5} \cmc$, which make these massive dense coresexcellent candidates to form intermediate- to high-mass stars. Most of themassive dense cores are located inside the G035.39--00.33 ridge and hostIR-quiet high-mass protostars. The large number of protostars found in thisfilament suggests that we are witnessing a mini-burst of star formation with anefficiency of $\sim$15% and a rate density of $\sim$$40\msun\,$yr$^{-1}\,$kpc$^{-2}$ within $\sim$8 pc$^2$, a large area covering thefull ridge.  Part of the extended SiO emission observed towards G035.39--00.33 is notassociated with obvious protostars and may originate from low-velocity shockswithin converging flows, as advocated by previous studies.

The Herschel view of massive star formation in G035.39--00.33: Dense and cold filament of W48 undergoing a mini-starburst