Ponente
Descripción
We present an ongoing tomographic analysis of cosmological constraints from the magnification bias of high-redshift submillimetre galaxies. Building on previous studies, we revisit the cross-correlation between foreground GAMA galaxies and background H-ATLAS sources using an improved modelling and analysis pipeline within a halo-model framework. The analysis explores ΛCDM, wCDM and CDM cosmologies, jointly constraining cosmological and halo occupation distribution parameters. In this new implementation, the foreground sample is divided into three optimized redshift bins in order to improve the statistical performance of the measurement. Preliminary results are consistent with ΛCDM and show tighter constraints on dark-energy parameters and with respect to previous tomographic analyses. Additional improvements to the random catalogue estimation based on KDE methods are currently under development. Although current submillimetre samples are still limited by statistics, this work highlights the potential of magnification bias as a complementary cosmological probe and motivates future wide-area submillimetre surveys, such as AtLAST, which could significantly improve its constraining power.