W50 - A stellar-wind bubble in a three-phase interstellar medium?

Details W50 - A stellar-wind bubble in a three-phase interstellar medium? W50 - A stellar-wind bubble in a three-phase interstellar medium?

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205..471k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Nov. 1983, p. 471-485.

Astronomy and Astrophysics

Astronomy

29

Interstellar Matter, Nebulae, Stellar Winds, Radio Sources (Astronomy)

Scientific paper

The interaction between the relativistic jets of SS433 and the radio nebula W50 is analysed on the basis of recent observations. It is found that SS433 may be surounded by a cloudy interstellar medium, of the type described by the three-phase model of McKee & Ostriker. In addition, it is concluded that W50 is more likely to represent an expanding interstellar bubble, driven by a strong stellar wind from the binary companion of SS433, than a supernova remnant. It is argued that the dynamics of the expansion is probably controlled by the inertia of evaporated interstellar clouds within the bubble. Among the observed features which find a natural explanation in this picture are the spatial distribution of the diffuse X-ray emission, the sphericity of the radio shell and the asymmetry of its eastern and western extensions, the concentration of the line-emitting filaments near the radio shell, and the appearance of blue wings in the optical line profiles. This interpretation can be incorporated into a self-consistent evolutionary scenario in which the formation of SS433 is attributed to a supernova explosion in the galactic plane.

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