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Aims: Jets are excellent signposts for very young embedded protostars, so wewant to identify jet-driving protostars as a tracer of the currently forminggeneration of stars in the Carina Nebula, which is one of the most massivegalactic star-forming regions and which is characterised by particularly highlevels of massive-star feedback on the surrounding clouds.  Methods: We used archive data to construct large (> 2 deg x 2 deg) SpitzerIRAC mosaics of the Carina Nebula and performed a spatially complete search forobjects with excesses in the 4.5 micron band, typical of shock-excitedmolecular hydrogen emission. We also identified the mid-infrared point sourcesthat are the likely drivers of previously discovered Herbig-Haro jets andmolecular hydrogen emission line objects. We combined the Spitzer photometrywith our recent Herschel far-infrared data to construct the spectral energydistributions, and used the Robitaille radiative-transfer modelling tool toinfer the properties of the objects.  Results: The radiative-transfer modelling suggests that the jet sources areprotostars with masses between ~1 M_sol and ~10 M_sol that are surrounded bycircumstellar disks and embedded in circumstellar envelopes.  Conclusions: The estimated protostar masses < 10 M_sol suggest that thecurrent star-formation activity in the Carina Nebula is restricted to low- andintermediate-mass stars. More optical than infrared jets can be observed,indicating that star formation predominantly takes place close to the surfacesof clouds.

Jet-driving protostars identified from infrared observations of the Carina Nebula complex