Zhang 2008 自由电子散射对宇宙光子的影响

主要内容:
类似Ia超新星，自由电子的康普顿散射会使得到达观测者的光子数减少。 This Compton dimming increases with redshift and reaches 0.004 mag at $z=1$ and 0.01 mag at $z=2$. 这在宇宙学上可能是需要考虑的现象。

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文章信息:

· arXiv e-print (arXiv:0802.2417)

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Title:		Dimming of supernovae and gamma ray busts by Compton Scattering and its cosmological implications
Authors:		Zhang, Pengjie
Publication:		eprint arXiv:0802.2417
Publication Date:		02/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		3 pages, 3 figures. Submitted to ApJ
Bibliographic Code:		2008arXiv0802.2417Z

Abstract

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 constraint on dark energy at a level non-negligible 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.

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