A SURVEY OF OPTICAL JETS AND HERBIG-HARO OBJECTS IN THE P-OPHIUCHI CLOUD CORE

We describe a deep narrowband [S II] imaging survey of similar to 0.7 deg(2) covering the rho Ophiuchi cloud core (L1688). We detect seven n ew jet/Herbig-Haro (HH) objects in our survey, of which three are new detections and four confirm candidates from a recent survey by Wilking et al. Together with the five previously known objects, this brings t he total to 12 known jet/HH objects in the cloud. In addition to this, we propose six new candidate HH objects. The most likely sources to p ower the new jet/HH objects appear to be optically visible stars; howe ver, a conclusive association between the HH objects and pre-main-sequ ence stars is difficult, as several candidate driving sources lie in c lose vicinity of the new knots. Practically all of the HH objects are located on the perimeter of the cloud. The lack of optical emission to ward the center of the cloud and the high spatial concentration of the youngest protostars toward the densest regions strongly suggest that jets inside the cloud are obscured from our view at optical wavelength s. A near-infrared H-2 survey is required to penetrate into the cloud and to study the outflow activity in this extremely active star-formin g region.