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Issue A&A
Volume 423, Number 2, August IV 2004
Page(s) L21 - L24
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400015



A&A 423, L21-L24 (2004)
DOI: 10.1051/0004-6361:200400015

Letter

A highly collimated, extremely high velocity outflow in Taurus

M. Tafalla1, J. Santiago1, D. Johnstone2 and R. Bachiller1

1  Observatorio Astronómico Nacional (IGN), Alfonso XII 3, 28014 Madrid, Spain
    e-mail: m.tafalla@oan.es
2  NRC Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada

(Received 4 June 2004 / Accepted 2 July 2004 )

Abstract
We present the first case of a highly collimated, extremely high velocity bipolar outflow in Taurus. It is powered by the low-luminosity (0.4  $L_\odot$) source IRAS 04166+2706 and contains gas accelerated up to 50 km s -1 with respect to the ambient cloud both toward the blue and the red (uncorrected for projection). At the highest velocities, the outflow collimation factor exceeds 20, and the gas displays a very high degree of spatial symmetry. This very fast gas presents multiple maxima, and most likely arises from the acceleration of ambient material by a time-variable jet-like stellar wind. When scaled for luminosity, the outflow parameters of IRAS 04166 are comparable to those of other extremely high velocity outflows like L1448, indicating that even the very quiescent star-formation mode of Taurus can produce objects powering very high energy flows ( $L_{\rm mec}/L_* > 0.15$).


Key words: jets -- young stellar object

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© ESO 2004


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