English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

An analytical framework is presented to understand the effects of afluctuating intensity of the cosmic ionising background on the correlations ofthe Ly{\alpha} forest transmission fraction measured in quasar spectra. In theabsence of intensity fluctuations, the Ly{\alpha} power spectrum should havethe expected cold dark matter power spectrum with redshift distortions in thelinear regime, with a bias factor b_{\delta} and a redshift distortionparameter {\beta} that depend on redshift but are independent of scale. Theintensity fluctuations introduce a scale dependence in both b_{\delta} and{\beta}, but keeping their product b_{\delta}{\beta} fixed. Observations of theLy{\alpha} correlations and cross-correlations with radiation sources likethose being done at present in the BOSS survey of SDSS-III (Busca et al. 2013;Slosar et al. 2013; Font-Ribera et al. 2014) have the potential to measure thisscale dependence, which reflects the biasing properties of the sources andabsorbers of the ionising background. We also compute a second term affectingthe Ly{\alpha} spectrum, due to shot noise in the sources of radiation. Thisterm is very large if luminous quasars are assumed to produce the ionisingbackground and to emit isotropically with a constant luminosity, but should bereduced by a contribution from galaxies, and by the finite lifetime andanisotropic emission of quasars.

On the effect of the ionising background on the Ly{\alpha} forest autocorrelation function