Diffuse X-Ray Emission from the Missing Baryons in the Universe

Details Diffuse X-Ray Emission from the Missing Baryons in the Universe Diffuse X-Ray Emission from the Missing Baryons in the Universe

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..710b&link_type=abstract

Chandra Proposal ID #02900563

Computer Science

Chandra Proposal Id #02900563

Scientific paper

In the low redshift universe, 80-90% of the baryons have not yet been detected and are thought to be diffuse gas at 1E6 - 1E7 K, lying in regions of modest overdensity. Cen and Ostriker calculate that this gas produces diffuse emission that accounts for about 25% of the X- ray background in the 0.45-0.8 keV range. We propose to detect this background through X-ray shadowing against the high column density regions of a compact high velocity cloud, which lies in the Local Group, beyond the Milky Way. If the prediction is correct, the proposed observation will lead to a 6 sigma detection of this background and produce the first clear identification of the majority of baryons in the local universe.

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