Cosmology with the submillimetre galaxies magnification bias: Proof of concept

Abstract

Context. As recently demonstrated, high-z submillimetre galaxies (SMGs) are the perfect background sample for tracing the mass density profiles of galaxies and clusters (baryonic and dark matter) and their time-evolution through gravitational lensing. Their magnification bias, a weak gravitational lensing effect, is a powerful tool for constraining the free parameters of a halo occupation distribution (HOD) model and potentially also some of the main cosmological parameters. Aims. The aim of this work is to test the capability of the magnification bias produced on high-z SMGs as a cosmological probe. We exploit cross-correlation data to constrain not only astrophysical parameters ($M_{min}$, $M_1$, and $\alpha$), but also some of the cosmological ones (${\Omega }_m$, ${\sigma }_8$, and $H_0$) for this proof of concept. Methods. The measured cross-correlation function between a foreground sample of GAMA galaxies with spectroscopic redshifts in the range 0.2 < z < 0.8 and a background sample of H-ATLAS galaxies with photometric redshifts >1.2 is modelled using the traditional halo model description that depends on HOD and cosmological parameters. These parameters are then estimated by performing a Markov chain Monte Carlo analysis using different sets of priors to test the robustness of the results and to study the performance of this novel observable with the current set of data Results. With our current results, ${\Omega }_m$ and $H_0$ cannot be well constrained. However, we can set a lower limit of >0.24 at 95\% confidence level (CL) on ${\Omega }_m$ and we see a slight trend towards $H_0>70$ values. For our constraints on ${\sigma }_8$ we obtain only a tentative peak around 0.75, but an interesting upper limit of ${\sigma }_8\lesssim 1$ at 95\% CL. We also study the possibility to derive better constraints by imposing more restrictive priors on the astrophysical parameters.

accepted in Astronomy & Astrophysics

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• Quasi-stellar objects and galaxy mass density profiles derived using the submillimetre galaxies magnification bias
• Accurate Measurement of the Lensing Magnification by BOSS CMASS Galaxies and Its Implications for Cosmology and Dark Matter
• Galaxy cluster mass density profile derived using the submillimetre galaxies magnification bias
• Methodological refinement of the submillimeter galaxy magnification bias. II. Cosmological analysis with tomography
• Cosmic Insights from Galaxy Clusters: Exploring Magnification Bias on Sub-millimeter Galaxies
• Methodological refinement of the submillimeter galaxy cross-correlation function measurements and their uncertainty estimation
• Cosmic backgrounds from the radio to the far-infrared: recent results and perspectives from cosmological and astrophysical surveys
• Cosmic magnification on high-redshift submillimeter galaxies