Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5404c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #54.04; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
With its ability to do deep all-sky monitoring and with its extended hard X-ray energy response, EXIST will be an ideal partner for ground-based and space-based gamma-ray telescopes such as HESS, VERITAS, and GLAST. Simultaneous gamma-ray/EXIST observations of blazars will place strong constraints on the emission mechanisms and physical conditions in blazars, which have proven more complex and extreme than previously thought. If we can understand in detail the origin of blazar emission, we should be able to predict a blazar's intrinsic gamma-ray spectrum. Knowing this spectrum has important implications for cosmology since sufficiently energetic gamma-rays pair can produce on the cosmic infrared background and are effectively absorbed. A comparison of a blazar's observed and intrinsic spectrum constrains the amount of absorption that occurred, ie., it limits the intensity of the cosmic infrared background which in turn constrains when and how much star formation activity occurred in the universe.
Coppi Paolo S.
EXIST Science Team
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