HH 478B , the SIMBAD biblio

We have surveyed an area of 3.15°² in the Serpens star forming region with the Tautenburg Schmidt telescope in the [SII]λλ6716,6730 lines searching for outflows from young stars. We find that the outflow activity is mainly concentrated on a region of about 15' (1.3pc) diametre around the Serpens Reflection Nebula (SRN). Here, we discovered six new groups of HH objects in addition to the already known HH 106/107, probably forming five or six independent outflows. Much further away from the SRN we observed two more outflows: a newly discovered object about 45' south of the SRN near a group of nebulous stars, and the known HH 108/109, for which we present also near-infrared molecular hydrogen imaging. We discuss the potential exciting sources for the outflows in the Serpens dark clouds, and the connection between optical HH objects and molecular hydrogen knots observed in this region. We also note that there is only one parsec-scale flow seen among then HH flows in Serpens. We interpret this as the flows breaking rapidly out of their dense parental clouds into the very tenuous surroundings, in which no further shock excitation of the true terminal working surfaces can take place.