Are jets rotating at the launching?

Abstract

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).

to be published in Astrophysical Outflows and Associated Accretion Phenomena, eds. E. M. de Gouveia Dal Pino, A. Raga (IUA JD 7 at the XXVIIth IAU General Assembly). Proceedings: IAU Highlights of Astronomy, Editor-in-Chief: I. F Corbett

References in corpus (5)

• On the origin of radio emission in radio quiet quasars
• Rotation and Outflow motions in the very low-mass Class 0 protostellar system HH 211 at subarcsecond resolution
• Submillimeter arcsecond-resolution mapping of the highly collimated protostellar jet HH 211
• Interpreting a Dwarf Nova Eruption as Magnetic Flare Activity
• The role of thermal pressure in jet launching

Cited by in corpus (3)

• The reflection-symmetric wiggle of the young protostellar jet HH 211
• A twin-jet structure rather than jet-rotation in the young stellar object OMC 2/FIR 6b
• Multi-jets structure rather than rotation of the NGC 1333 IRAS 4A2 protostellar jets