Scattering of Cosmic X-Rays by Interstellar Dust Grains

Details Scattering of Cosmic X-Rays by Interstellar Dust Grains Scattering of Cosmic X-Rays by Interstellar Dust Grains

May 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970pthph..43.1224h&link_type=abstract

Progress of Theoretical Physics, Vol. 43, No. 5, pp. 1224-1230

Physics

59

Scientific paper

X-rays from celestial sources are scattered by interstellar dust grains. The apparent angular size of an X-ray source increases due to scattering, depending on the distance of the X-ray source, the wavelength of X-rays and the properties of dust grains. Hence the observation of the scattering effect provides a new means of obtaining the distances of X-ray sources and various pieces of information on interstellar dust grains. Since the angular size is proportional to λ / a, where λ is the wavelength of X-rays and a the radius of grains, the observation of the scattering effect is feasible at wavelengths greater than 10 Å. It is suggested that the wavelength slightly longer than the K-edge of oxygen is most advantageous, if silicate or silicate-ice mantle is the major component of interstellar dust grains.

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