SIMBAD references

2002AJ....123..382V - Astron. J., 123, 382-386 (2002/January-0)

Empirical radial dependencies of the energy components in magnetized young stellar objects.

VALLEE J.P.

Abstract (from CDS):

Interstellar gas comes with empirical physical relations governing mean parameters such as the gas density n, diameter D, magnetic field B, and gas line width σ, with the forms <n>~Dc, <B>~<D>p, <B>~<n>k, <σ>~<D>q, and p=ck. Using these results, I derive simple formulae for the energy components in turbulent young stellar objects of Classes 0 and I as a function of clump size D (D<0.5 pc) from empirical fits to observations. Here I find the relative importance of the energy components in molecular clumps, each one of the form <E>~Dx, with x ranging from 0 to 3. Magnetic and gravitational energies are more important for small D (<0.1 pc), while for large D (>0.1 pc) turbulent and gravitational energies become dominant (x=2). In addition, the expected relationship between turbulent width and magnetic field, <σ>~<B>^q/p^, is not steep, and the observational data to date bear this out. Damping scenarios, magnetic field shapes, and ambipolar diffusion relevant to observations are discussed.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - Infrared Radiation - ISM: Clouds - ISM: Magnetic Fields - Stars: Formation

CDS comments: In par. 2 : NGC 2024N:FIR, W3(OH):H2O and B1:S not identified.

Simbad objects: 11

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2002AJ....123..382V and select 'bookmark this link' or equivalent in the popup menu


2019.12.06-02:03:20

© Université de Strasbourg/CNRS

    • Contact