POVEZNICE

Dr. Elisa Costantini
(SRON Netherlands Institute for Space Research, Utrecht)

"Interstellar dust in the X-rays"

Wednesday 15th March, 16:00h, F-201

In this talk I will review the methods and the state of art of the study 
of interstellar dust as seen in the X-rays. X-rays are effectively scattered
by dust grains along the line of sight. The effect is to produce a halo of
diffuse emission around the source. This emission contains precious
information  on the geometry of the dust clouds and the dust size
distribution. Even more powerful is the study of absorption by dust
grains. Spectra of bright background sources are modified by absorption of
intervening dust, producing features that are unique signatures of the
different chemical composition of dust grains. We have recently performed
a large measuring campaign using several Synchrotron facilities in Europe.
Accurate laboratory measurements are essential for a correct
interpretation of spectra of astronomical sources.
 

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