Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439..976g&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 439, no. 2, p. 976-982
Astronomy and Astrophysics
Astronomy
5
Cosmic Dust, Halos, Interstellar Extinction, Interstellar Matter, Stellar Envelopes, X Ray Scattering, X Ray Stars, Data Reduction, Instrument Errors, Microchannel Plates, X Ray Astronomy
Scientific paper
Results are presented of an experiment to detect the presence of X-ray scattering by interstellar dust grains in the form of a halo around Sco X-1. We utilize te principle that X-ray scattering off an optical is reduced by 1/sin theta for reflections out of the plane of incidence, thus reducing instrumental scattering off our moderate quality (1 arcminute) X-ray optic. We find an upper limit X-ray flux from Sco X-1 in the form of a halo at a mean energy of 0.69 keV of 7.6% of the point source flux at the 1 sigma confidence level. From this we derive an upper limit of E(B-V) = 0.12 towards Sco X-1. This is about half the value (E(B-V) approximately 0.3) derived toward Sco X-1 using the 2200 A interstellar absorption feature, indicating probable circumstellar origin to the 2200 A feature.
Cash Webster
Gallagher Dennis
Green Jeremy
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