Abstract

CRUZ-GONZALEZ, Irene; SALAS, Luis  and  HIRIART, David. H₂ Velocity structure in the molecular outflow DR 21¹. Rev. mex. astron. astrofis [online]. 2007, vol.43, n.2, pp.337-352. ISSN 0185-1101.

We describe the velocity structure of the molecular outflow DR 21 in the 2.12 µm line of H₂. Velocity cubes were obtained of the entire outflow emission using a scanning IR Fabry-Pérot interferometer with a spectral resolution of 24 km s^-1. H2 emission was detected from both the DR 21 (E) and DR 21 (W) lobes in a velocity interval (-80.82, +46.84) km s^-1. The most conspicuous sources found include a jet-like region and a possible counter-jet or an independent jet, an elliptical cavity and four bow-like structures. The velocity data cube was used to calculate the four velocity moment images of the outflow to study the moments along the outflow axis. Turbulence in the outflow is studied via a Clump Find analysis. Relations between clump parameters and kinematics allowed us to derive power-law relations in agreement with Larson's laws.

Keywords : ISM; Individual (DR 21)-ISM; Jets and outflows-ISM; kinematics and dynamics-ISM; molecules-start; formation.