Astron. Astrophys. 357, 1031-1034 (2000)

Bow-shocks and possible jet-shell interaction in the planetary nebula M 2-48

R. Vázquez ¹, L. López-Martín ², L.F. Miranda ³, C. Esteban ⁴, J.M. Torrelles ⁵, L. Arias ² and A.C. Raga <sup>2

1</sup> Instituto de Astronomía, UNAM, Km 103 Carretera Tijuana-Ensenada, 22860 Ensenada, B.C., Mexico (vazquez@astrosen.unam.mx)
² Instituto de Astronomía, UNAM, Circuito de la Investigación Científica, 06510 Cd. Universitaria, D.F., Mexico (luislm,lorena,raga@astroscu.unam.mx)
³ Instituto de Astrofísica de Andalucía, CSIC, c/Sancho Panza s/n, 18008 Granada, Spain (lfm@iaa.es)
⁴ Instituto de Astrofísica de Canarias, c/Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain (cel@ll.iac.es)
⁵ Institut d'Estudis Espacials de Catalunya and Instituto de Ciencias del Espacio (CSIC), Edifici Nexus, C/ Gran Capitá 2-4, 08034 Barcelona, Spain (torrelles@ieec.fcr.es)

Received 12 January 2000 / Accepted 27 March 2000

Abstract

Deep narrow band CCD images in the H, [OIII ] Å, [NII ] Å, and [SII ] Å emission lines have been obtained for the planetary nebula M 2-48. The discovery of a pair of symmetric low-excitation bow-shocks, separated by , and forming a highly collimated bipolar outflow, is presented. The bow-shocks are emitting in [OIII ] and present the ionization structure expected from working surfaces of collimated jets, pointing out that these structures are tracing regions with shocked gas at high velocities ( km s^-1). In addition, an internal bipolar outflow () and an apparent off-center semi-circular shell (size ) are also detected. An enhancement of low-excitation line emission is observed in the shell along the outflow axis. This result can be interpreted in terms of a jet-shell interaction.

Key words: ISM: jets and outflows ISM: planetary nebulae: individual: M 2-48

Send offprint requests to: Roberto Vázquez

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Contents

• 1. Introduction
• 2. Observations and results
• 3. Discussion
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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