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Astronomy & Astrophysics manuscript no. hh240 March 11, 2004 (DOI: will be inserted by hand later)
 

Summary: Astronomy & Astrophysics manuscript no. hh240 March 11, 2004
(DOI: will be inserted by hand later)
A near­infrared study of the bow shocks within the L1634
protostellar outflow
B. O'Connell 1,2 , M.D. Smith 1 , C.J. Davis 3 , K.W. Hodapp 4 , T. Khanzadyan 5 , and T. Ray 6
1 Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland, UK
2 Physics Department, Trinity College Dublin, College Green, Dublin 2, Ireland
3 Joint Astronomy Centre, 660 N.A'ohoku Place, University Park, Hilo, Hawaii 96720, USA
4 Institute for Astronomy, University of Hawaii, 640 N.A'ohoku Place, University Park, Hilo, Hawaii 96720, USA
5 Max­Planck Institut f˜ur Astronomie, K˜onigstuhl 17, D­69117 Heidelberg, Germany
6 School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
Received ...... / Accepted ........
Abstract. The L1634 bright­rimmed globule contains an intriguing arrangement of shock structures: two series of aligned
molecular shock waves associated with the Herbig­Haro flows HH 240 and HH 241. We present near­infrared spectroscopy
and narrow­band imaging in the (1,0) S(1) and (2,1) S(1) emission lines of molecular hydrogen. These observations yield the
spatial distributions of both the molecular excitation and velocity, which demonstrate distinct properties for the individual bow
shocks. Bow shock models are applied, varying the shock physics, geometry, speed, density and magnetic field properties to fit
two prominent bow shocks. The models predict that both bows move at 60 # to the plane of the sky. High magnetic fields and
low molecular fractions are implied. The advancing compact bow HH 240C is interpreted as a J­type bow (frozen­in magnetic
field) with the flanks in transition to C­type (field di#usion). It is a paraboloidal bow of speed # 42 km s -1 entering a medium

  

Source: Armagh Observatory

 

Collections: Physics