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Bipolar Molecular Outflows Driven by Hydromagnetic Protostellar Winds.

Matzner, McKee

    The Astrophysical Journal
    |November 7, 1999
    PubMed
    Summary
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    Magnetically collimated protostellar winds create thin shells that match observed bipolar molecular outflows. These features appear across various ambient densities and wind histories.

    Area of Science:

    • Astrophysics
    • Computational astrophysics
    • Star formation

    Background:

    • Protostellar outflows are crucial for understanding star formation.
    • Bipolar molecular outflows exhibit characteristic observational features.
    • The role of magnetic fields in shaping these outflows is an active area of research.

    Purpose of the Study:

    • To investigate the formation and characteristics of shells produced by magnetically collimated protostellar winds.
    • To determine if these simulated shells match observed features in bipolar molecular outflows.
    • To explore the influence of ambient density and wind history on outflow morphology.

    Main Methods:

    • Numerical simulations of protostellar winds with magnetic collimation.
    • Modeling the interaction of winds with ambient material.

    Related Experiment Videos

  • Analysis of simulated shell structures, position-velocity, and mass-velocity relations.

    • Main Results:

    • Magnetically collimated winds sweep ambient material into thin, radiative, momentum-conserving shells.
    • The simulated shell features closely reproduce commonly observed characteristics of bipolar molecular outflows.
    • Typical position-velocity and mass-velocity relations are found in outflows across diverse ambient density distributions and wind time histories.

    Conclusions:

    • Magnetic collimation is a viable mechanism for forming the observed shells in bipolar molecular outflows.
    • The resulting outflow structures are robust to variations in ambient density and wind driving history.
    • This work provides a theoretical framework for interpreting observations of protostellar outflows.