Abstract

RAGA, A. C.; REIPURTH, B.  and  NORIEGA-CRESPO, A.. A windswept cloud core adjacent to HH 2. Rev. mex. astron. astrofis [online]. 2018, vol.54, n.2, pp.423-428. ISSN 0185-1101.

We analyze an Hα image of the HH 1/2 region of unprecedented depth. In this image, the outflows and other emission structures of this region are clearly seen. We focus on a description of the “hill’, which is an approximately circular feature directly to the SW of HH 2. Through an analysis of our Hα image and IR images (obtained with the IRAC camera of the Spitzer telescope), we show that while the “hill” is consistent with previous interpretations of this object as a PDR (excited by the UV radiation of HH 2), it also shows features implying that the partially photo-dissociated molecular clump is embedded in an environment which is streaming from N to S. This motion might be the result of the expansion of the Orion nebula, or of an uncollimated, outwards directed flow from the central region of the HH 1/2 system.

Keywords : evolution; HII regions; ISM: kinematics and dynamics; stars: formation.