Is the cosmic UV background fluctuating at redshift z ~ 6 ?

Details Is the cosmic UV background fluctuating at redshift z ~ 6 ? Is the cosmic UV background fluctuating at redshift z ~ 6 ?

2006-05-24

arxiv.org/abs/astro-ph/0605614v1

Astrophys.J. 645 (2006) L1-L4

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figs, accepted by ApJL

Scientific paper

10.1086/506149

We study the Gunn-Peterson effect of the photo-ionized intergalactic medium(IGM) in the redshift range 5< z <6.4 using semi-analytic simulations based on the lognormal model. Assuming a rapidly evolved and spatially uniform ionizing background, the simulation can produce all the observed abnormal statistical features near redshift z ~ 6. They include: 1) rapidly increase of absorption depths; 2) large scatter in the optical depths; 3) long-tailed distributions of transmitted flux and 4) long dark gaps in spectra. These abnormal features are mainly due to rare events, which correspond to the long-tailed probability distribution of the IGM density field, and therefore, they may not imply significantly spatial fluctuations in the UV ionizing background at z ~ 6.

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