Observational aspects of X-ray halos

Details Observational aspects of X-ray halos Observational aspects of X-ray halos

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jbis...28..319s&link_type=abstract

British Interplanetary Society, Journal, vol. 28, May 1975, p. 319-325.

Statistics

Computation

3

Cosmic Dust, Halos, Interstellar Matter, X Ray Scattering, X Ray Sources, Angular Distribution, Astronomical Models, Distance, Particle Size Distribution, Scattering Cross Sections, Time Dependence

Scientific paper

It is shown that, within certain restrictions, observations of X-ray halo time histories can be used to derive the distance of an X-ray source, the grain size spectrum, and the dust density distribution along the line of sight. Using a model with spherical grains and singly scattered photons of a certain wavelength, equations are derived for the time-dependent halo, the non-normalized grain size distribution, the effective scattering cross section for a given scattering angle, and the source distance. Two computations of halo histories are presented for a model X-ray source similar to Cyg X-1.

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