Small Angle X-ray Scattering and Halos from Dust

Details Small Angle X-ray Scattering and Halos from Dust Small Angle X-ray Scattering and Halos from Dust

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.a1209s&link_type=abstract

American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #A12.09

Physics

Scientific paper

X-rays emitted from a point source will scatter very slightly when passing through the interstellar medium, due to photon-electron interactions. When an X-ray passes through a dust particle, this scattering can be greatly intensified for small (few arcminute) angles by the combined effect of all the electrons in the dust, thereby creating a ``halo'' around x-ray point sources. Efforts to model these halos have used the Rayleigh-Gans approximation, which effectively assumes each electron is an equally-effective scattering site, independent of position. We show that for E_X-ray <= 1 keV, the Rayleigh-Gans approximation breaks down for interstellar dust. However, Mie scattering theory can be used instead, extending the validity of these calculations to softer X-ray observations. This extended model is used to analyze ROSAT observations of a soft (0.5 keV) x-ray halo around Nova Cygni 1992.

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