A Shadow of the Diffuse X-Ray Background

Details A Shadow of the Diffuse X-Ray Background A Shadow of the Diffuse X-Ray Background

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.209b&link_type=abstract

Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.

Physics

Extragalactic Diffuse Emission And Surveys

Scientific paper

The majority of baryons in the local universe are expected to lie outside of galaxies, in modest overdensity regions of the universe. This gas is predicted to be 105-107 K and emit X-rays that can contribute significantly to the X-ray background near 0.75 keV. If present, the gas in an edge-on galaxy would absorb this diffuse background emission, causing a shadow. We carried out this test using Chandra observations of the edge-on galaxy NGC 891, and in a gas-rich region defined by high optical extinction, we detect a shadow in the 0.4-1.0 keV band at the 98% confidence level. This shadow corresponds to approximately one-third to one-half of the X-ray background in this energy range at this location. This observation is consistent with theoretical models, which predict a wide range of spatially dependent values for the background.%%

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