A new Herbig-Haro flow in the HH 1-2 complex

Abstract

We report the discovery of new faint Herbig-Haro knots in the vicinity of the well-known HH 1-2 bipolar flow. HH 144 forms a well-collimated structure 83″ long with numerous faint knots, while HH 145 is a more disorganized group of knots further to the west. Proper motion measurements of the two brightest knots in HH 144 show a large motion away from the vicinity of VLA 1, the source of the HH 1-2 flow. The alignment of the HH 144 knots suggests, however, that a faint previously known VLA source, VLA 2, located 3″ from VLA 1, is the source of the new flow. This is confirmed by a very deep infrared K-band image, which shows reflection nebulae fanning out from VLA 1 toward HH 1 and from VLA 2 toward HH 144