X-Ray Search for Missing Baryon

Details X-Ray Search for Missing Baryon X-Ray Search for Missing Baryon

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..712o&link_type=abstract

Chandra Proposal ID #02900778

Physics

Chandra Proposal Id #02900778

Scientific paper

We propose the Chandra observation to search for a shadow in the soft X-ray background cast by the disk of the nearby spiral galaxy NGC 55. By virtue of the high spatial resolution of Chandra, we can remove discrete sources efficiently. With 60 ksec observation, we can obtain a meaningful constraint on the amount of diffuse extragalactic soft X-ray background below 1 keV. This will provide a strong test of the theoretical prediction that a large amount of baryonic matter is in a form of hot gas and is missing at present-day universe.

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