Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443..638n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 2, p. 638-647
Astronomy and Astrophysics
Astronomy
9
Astronomical Models, Filaments, Interstellar Matter, Radio Sources (Astronomy), Shock Waves, Supernova Remnants, Synchrotron Radiation, Electron Acceleration, Galactic Bulge, Imagery, Interstellar Magnetic Fields, Milky Way Galaxy, Stellar Mass Ejection, Stellar Winds
Scientific paper
The filamentary synchrotron radio source G359.1-0.2, otherwise known as 'the Snake,' lies close to the center of the Galaxy. We suggest that it is the result of a star trail which intersected the expanding shock of a supernova remnant (SNR). The shock of the SNR traveled preferentially up the trail, accelerating electrons which produce the observed synchrotron radiation. A pressure-balance model for the expansion of the trail into the ambient interstellar medium is used to find values for the wind speed and mass-loss rate of the star that produces such a trail. It is shown that the energy of the SNR shock could supply the energy of the relativistic electrons of the Snake. This model places tight constraints on the expansion of the trail due to the transverse momentum imparted to it by the SNR shock propagating along it. It is found that for the star trail system to last long enough to form the source we observe, the relative parsec-scale motions of the interstellar medium in the vicinity of the Snake must be lower than the measured turbulent velocities. The strongest argument in favor of this model is that it accounts naturally for the high collimation of the Snake.
Le Strange E. T.
Nicholls Jennifer
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