Cosmic X-ray background and Earth albedo Spectra with Swift/BAT

Details Cosmic X-ray background and Earth albedo Spectra with Swift/BAT Cosmic X-ray background and Earth albedo Spectra with Swift/BAT

2008-08-25

arxiv.org/abs/0808.3377v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal. 38 Pages, 16 Figures, 2 Tables

Scientific paper

10.1086/592595

We use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission in the 15--200 keV band. We compare our CXB spectrum with recent (INTEGRAL, BeppoSAX) and past results (HEAO-1) and find good agreement. Using an independent measurement of the CXB spectrum we are able to confirm our results. This study shows that the BAT CXB spectrum has a normalization ~8(+/-3)% larger than the HEAO-1 measurement. The BAT accurate Earth albedo spectrum can be used to predict the level of photon background for satellites in low Earth and mid inclination orbits.

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