Evidence for the Galactic X-ray Bulge II

Details Evidence for the Galactic X-ray Bulge II Evidence for the Galactic X-ray Bulge II

1998-07-10

arxiv.org/abs/astro-ph/9807107v1

Astronomy and Astrophysics

Astrophysics

19 pages, 5 figures, 2 tables

Scientific paper

10.1086/306468

A mosaic of 5 \ros~PSPC pointed observations in the Galactic plane ($l\sim25^{\circ}$) reveals X-ray shadows in the $0.5-2.0$ keV band cast by distant molecular clouds. The observed on-cloud and off-cloud X-ray fluxes indicate that $\sim15$% and $\sim37$% of the diffuse X-ray background in this direction in the \tq~keV and 1.5 keV bands, respectively, originates behind the molecular gas which is located at $\sim$3 kpc from the Sun. The implication of the derived background X-ray flux beyond the absorbing molecular cloud is consistent with, and lends further support to recent observations of a Galactic X-ray bulge.

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