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

We present a measurement of the DLA mean bias from the cross-correlation ofDLA and the Ly$\alpha$ forest, updating earlier results of Font-Ribera et al.2012 with the final BOSS Data Release and an improved method to addresscontinuum fitting corrections. Our cross-correlation is well fitted by lineartheory with the standard $\Lambda CDM$ model, with a DLA bias of $b_{\rm DLA} =1.99\pm 0.11$; a more conservative analysis, which removes DLA in the Ly$\beta$forest and uses only the cross-correlation at $r> 10{\rm h^{-1}\,Mpc}$, yields$b_{\rm DLA} = 2.00\pm 0.19$. This assumes the cosmological model from\cite{Planck2015} and the Ly$\alpha$ forest bias factors of Bautista et al.2017, and includes only statistical errors obtained from bootstrap analysis.The main systematic errors arise from possible impurities and selection effectsin the DLA catalogue, and from uncertainties in the determination of theLy$\alpha$ forest bias factors and a correction for effects of high columndensity absorbers. We find no dependence of the DLA bias on column density orredshift. The measured bias value corresponds to a host halo mass $\sim4\cdot10^{11} {\rm M_{\odot}}$ if all DLA were hosted in halos of a similarmass. In a realistic model where host halos over a broad mass range have a DLAcross section $\Sigma(M_h) \propto M_h^{\alpha}$ down to $M_h > M_{\rm min}=10^{8.5} {\rm M_{\odot}}$, we find that $\alpha > 1$ is required to have$b_{\rm DLA}> 1.7$, implying a steeper relation or higher value of $M_{\rmmin}$ than is generally predicted in numerical simulations of galaxy formation.

The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest