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We report the discovery in Hubble Space Telescope (HST) images of the newHerbig-Haro jet, HH 1019, located near the Tr 14 cluster in the Carina Nebula.Like other HH jets in the region, this bipolar collimated flow emerges from thehead of a dark dust pillar. However, HH 1019 is unique because -- unlike allother HH jets known to date -- it is identified by a linear chain of dark,dusty knots that are seen primarily in silhouette against the background screenof the H II region. Proper motions confirm that these dark condensations movealong the jet axis at high speed. [S II] emission traces a highly collimatedjet that is spatially coincident with these dust knots. The high extinction inthe body of the jet suggests that this outflow has lifted a large amount ofdust directly from the disk, although it is possible that it has entrained dustfrom its surrounding protostellar envelope before exiting the dust pillar. Ifdust in HH 1019 originates from the circumstellar disk, this provides furtherevidence for a jet launched from a range of radii in the disk, including thoseoutside the dust sublimation radius. HH 1019 may be the prototype for a newsubclass of dusty HH objects seen primarily in extinction against thebackground screen of a bright H II region. Such jets may be common, butdifficult to observe because they require the special condition of a verybright background in order to be seen in silhouette.

The Dusty Silhouette Jet HH 1019 in the Carina Nebula