Papers › The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the...
The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest
Ignasi Pérez-Ràfols, Andreu Font-Ribera, Jordi Miralda-Escudé, Michael Blomqvist, Simeon Bird, Nicolás Busca, Hélion du Mas des Bourboux, Lluís Mas-Ribas, Pasquier Noterdaeme, Patrick Petitjean, James Rich, Donald P. Schneider
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We present a measurement of the DLA mean bias from the cross-correlation of DLA and the Lyα forest, updating earlier results of Font-Ribera et al. 2012 with the final BOSS Data Release and an improved method to address continuum fitting corrections. Our cross-correlation is well fitted by linear theory with the standard ΛCDM model, with a DLA bias of b_(DLA) = 1.99±0.11; a more conservative analysis, which removes DLA in the Lyβ forest and uses only the cross-correlation at r> 10h⁻¹ Mpc, yields b_(DLA) = 2.00±0.19. This assumes the cosmological model from \cite{Planck2015} and the Lyα 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 effects in the DLA catalogue, and from uncertainties in the determination of the Lyα forest bias factors and a correction for effects of high column density absorbers. We find no dependence of the DLA bias on column density or redshift. The measured bias value corresponds to a host halo mass ∼4·10¹¹ M_⊙ if all DLA were hosted in halos of a similar mass. In a realistic model where host halos over a broad mass range have a DLA cross section Σ(Mₕ) ∝Mₕ^α down to Mₕ > Mₘᵢₙ =10^(8.5) M_⊙, we find that α> 1 is required to have b_(DLA)> 1.7, implying a steeper relation or higher value of Mₘᵢₙ than is generally predicted in numerical simulations of galaxy formation.
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