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The Physical and Chemical Effects of C-Shocks in Molecular Outflows

Published online by Cambridge University Press:  25 May 2016

G. Pineau Des Forêts ,
D.R. Flower  and
J.-P. Chièze
G. Pineau Des Forêts
Affiliation:
DAEC, Observatoire de Paris, F-92195 Meudon Principal Cedex, France
D.R. Flower
Affiliation:
Department of Physics, University of Durham, Durham DH1 3LE UK
J.-P. Chièze
Affiliation:
DSM/DAPNIA/Service d'Astrophysique, CE-Saclay, F-91191 Gif-sur-Yvette Cedex, France

Abstract

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The bow shocks which are observed in jets associated with low-mass star formation probably have C-shock characteristics over at least part of their extent. We show that ion-neutral streaming in C-type shocks can give rise to the release of significant amounts of silicon from the refractory cores of dust grains and hence to the formation of SiO in the gas phase. The computed profiles of SiO emission lines are found to be qualitatively similar to those observed in molecular outflow regions such as L1448. The question of the validity of the stationary-state assumption, adopted in all previous studies of C-shocks in the interstellar medium, is addressed. Time-dependent calculations of the evolution of a C-type shock propagating in low-density gas suggests that steady state is unlikely to be attained under the dynamical conditions in outflows.

Type
II. The Physics and Chemistry of Molecular Outflows
Information
Symposium - International Astronomical Union , Volume 182: Herbig-Haro Flows and the Birth of Low Mass Stars , 1997 , pp. 199 - 212
Copyright
Copyright © Kluwer 1997 

References

Bachiller, R., Martin-Pintado, J. and Fuente, A.(1991) A& A, 243, L21.Google Scholar
Bachiller, R. and Gomez-Gonzalez, J.(1992) A& A Rev., 3, 257.Google Scholar
Caselli, P., Hartquist, T.W. and Havnes, O.(1997), A& A, in press.Google Scholar
Chièze, J.-P., Pineau des Forêts, G. and Flower, D.R.(1997) MNRAS, to be submitted.Google Scholar
Davis, C.J. and Eisloeffel, J.(1995) A& A 300, 851.Google Scholar
Draine, B.T.(1980) Ap.J. 241, 1021.Google Scholar
Draine, B.T.(1995) Ap. Sp. Sci. 233, 111.Google Scholar
Draine, B.T. and Salpeter, E.E.(1979) Ap.J. 231, 438.Google Scholar
Draine, B.T., Roberge, W.G. and Dalgarno, A.(1983) Ap.J. 264, 485.Google Scholar
Eckstein, W.(1991) Computer Simulation of Ion-Solid Interactions, Springer-Verlag, Berlin.Google Scholar
Field, D., May, P.W., Pineau des Forêts, G. and Flower, D.R.(1997) MNRAS, 285, 839.Google Scholar
Fitzpatrick, E.L.(1996) Ap.J. 473, L55.Google Scholar
Flower, D.R. and Pineau des Forêts, G.(1994) MNRAS 268, 724.Google Scholar
Flower, D.R. and Pineau des Forêts, G.(1995) MNRAS 275, 1049.Google Scholar
Flower, D.R., Pineau des Forêts, G., Field, D. and May, P.W.(1996) MNRAS 280, 447.Google Scholar
Gredel, R.(1994) A& A 292, 580.Google Scholar
Gredel, R.(1996) A& A 305, 582.Google Scholar
Herbst, E., Millar, T.J., Wlodek, S. and Bohme, D.K. (1989) A& A 222, 205.Google Scholar
Jones, A.P., Tielens, A.G.G.M., Hollenbach, D.J. and McKee, C.F.(1994) Ap.J. 433, 797.Google Scholar
Jones, A.P., Tielens, A.G.G.M. and Hollenbach, D.J.(1996) Ap.J. 469, 740.Google Scholar
Martin-Pintado, J., Bachiller, R. and Fuente, A.(1992) A& A 254, 315.Google Scholar
Mathis, J.S., Rumpl, W. and Nordsieck, K.H. (1977) Ap.J. 217, 425.Google Scholar
McKee, C.F., Hollenbach, D.J., Seab, C.G. and Tielens, A.G.G.M.(1987) Ap.J. 318, 674.Google Scholar
Mullan, D.J.(1971) MNRAS 153, 145.Google Scholar
Richtmyer, R.D.(1957) Difference methods for initial-value problems, Interscience, New York.Google Scholar
Schilke, P., Walmsley, C.M., Pineau des Forêts, G. and Flower, D.R.(1997) A& A, in press.Google Scholar
Seab, C.G. and Shull, J.M.(1983) Ap.J. 275, 652.Google Scholar
Smith, M.D. and Brand, P.W.J.L.(1990) MNRAS 245, 108.Google Scholar
Sofia, U.J., Cardelli, J.A. and Savage, B.D.(1994) Ap.J. 430, 650.Google Scholar
Zhang, Q., Ho, P.T.P., Wright, M.C.H. and Wilner, D.J.(1995) Ap. J. 451, L71.Google Scholar
Ziurys, L.M., Friberg, P. and Irvine, W.M.(1989) Ap.J. 343, 201.CrossRefGoogle Scholar