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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421596.0, MPI für Astronomie / Publikationen_mpia
Observational 2D model of H2 emission from a bow shock in the Orion Molecular Cloud
Authors:Kristensen, L. E.; Ravkilde, T. L.; Pineau Des Forêts, G.; Cabrit, S.; Field, D.; Gustafsson, M.; Diana, S.; Lemaire, J. L.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Astronomy and Astrophysics
Start Page:203
End Page:211
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 mum, v= 1-0 S(0) at 2.23 mum and v= 2-1 S(1) at 2.25 mum. 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.
Free Keywords:ISM: individual objects: OMC1; ISM: kinematics and; dynamics; ISM: molecules; shock waves; ISM: lines and bands
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008A%26A...477..203... [ID No:1]
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