Computer Science
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302...46r&link_type=abstract
Nature, vol. 302, Mar. 3, 1983, p. 46-48.
Computer Science
49
Cosmic Dust, Interstellar Matter, X Ray Scattering, X Ray Sources, Brightness Distribution, Halos, Heao 2
Scientific paper
Imaging proportional counter data from the Einstein Observatory are reported for the X ray source GX339-4 (4U1658-48), and the source of the object's halo are discussed. The observations were made in the energy range 0.2-4.0 keV. The instrument's point response function was calculated as a function of the incident X ray energy, detector pulse height channel, and high voltage settings. The scattered flux, i.e., the halo, was proven to exist by comparing the flux in an annulus 3-15 arcmin radius to the total flux in a 15 arcmin radius for the imaged data and the calculated point response function. The results indicate a point source is probable, with the excess in flux due to X rays scattered in interstellar dust. The entire configuration was modeled as a cylindrically symmetrical uniform distribution of spheroidal grains about a constant source, and halo characteristics were computed.
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