|
The distribution of cool gas in the local interstellar medium
Bob Warwick (Leicester)
We use ROSAT EUV and soft X-ray absorption data for
nearby late-type and white dwarf stars, combined with distance
measurements from Hipparcos, to chart the distribution of cool gas
(largely HI + HeI + HeII) within 500 pc of the Sun. The ~2000
stars in our sample give improved definition of the shape of the local
cavity. Comparison with recent 1/4 keV soft X-ray background measurements
also constrains the volume emissivity of the local very hot component
of the ISM.
|