Name: Hans Zinnecker

Institution: Astrophys. Inst. Potsdam

e-mail: hzinnecker(no spam)aip.de

Partner Contry: USA

Science Meeting: Yes

User Meeting: Yes

NGO Staff Meeting: Yes

Presentation: Yes

Format: Oral

Title: High spectral resolution PHOENIX observations of the HH212 H2-jet

Co-author: S. Correia (Astrophys. Inst. Potsdam, Germany) M. McCaughrean (Univ. of Exeter, United Kingdom) S. Ridgway (NASA)

Co-authors' Institutions: Astrophys. Inst. Potsdam, Germany, Univ. of Exeter, United Kingdom and NASA

Abstract:

HH 212 near the Horsehead in Orion is the most beautiful, bi-symmetric embedded H2-jet in the sky (Zinnecker, McCaughrean, Rayner 1998, Nature). High spectral resolution (R~50,000) long slit spectroscopy of the HH212 jet bow shocks, in the 1-0 S(1) line of H2 at 2.12 microns, have been obtained using the PHOENIX spectrograph at Gemini South in good seeing conditions (0.45 arcsec). Multiple slit orientated observations of the first northern knot NK1 show that the H2 emission has a double-peaked velocity field, consistent with that of a radiative bow shock. Also, we were looking for evidence for jet rotation, but the signatures seen in the position-velocity diagrams of both the northern and southern first knots (NK1 and SK1) are complex and not easily interpretable as jet rotation, and we cannot confirm a previous tentative detection of jet rotation in HH212 with CGS4/UKIRT, claimed by Davis et al. (2000).