NGC 4244: Shadowing the Extragalactic Soft X-Ray Background

Details NGC 4244: Shadowing the Extragalactic Soft X-Ray Background NGC 4244: Shadowing the Extragalactic Soft X-Ray Background

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..158w&link_type=abstract

Chandra Proposal ID #01900798

Computer Science

Chandra Proposal Id #01900798

Scientific paper

Observing X-ray shadows produced by neutral gas is the most direct way to decompose the soft X-ray background along a line of sight, therefore to tighten fundamental limits on various X-ray source populations and hot gas in the universe. Well-suited for such a shadowing experiment is the gas-rich, edge-on spiral NGC 4244, which is located in a direction of low Galactic X-ray absorption and is exceptionally inactive in star formation. The proposed ACIS observation of the galaxy will enable us to decompose the soft X-ray background in the 0.2-1 keV range into two separate components: Galactic and extragalactic. This decomposition is particularly important because it may provide a unique diagnosis of the thermal and chemical properties of the hot intergalactic medium.

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