Evidence for the Galactic X-ray Bulge II

Abstract

A mosaic of 5 \ros~PSPC pointed observations in the Galactic plane ($l\sim 25^{\circ }$) 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 $\sim 15$% and $\sim 37$% 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.

19 pages, 5 figures, 2 tables

References in corpus (1)

• Evidence for an X-ray Emitting Galactic Bulge: Shadows Cast by Distant Molecular Gas

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• The Milky Way in Molecular Clouds: A New Complete CO Survey
• The Milky Way's Kiloparsec Scale Wind: A Hybrid Cosmic-Ray and Thermally Driven Outflow
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• Detection of highly ionized O and Ne absorption lines in the X-ray spectrum of 4U1820-303 in the globular cluster, NGC 6624
• ASCA Observation of an "X-ray Shadow" in the Galactic Plane