Kinematics of Herbig-Haro objects and jets in the Orion Nebula

We have surveyed the inner 5' of the Orion Nebula by means of Ha and [N II] Fabry-Perot imaging spectroscopy to present a kinematical study of the Her big-Haro objects in the nebula. The objects studied in this work are HH 202 , 203, 204, 529, 269, and other associated features. For HH 202 we find new features that, because of their high velocities (up to 100 km s(-1)), indi cate the presence of an outflow that probably is an HH flow not cataloged p reviously. HH 202 could be only a part of this larger outflow. Large intern al motions are found in the fainter regions of HH 203-204, as well as evide nce of transverse density gradients that could account for the asymmetry in the brightness distribution of HH 204. We report for the first time a high blueshifted velocity (-118 km s(-1)) associated with HH 204 and show that the apex of HH 204 is indeed the zone of maximum velocity, in agreement wit h bow shock models. We also studied the radial velocity field of HH 269, fi nding features associated with the HH object. From our studies, we find kin ematic evidence that suggests HH 203-204 and HH 202 are part of a big (simi lar to0.55 pc) bipolar HH outflow.