ISO observations of molecular hydrogen in the DR21 bipolar outflow

Details ISO observations of molecular hydrogen in the DR21 bipolar outflow ISO observations of molecular hydrogen in the DR21 bipolar outflow

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297..687s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 3, pp. 687-691.

Astronomy and Astrophysics

Astronomy

12

Shock Waves, Ism: Individual: Dr21, Ism: Jets And Outflows, Ism: Molecules, Infrared: Ism: Lines And Bands

Scientific paper

We demonstrate that a wide range of molecular hydrogen excitation can be observed in protostellar outflows at wavelengths in excess of 5 mum. Cold H_2 in DR21 is detected through the pure rotational transitions in the ground vibrational level (0-0). Hot H_2 is detected in pure rotational transitions within higher vibrational levels (1-1, 1-2, etc.). Although this emission is relatively weak, we have detected two 1-1 lines in the DR21 outflow with the ISO SWS instrument. We thus investigate molecular excitation over energy levels corresponding to the temperature range 1015-15722K, without the uncertainty introduced by differential extinction when employing near-infrared data. This gas is thermally excited. We uncover a rather low H_2 excitation in the DR21 West Peak. The line emission cannot be produced from single C-shocks or J-shocks; a range of shock strengths is required. This suggests that bow shocks and/or bow-generated supersonic turbulence is responsible. We are able to distinguish this shock-excited gas from the fluoresced gas detected in the K band, providing support for the dual-excitation model of Fernandes, Brand & Burton.

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