Are jets rotating at the launching?

Details Are jets rotating at the launching? Are jets rotating at the launching?

2009-09-26

arxiv.org/abs/0909.4847v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

to be published in Astrophysical Outflows and Associated Accretion Phenomena, eds. E. M. de Gouveia Dal Pino, A. Raga (IUA JD

Scientific paper

I argue that the Doppler shift asymmetries observed in some young stellar object (YSO) result from the interaction of the jets with the circumstellar gas, rather than from jets' rotation. The jets do rotate, but at a velocity much below claimed values. During the meeting I carefully examined new claims, and found problems with the claimed jets' rotation. I will challenge any future observation that will claim to detect jet rotation in YSOs that requires the jets (and not a wind) to be launched from radii much larger than the accreting stellar radius. I conclude that the most likely jets' launching mechanism involves a very efficient dynamo in the inner part of the accretion disk, with jets' launching mechanism that is similar to solar flares (coronal mass ejection).

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