Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-23T15:28:07.610Z Has data issue: false hasContentIssue false
  • English
  • Français

Shock Chemistry in Bipolar Molecular Outflows

Published online by Cambridge University Press:  25 May 2016

R. Bachiller  and
M. Pérez Gutiérrez
R. Bachiller
Affiliation:
IGN Observatorio Astronómico Nacional, Apartado 1143, E-28800 Alcalá de Henares, Spain
M. Pérez Gutiérrez
Affiliation:
IGN Observatorio Astronómico Nacional, Apartado 1143, E-28800 Alcalá de Henares, Spain

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Chemical studies have a great potential to study the structure and evolution of the bipolar molecular outflows driven by young stellar objects. In this paper, we discuss some very recent mm-wave studies of L 1157, a bipolar molecular outflow driven by a Class 0 protostar. These observations are very useful to illustrate the chemical alterations produced by a violent highly-collimated outflow. Different molecular lines are observed to trace different components of the gas. Some molecules are abundant in the quiescent medium but are not observed in the shock (e.g. C3H2, N2H+, H13CO+, DCO+), whereas some otherwise rare molecules are very enhanced at the shocked region (e.g. SiO, CH3OH, H2CO, HCN, CN, SO, SO2). In addition, we have observed strong gradients in the chemical composition across the outflow blue lobe. We briefly discuss the chemistry of the most important molecules, devoting special attention to the species which are thought to be abundant in interstellar ice mantles.

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. 153 - 162
Copyright
Copyright © Kluwer 1997 

References

Allamandola, L.J., Sandford, S.A., Tielens, A.G.G.M., Herbst, T. 1992, ApJ 399, 134.CrossRefGoogle Scholar
Avery, L. W., Chiao, M. 1996, ApJ 463, 642.Google Scholar
Bachiller, R. 1996, ARAA 34, 111.Google Scholar
Bachiller, R., Liechti, S., Walmsley, C.M., Colomer, F. 1995, A&A 295, L51.Google Scholar
Bachiller, R., Martín-Pintado, J., Fuente, A. 1991, A&A 243, L21.Google Scholar
Bachiller, R., Martín-Pintado, J., Fuente, A. 1993, ApJ 417, L45.CrossRefGoogle Scholar
Bachiller, R., Pérez Gutiérrez, M. 1997, in preparation.Google Scholar
Bernstein, M.P., Sandford, S.A., Allamandola, L.J., Chang, S., Scharberg, M.A. 1995, ApJ 454, 327.Google Scholar
Blake, G.A., van Dishoeck, E.F., Jansen, D.J., Groesbeck, T.D., Mundy, L.G. 1994, ApJ 428, 680.Google Scholar
Blake, G.A., Sandell, G., van Dishoeck, E.F., Groesbeck, T.D., Mundy, L.G., Aspin, C. 1995, ApJ 441, 689.Google Scholar
Bontemps, S., André, P., Terebey, S., Cabrit, S. 1996, A&A 311, 858.Google Scholar
Charnley, S.B. 1997, ApJ, in press.Google Scholar
Chernin, L.M., Masson, C.R., Fuller, G. 1994, ApJ 436, 741.Google Scholar
Davis, J.J., Eisloeffel, J. 1995, A&A 300, 851.Google Scholar
Duley, W.W., Millar, T.J., Williams, D.A. 1980, MNRAS 192, 945.Google Scholar
Dutrey, A., Guilloteau, S., Bachiller, R. 1997, A&A, in press.Google Scholar
Garay, G., Koehnenkamp, I., Rodríguez, L.F. 1996, The ESO Messenger 84, 31.Google Scholar
Gueth, F., Guilloteau, S., Bachiller, R. 1996, A&A 307, 891.Google Scholar
Gueth, F., Guilloteau, S., Dutrey, A., Bachiller, R. 1997, A&A, in press.Google Scholar
Martín-Pintado, J., Bachiller, R., Fuente, A. 1992, A&A 254, 315.Google Scholar
McMullin, J.P., Mundy, L.G., Blake, G.A. 1994, ApJ 437, 305.Google Scholar
Millar, T.J. 1993, in Dust and Chemistry in Astronomy, eds. Millar, T.J. & Williams, D.A. (Kluwer, Dordrecht).Google Scholar
Mikami, H., Tomofumi, U., Yamamoto, S., Saito, S. 1992, ApJ 392, L87.Google Scholar
Pineau des Forêts, G., Roueff, E., Schilke, P., Flower, D. 1993, MNRAS 262, 915.Google Scholar
Sandell, G., Knee, L.B.G., Aspin, C., Robson, I.E., Russell, A.P.G. 1994, A&A 285, L1.Google Scholar
Schmid-Burgk, J., Muders, D. 1995, in Stellar and Circumstellar Astrophysics, eds. Wallerstein, G., Noriega-Crespo, A. (ASP Conf. Ser., San Francisco).Google Scholar
Schutte, W.A., Gerakines, P.A., Geballe, T.R., van Dishoeck, E.F., Greenberg, J.M. 1996, A&A 309, 633.Google Scholar
Tafalla, M., Bachiller, R. 1995, ApJ 443, L37.Google Scholar
Tafalla, M., Bachiller, R. 1997, unpublished observations.Google Scholar
Umemoto, T., Iwata, T., Fukui, Y., Mikami, H., Yamamoto, S., Kamaya, O., Hirano, N. 1992, ApJ 392, L83.Google Scholar
van Dishoeck, E.F., Blake, G.A., Jansen, D.J., Groesbeck, T.D. 1995, ApJ 447, 760.CrossRefGoogle Scholar
Zhang, Q., Ho, P.T.P., Wright, M.C.H., Wilner, D.J. 1995, ApJ 451, L71.Google Scholar