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Soft X-rays from the Cygnus Loop: Interpretation.

W H Tucker

    Science (New York, N.Y.)
    |April 23, 1971
    PubMed
    Summary
    This summary is machine-generated.

    Recent soft X-ray observations of the Cygnus Loop are explained by two models. A synchrotron model requires high-energy electrons, while a hot plasma model suggests a supernova remnant. Both models offer insights into this cosmic phenomenon.

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    Area of Science:

    • Astrophysics
    • Plasma Physics
    • X-ray Astronomy

    Background:

    • The Cygnus Loop is a supernova remnant emitting soft X-rays.
    • Previous observations require interpretation regarding its emission mechanisms.

    Purpose of the Study:

    • To analyze recent soft X-ray observations of the Cygnus Loop.
    • To evaluate two distinct physical models for the observed X-ray emission.

    Main Methods:

    • Analysis of soft X-ray data from the Cygnus Loop.
    • Modeling the emission based on synchrotron radiation.
    • Modeling the emission based on hot plasma radiation.

    Main Results:

    • A synchrotron model necessitates a weak magnetic field (<10^-6 gauss) and extremely high electron energies (>10^14 eV), requiring continuous electron injection for 50,000 years.

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  • The observations are also consistent with a hot plasma model, assuming cosmic elemental abundances.
  • The hot plasma model suggests a supernova blast wave origin, with an estimated kinetic energy release of 6x10^50 ergs for a distance of 770 parsecs.

    • Conclusions:

    • The Cygnus Loop's X-ray emission can be explained by either synchrotron radiation or a supernova-driven hot plasma.
    • The hot plasma model provides a plausible explanation for the observed characteristics, linking it to supernova explosions in the interstellar medium.