Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.3202a&link_type=abstract
American Astronomical Society, HEAD meeting #10, #32.02
Astronomy and Astrophysics
Astronomy
Scientific paper
We use the Swift/BAT instrument to derive an accurate measurement of the Cosmic X-ray Background (CXB) and of the Earth's albedo spectra in the 15-150 keV energy band. Our measurement takes advantage of several episodes of occultation of the BAT field of view caused by the Earth. The modulation of the CXB signal caused by the Earth passages can be used to measure the CXB spectrum. We use a limb-brightening rigidity-dependent Earth emission model to deconvolve the CXB and the albedo spectra without any assumption on their spectra. The main result is that both spectra are the most accurate measurements in this energy range.
The BAT CXB spectrum confirms with great accuracy the HEAO-1 measurement, thus posing tight constraints on the space density of local Compton-thick AGN. The BAT albedo spectrum is the only high-significance measurement at these energies and it can be used by future mission to predict the level of the orbital photon background. Both spectra will be discussed in comparison with previous measurements. We will also discuss the most recent results from the BAT survey which are related to the generation and understanding of the CXB emission.
Ajello Marco
Diehl Roland
Gehrels Neil
Greiner Jochen
Markwardt Craig B.
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