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While some galactic bars show recent massive star formation (SF) along them,some others present a lack of it. Whether bars with low level of SF are aconsequence of low star formation efficiency (SFE), low gas inflow rate, ordynamical effects, remains a matter of debate. We perform a multi-wavelengthanalysis of 12 strongly barred massive galaxies, chosen to host differentdegrees of SF along the bar major axis without any prior condition on gascontent. We observe the CO(1-0) and CO(2-1) emission within bars with theIRAM-30m telescope, which we use to estimate molecular gas masses. SF rates(SFR) are calculated from GALEX near- and far- ultraviolet (UV) and WISE 12 and22 micron images within the beam pointings, covering the full bar extent. Wedetect molecular gas along the bars of all probed galaxies. The SFE in barsvaries between galaxies by up to an order of magnitude. On average, SFEs areroughly constant along bars. SFEs are not significantly different from the meanvalue in spiral galaxies reported in the literature. Interestingly, the higherthe total stellar mass of the host galaxy, the lower the SFE within their bars.In particular, the two galaxies in our sample with lowest SFEs and SFR surfacedensities (NGC 4548 and NGC 5850) are also the ones hosting massive bulges andsigns of past interactions with nearby companions. The SFE in strong bars isnot systematically inhibited (either in the central, mid- or end-parts of thebar). Both environmental and internal quenching are likely responsible for thelowest SFEs reported in this work (Abridged).

Molecular gas and star formation within 12 strong galactic bars observed with IRAM-30m