Detecting Emission from the Missing Baryons Through X-Ray Shadowing

Details Detecting Emission from the Missing Baryons Through X-Ray Shadowing Detecting Emission from the Missing Baryons Through X-Ray Shadowing

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..115b&link_type=abstract

XMM-Newton Proposal ID #05538801

Physics

Cosmology, Extragalactic Deep Fields And Area Surveys, Ngc4244, Xmm-Newton Proposal Id #05538801

Scientific paper

The majority of the baryons in the present-day universe are "missing" in that they are not in galaxies or as cool intergalactic gas. These baryons are most likely diffuse gas at 1E5 - 1E7 K in regions of modest overdensity, and the superposition of many such regions produces X-ray emission that accounts for about 5-20% of the X-ray background in the 0.2-1 keV range. To detect this emission, we propose to use the shadowing properties of the extended gas in the edge-on galaxy NGC 4244. This gas will absorb some of the background emission, leading to a local minimum in the soft X-ray background (a shadow).

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