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Dimming of Supernovae and Gamma-Ray Busts by Compton Scattering and Its Cosmological Implications

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Pengjie Zhang1

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Free electrons deplete photons from Type Ia supernovae through the (inverse) Compton scattering. This Compton dimming increases with redshift and reaches 0.004 mag at z = 1 and 0.01 mag at z = 2. Although far from sufficient to invalidate the existence of dark energy, it can bias constraints on dark energy at a level nonnegligible for future supernova surveys. This effect is correctable and should be incorporated in supernova analysis. The Compton dimming has similar impact on cosmology based on gamma-ray bursts as standard candles.

Subject headings

cosmology: theory; distance scale


Dates

Issue 2 (2008 August 1)

Received 2008 February 17, accepted for publication 2008 April 9



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