2008 Supplement: Frascati Workshop 2007 / Frontera

The Cosmic X-ray Background at the Peak of its Emission: An Accurate Measurement with BeppoSAX and its Consequences

F. Frontera, M. Orlandini, R. Landi, A. Comastri, G. Setti


We discuss an accurate measurement of the CXB in the 15-50 keV range
performed with the Phoswich Detection System (PDS) instrument aboard the
BeppoSAX satellite, whose results have already been recently reported
elsewhere te{Frontera07}. After the recently reported 2-10 keV CXB
measurements obtained with the imaging instruments aboard the X-ray
satellites BeppoSAX, XMM-Newton, and Chandra that give CXB intensities
systematically higher than those obtained with HEAO-1 in the same energy
band, suspects of systematic errors in the HEAO-1 measurements at low
and higher energies have been raised by several authors. Using the
BeppoSAX PDS pointings at high galactic latitude (|b|>15°) we
have measured the CXB spectrum and intensity level in the 15-50 keV
energy band. Our results are consistent with those obtained with HEAO-1
at the same energies. Astrophysical consequences are discussed.


X-rays: diffuse background cosmology: diffuse radiation cosmology: observations

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