Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..645c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 15, 1983, p. 645-651. Research supported by the Lockheed Independ
Astronomy and Astrophysics
Astrophysics
51
Brightness Distribution, Interstellar Matter, X Ray Imagery, X Ray Scattering, X Ray Sources, Cosmic Dust, Halos, Heao 2, Point Sources, Rayleigh Scattering, X Ray Spectra
Scientific paper
X ray images of distant point sources obtained with the Einstein Observatory have been examined for the presence of halos produced by X-ray scattering from interstellar dust. Evidence for detection of dust halos has been obtained by comparing the apparent surface brightness in images of four low-latitude galactic center sources with the surface brightness predicted from the telescope point response function and the simultaneously measured source spectra. This evidence is considerably strengthened by the same comparison using images of two sources at higher galactic latitude, where the column density of dust is expected to be far lower. Simple assumptions indicate the observed scattering halos are consistent with production by the population of dust grains inferred from optical extinction measurements.
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