The HCO^+ Molecular Outflow in NGC 2071

Details The HCO^+ Molecular Outflow in NGC 2071 The HCO^+ Molecular Outflow in NGC 2071

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522..921g&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 2, pp. 921-934.

Astronomy and Astrophysics

Astronomy

19

Ism: Individual: Ngc Number: Ngc 2071, Ism: Jets And Outflows, Ism: Molecules, Radio Lines: Ism, Stars: Formation

Scientific paper

We present high angular resolution and multitransition HCO^+ observations toward the NGC 2071 molecular outflow. Comparison of the high-velocity (HV) HCO^+ and the near-IR H_2 in the molecular outflow shows a clear correlation. At high HCO^+ flow velocities the spatial coincidence is especially remarkable. In addition, the HV HCO^+ presents clear morphological and kinematical differences with the CO outflow. These differences appear not only in the HV HCO^+ emission associated with the H_2 but in the overall outflow. There is a clear HCO^+ emission enhancement, relative to CO, at increasing flow velocities. This enhancement is probably due to an abundance enhancement produced by a velocity-dependent chemistry in the shocks. An overabundance of CH in low Mach shocks may cause the HCO^+ abundance enhancement. Because of the short cooling time for H_2, the correlation between the HCO^+ and the H_2 implies that HCO^+ emission can provide a useful tool to study in detail the current interactions of protostellar winds with the dense ambient medium. At the position of the extremely high velocity (EHV) CO component in the red lobe we detect HCO^+ (J=3-->2) emission within the velocity range of the EHV CO gas. This emission is roughly compatible with the expected HCO^+ emission associated with EHV gas arising from behind dissociative shocks.

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