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Jets in extragalactic radio sources.

D S De Young

    Science (New York, N.Y.)
    |August 17, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Giant extragalactic radio sources require continuous energy. Observations suggest slow-moving, cool gas jets, not relativistic speeds, explain their properties.

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    Astrophysical jets.

    Science (New York, N.Y.)ยท1991
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    Area of Science:

    • Astrophysics
    • Extragalactic Astronomy
    • Cosmic Jets

    Background:

    • Giant extragalactic radio sources necessitate a constant energy supply.
    • Energy input is theorized to originate from galactic and quasi-stellar object centers via gas streams or jets.

    Purpose of the Study:

    • To investigate the speed and composition of jets emanating from extragalactic radio sources.
    • To reconcile observed jet properties with theoretical models.

    Main Methods:

    • Analysis of observational data at optical and radio wavelengths.
    • Comparison of observed jet characteristics with models of slow-moving, turbulent jets.

    Main Results:

    • Large-scale jet structures are found to move at non-relativistic speeds.

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  • Slow-moving jets with turbulent interiors and cool gas composition accurately predict observed jet properties.
  • The motion of extremely small-scale jets near the energy source remains uncertain.

    • Conclusions:

    • The properties of extragalactic radio source jets are best explained by slow-moving, turbulent gas flows.
    • Previous assumptions of relativistic speeds for large-scale jets are challenged.
    • Further investigation is needed for small-scale jets near central energy sources.