A survey of high-velocity molecular gas near Herbig-Haro objects. II

Abstract

A previous search for high-velocity molecular gas in the vicinity of Herbig-Haro objects is extended. New observations at the (C-12)O J = 1-0 transition obtained with the 14 m telescope of the Five College Radio Astronomy Observatory reveal four sites of spatially limited supersonic molecular gas which are tentatively identified as additional energetic outflows in the vicinity of Herbig-Haro objects. One is in the NGC 1999 region, two are in the neighborhood of RNO 43, and one is coincident with the newly discovered H2O maser in NGC 2068. A summary of 17 energetic molecular outflows in the vicinity of Herbig-Haro objects is presented, and the association between optically emitting shocks and large-scale expanding gas is discussed. The previous estimate that at least all stars as massive as 1 solar mass undergo a phase of mass loss of not less than about 10 to the -7th solar mass/yr for a period of about 10,000 yr is upheld by the new observations.