Evolution of Supernova Remnant Bubbles in a Warm Diffuse Medium: Survey of Results from One-dimensional Models and Their Impact on Estimates of Interstellar Porosity

Astronomy and Astrophysics – Astronomy

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Ism: Bubbles, Ism: General, Ism: Supernova Remnants

Scientific paper

With straightforward modeling of the late evolution of supernova remnants, including a modest nonthermal contribution to the pressure in the preshock (ambient) gas, we demonstrate that in the solar neighborhood:
1.the porosity induced by the remnant population in a warm intercloud medium (n ˜0.15 cm-3) would not be large (q ≲ 0.2), and
2.the slowly cooling supernova remnant bubbles harbor large populations of the high-stage ions (O VI, N V, and C IV at least), sufficient to explain their mean densities in the galactic plane (though a comparable contribution may derive from OB association bubbles).
With these results it is no longer clear that there is any need for a pervasive phase of hot gas in the interstellar medium, beyond that found within localized disturbances.

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