We report the discovery of new Herbig-Haro ( HH ) jets in the Carina Nebula , and we discuss the protostellar outflow activity of a young OB association .
These are the first results of an H \alpha imaging survey of Carina conducted with the Hubble Space Telescope /Advanced Camera for Surveys .
Adding to the one previously known example ( HH 666 ) , we detect 21 new HH jets , plus 17 new candidate jets , ranging in length from 0.005 to 3 pc .
Using the H \alpha emission measure to estimate jet densities , we derive jet mass-loss rates ranging from 8 \times 10 ^ { -9 } to \sim 10 ^ { -6 } M _ { \odot } yr ^ { -1 } , but a comparison to the distribution of jet mass-loss rates in Orion suggests that we may be missing a large fraction of the jets below 10 ^ { -8 } M _ { \odot } yr ^ { -1 } .
A key qualitative result is that even some of the smallest dark globules with sizes of \la 1″ ( 0.01 pc ) are active sites of ongoing star formation because we see HH jets emerging from them , and that these offer potential analogs to the cradle of our Solar System because of their proximity to dozens of imminent supernovae that will enrich them with radioactive nuclides like ^ { 60 } Fe .
Whereas most proplyd candidates identified from ground-based data are dark cometary globules , HST images now reveal proplyd structures in the core of the Tr 14 cluster , only 0.1–0.2 pc from several extreme O-type stars .
Throughout Carina , some HH jets have axes bent away from nearby massive stars , while others show no bend , and still others are bent toward the massive stars .
These jet morphologies serve as “ wind socks ” ; strong photoevaporative flows can shape the jets , competing with the direct winds and radiation from massive stars .
We find no clear tendency for jets to be aligned perpendicular to the axes of dust pillars .
Finally , even allowing for a large number of jets that may escape detection , we find that HH jets are negligible to the global turbulence of the surrounding region , which is driven by massive star feedback .