Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.258...89p&link_type=abstract
Astrophysics and Space Science, v. 258, Issue 1/2, p. 89-95 (1997).
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
The interaction of X-rays with interstellar dust leads to small angle scattering. X-ray sources behind sufficiently dense dust columns are therefore surrounded by haloes of faint and diffuse X-ray emission. Since these X-ray sources are also highly absorbed, X-ray observations offer the unique opportunity to measure both components of interstellar extinction simultaneously. This method provides an excellent means of determining interstellar gas to dust ratios, a differentiation between interstellar and circumstellar matter, and, last but not least, a clue to the physical nature of dust itself. In particular we have a plausible explanation why the supernova- explosion in Cassiopaea 300 years ago, of which we know today the remnant Cas A, has not been seen. Furthermore, we find that dust grains must be `fluffy' or porous with voids up to 70%.
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