Abstract
We have observed at 5GHz the T Tau system with high resolution (≲ 0”.1) using the Multi-Element Radio Linked Interferometer (MERLIN) based at Jodrell Bank Both the optical star (T Tau N) and its well-known infrared companion (T Tau S) were detected. The radio emission from T Tau S was found to be roughly extended in the direction of what is thought to be its outflow axis. More importantly we discovered that this radio emission split up into two spatially separated lobes of opposite helicity in the left and right-circular polarization channels. The circularly polarized lobes appear to straddle the star so that the “flow” and the “counterflow” were of opposite helicity. Such observations are the first direct evidence for the presence of magnetic fields in extended outflows that we are aware of. The radio flux appears to be due to gyrosynchrotron emission from mildly relativistic electrons (γ ≈ 2-3). These electrons may have been accelerated in shocks close to the source. Using reasonable assumptions, the inferred magnetic fields strengths are surprisingly large (≳ several gauss) at distances of approximately 10–20 AU from their source. This is consistent with the magnetic fields being part of a collimated flow.
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References
Böhm, K. H. and Solf, J., 1994, ApJ 430, 277
Curiel, S., Rodriguez, L. F., Moran, J. M. and Canto, J., 1993, ApJ 415, 191
Dyck, H. M., Simon, T. and Zuckerman, B., 1982 ApJ 255, L103
Ghez, A. M., Neugebauer, G., Gorham, P. W., Haniff, C. A., Kulkarni, S. R., Matthews, K., Koresko, C. and Beckwith, S., 1991, AJ 102, 2066
Herbst, T. M., Robberto, M. and Beckwith, S. V. W., 1997, Low Mass Star Formation - from Infall to Outflow, Poster Proceedings of IAU Symp. No. 182, eds. F. Malbet & A. Castets, p215
Ghez, A. M., Weinberger, A. J., Neugebauer, G., Matthews, K. and McCarthy, D. W., JR., 1995, AJ 110, 753
Königl, A. and Ruden, S. P., 1993, Protostars and Planets III, eds. Levy, E. & Lunine, J., University of Arizona Press, 641
Ouyed, R., Pudritz, R. E. and Stone, J. M., 1997, Nature, 385, 409
Philips, R. B., Lonsdale, C. J. and Feigelson, E. D., 1993, ApJ 403, L43
Ray, T. P., Muxlow, T. W. B., Axon, D. J., Brown, A., Corcoran, D., Dyson, J. and Mundt, R., 1997, Nature, 385, 415
Schwartz, P. R., Simon, T., Zuckerman, B. and Howell, R.R., 1984, ApJ 280, L23
Skinner, S.L. and Brown, A., 1994, AJ, 107, 1461
Solf, J., Böhm, K. H. and Raga, A. C., 1988, ApJ 334, 229
Wilner, D.J., Reid, M.J., Menten, K.M. and Moran, J.M., 1997, Low Mass Star Formation - from Infall to Outflow, Poster Proceedings of IAU Symp. No. 182, eds. F. Malbet & A. Castets, p193
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Ray, T.P. et al. (1997). Evidence for Magnetic Fields in the Outflow from T Tau S. In: Reipurth, B., Bertout, C. (eds) Herbig-Haro Flows and the Birth of Low Mass Stars. International Astronomical Union / Union Astronomique Internationale, vol 182. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5608-0_39
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DOI: https://doi.org/10.1007/978-94-011-5608-0_39
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