Further Indications against Jet Rotation in Young Stellar Objects
نویسنده
چکیده
I discuss recent observations of asymmetries in Doppler shifts across T Tauri jets, and argue that the observed asymmetric velocity shifts and gradients do not indicate jet rotation. These observations, therefor, cannot be used as a support of a magnetized disk wind. The interaction of the jets with a twisted-tilted (wrapped) accretion disk (or the variable velocity precessing model) accounts better for the observations. Subject headings: accretion, accretion disks — ISM: jets and outflows — stars: pre–main-sequence
منابع مشابه
Interaction of young stellar object jets with their accretion disk ⋆
I reexamine recent observations of velocity profiles across jets blown by young stellar objects, and argue that the observations do not support the interpretation of jets rotating around their symmetry axes. Instead, I propose that the interaction of the jets with a twisted-tilted (wrapped) accretion disk can form the observed asymmetry in the jets’ line of sight velocity profiles. The proposed...
متن کاملEmission lines from rotating proto-stellar jets with variable velocity profiles I. Three-dimensional numerical simulation of the non-magnetic case
Using the Yguazú-a three-dimensional hydrodynamic code, we have computed a set of numerical simulations of heavy, supersonic, radiatively cooling jets including variabilities in both the ejection direction (precession) and the jet velocity (intermittence). In order to investigate the effects of jet rotation on the shape of the line profiles, we also introduce an initial toroidal rotation veloci...
متن کاملThe Stellar-Disk Electric (Short) Circuit: Observational Predictions for a YSO Jet Flow
Abstract We discuss the star-disk electric circuit for a young stellar object (YSO) and calculate the expected torques on the star and the disk. We obtain the same disk magnetic field and star-disk torques as given by standard magnetohydrodynamic (MHD) analysis. We show how a short circuit in the star-disk electric circuit may produce a magnetically-driven jet flow from the inner edge of a disk...
متن کاملRotation and H α Emission Above and Below the Substellar Boundary
I present the results of a multiyear survey of very low mass stars and brown dwarfs, at high spectral resolution. The spectra were gathered with the HIRES echelle at the Keck Observatory. Some of these objects are stellar and others are substellar (or ambiguous). Early indications that such objects can be rapidly rotating but display little Hα emission turn out to be commonly true. This is the ...
متن کاملInvestigating the transport of angular momentum from young stellar objects
Aims. In this pilot study, we examine molecular jets from the embedded Class I sources, HH 26 and HH 72, to search, for the first time, for kinematic signatures of jet rotation from young embedded sources. Methods. High-resolution long-slit spectroscopy of the H2 1−0 S(1) transition was obtained using VLT/ISAAC. The slit was placed perpendicular to the flow direction about 2′′ from the sources....
متن کامل