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Several analyses have shown that LCDM-based models cannot jointly describethe clustering (GC) and galaxy-galaxy lensing (GGL) of galaxies in the SDSS-IIIBOSS survey, which is commonly known as the 'lensing-is-low problem'. In thiswork, we show that an extension of Subhalo Abundance Matching, dubbed SHAMe,successfully solves this problem. First, we show that this model accuratelyreproduces the GC and GGL of a mock galaxy sample in the TNG300 hydrodynamicsimulation with analogous properties to BOSS galaxies. Then, we switch ourattention to observed BOSS galaxies at z=0.31-0.43, and we attempt to reproducetheir GC and GGL by evaluating SHAMe on two different simulations: one adoptingbest-fitting cosmological parameters from Planck and the other from weakgravitational lensing surveys (Low S8), where the amplitude of matterfluctuations is lower for the latter. We find excellent agreement between SHAMepredictions and observations for both cosmologies, indicating that thelensing-is-low problem originates from approximations in previous theoreticaldescriptions of the data. The main difference between SHAMe results in thesecosmologies is the level of galaxy assembly bias, which is approximately 20 and10% for Planck and Low S8, respectively. These results highlight the dangers ofemploying oversimplified models to analyse current large-scale structuredatasets, and the need for realistic yet flexible descriptions of thegalaxy-halo connection.

Consistent clustering and lensing of SDSS-III BOSS galaxies with an extended abundance matching formalism