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A very straight and collimated outflow in the core of OMC-1

  • J. Schmid-Burgk (a1), R. Güsten (a1), R. Mauersberger (a1), A. Schulz (a1) and T. L. Wilson (a1)...

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We have recently discovered a large-scale (200″) outflow system in the core of OMC-1 (fig. 1), centered about 100″ South of IRc2 and extending over some 120″ (red lobe) resp. 60″ (blue) along a position angle of —31° (Schmid-Burgk et al. 1990). The blue lobe which might actually protrude into the HII region M42 is poorly defined in CO 2-1, but the red lobe reveals a number of remarkable properties which we summarize here:

The outflow is very straight and smooth. Over the full length of 120″, the center of any cross scan deviates by not more than about 1″ from a straight line. This line passes to within 2″ the peak of the submm source FIR4 of OMC-1 (Mezger, Wink and Zylka 1990) and the mm continuum peak CS3 (Mundy et al. 1986); it also cuts across the red and blue SiO-outflow lobes recently discovered some 5-10″ to either side of FIR4 (Ziurys, Wilson and Mauersberger 1990). It thus seems that the “base” of our large-scale CO jet can be seen as well.

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References

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Mezger, P. G., Wink, J. E., Zylka, R. 1990 Astron. Astrophys. 228, 95.
Mundy, L. G., Scoville, N. Z., Baath, L. B., Masson, C. R., Woody, D. P. 1986 Astrophys. J. Lett. 304, L51.
Schmid-Burgk, J., Güsten, R., Mauersberger, R., Schulz, A., Wilson, T. L. 1990 to appear in Astrophys. J. Letters.
Ziurys, L. M., Wilson, T. L., Mauersberger, R. 1990 Astrophys. J. Letters 356, L25.

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