Cosmic X-Ray background and Earth albedo spectra with swift bat

M. Ajello*, J. Greiner, G. Sato, D. R. Willis, G. Kanbach, A. W. Strong, R. Diehl, G. Hasinger, N. Gehrels, C. B. Markwardt, J. Tueller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

158 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)666-677
Number of pages12
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 2008 Dec 20


  • Cosmology: observations
  • Diffuse radiation
  • Earth
  • Galaxies: active
  • X-rays: diffuse background

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics


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