Computer Science
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257..935p&link_type=abstract
Science (ISSN 0036-8075), vol. 257, no. 5072, Aug. 14, 1992, p. 935-937.
Computer Science
5
Galactic Bulge, Halos, Lunar Occultation, Rosat Mission, X Ray Scattering, X Ray Sources, Brightness Distribution, Cosmic Dust, Interstellar Matter, Proportional Counters
Scientific paper
The X-ray source GX 5-1 in the Galactic bulge was observed with the position-sensitive proportional counter onboard ROSAT during and after a lunar occultation. Extended emission around the source was unambiguously discovered while the central source was behind the lunar rim. This emission is interpreted as a dust-scattering halo around GX 5-1 that has a fractional intensity of 28 percent, implying a grain column density between GX 5-1 and earth of approximately 3 x 10 exp 10/sq cm. The halo derived from imaging the ROSAT all-sky survey is identical to that obtained from the lunar occultation, thus demonstrating that the ROSAT X-ray mirror scattering has not changed as compared with the mirror properties as measured in preflight calibrations.
Predehl Peter
Schmitt Juergen H. M. M.
Snowden Steven L.
Truemper Joachim
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