Observational 2D model of H2 emission from a bow shock in the Orion Molecular Cloud

Details Observational 2D model of H2 emission from a bow shock in the Orion Molecular Cloud Observational 2D model of H2 emission from a bow shock in the Orion Molecular Cloud

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...477..203k&link_type=abstract

Astronomy and Astrophysics, Volume 477, Issue 1, January I 2008, pp.203-211

Astronomy and Astrophysics

Astrophysics

5

Ism: Individual Objects: Omc1, Ism: Kinematics And, Dynamics, Ism: Molecules, Shock Waves, Ism: Lines And Bands

Scientific paper

Aims:We present a new method for reproducing high spatial resolution observations of bow shocks by using 1D plane parallel shock models. As an example we analyse one bow shock located in the Orion Molecular Cloud (OMC1). Methods: We use high spatial resolution near-infrared observations of H2 rovibrational emission to constrain shock models. These observations have been made at the ESO-VLT using a combination of the NACO adaptive optics system and infrared camera array and the Fabry-Perot interferometer. Three rovibrational H2 lines have been observed: v= 1-0 S(1) at 2.12 μm, v= 1-0 S(0) at 2.23 μm and v= 2-1 S(1) at 2.25 μm. The spatial resolution is 0.15 arcsec ~ 70 AU. We analyse a single bow shock located in our field, featuring a very well defined morphology and high brightness. Results: One dimensional shock models are combined to estimate the physical properties of pre-shock density, shock velocity and transverse magnetic field strength along the bow shock. We find that the pre-shock density is constant at ~5 × 105 cm-3 and shock velocities lie between ~35 km s-1 in the wings of the shock and ~50 km s-1 at the apex. We also find that the transverse magnetic field is stronger at the apex and weaker further down the wings varying between ~2 and 4 mGauss. Predictions of shock velocity and magnetic field strength agree with previous independent observations.
Based on observations obtained at
the European Southern Observatories, VLT, Chile.

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