Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911105p&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #111.05; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astrophysics
Scientific paper
It has become increasingly clear that understanding astronomically significant processes at high and low redshift, such as galactic evolution, accretion onto supermassive black holes, star formation, feedback of processed metal-rich material into the ISM and IGM, is not possible without a proper understanding of the physical properties of astrophysical dust.
X-ray observations can provide a detailed picture of the structure of grains in high-energy environments through the detectioncand analysis of X-ray absorption fine structure (XAFS) features which can provide a method for estimating the fraction of crystalline grains. Also, dust particles scatter X-rays, and many such dust scattering halos have been observed around distant Galactic X-ray sources the most remarkable of which is that around Cyg X-3. A spectrum with the Chandra High Energy Transmission Grating Spectrometer (HETGS) of this halo is available and permits a deeper investigation into the geometry, and line-of-sight grain distribution and chemical composition.
Paerels Frederic
Petric Andreea
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