English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Motivated by the first detections of rotation signatures in the DG Tau jet(Bacciotti et al. 2002), we examine possible biases affecting the relationbetween detected rotation signatures and true azimuthal velocity forself-similar MHD disc winds, taking into account projection, convolution aswell as excitation gradients effects. We find that computed velocity shifts aresystematically smaller than the true underlying rotation curve. When outerslower streamlines dominate the emission, we predict observed shifts increasingwith transverse distance to the jet axis, opposite to the true rotationprofile. Determination of the full transverse rotation profile thus requireshigh angular resolution observations (< 5 AU) on an object with dominant innerfaster streamlines. Comparison of our predictions with HST/STIS observations ofDG Tau clearly shows that self-similar, warm MHD disc wind models with lambda =13 and an outer radius of the disc ~ 3 AU are able to reproduce detectedvelocity shifts, while cold disc wind models (lambda > 50) are ruled out forthe medium-velocity component in the DG Tau jet.Comment: 4 Pages, 4 Figures, to be published in A&

Predicted rotation signatures in MHD disc winds and comparison to DG Tau observations