New perspectives on the BOSS small-scale lensing discrepancy for the Planck ΛCDM cosmology

ABSTRACT We investigate the abundance, small-scale clustering, and galaxy–galaxy lensing signal of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS). To this end, we present new measurements of the redshift and stellar mass dependence of the lensing properties of the galaxy sample. We a...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2019-10, Vol.488 (4), p.5771-5787
Hauptverfasser: Lange, Johannes U, Yang, Xiaohu, Guo, Hong, Luo, Wentao, van den Bosch, Frank C
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container_start_page 5771
container_title Monthly notices of the Royal Astronomical Society
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creator Lange, Johannes U
Yang, Xiaohu
Guo, Hong
Luo, Wentao
van den Bosch, Frank C
description ABSTRACT We investigate the abundance, small-scale clustering, and galaxy–galaxy lensing signal of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS). To this end, we present new measurements of the redshift and stellar mass dependence of the lensing properties of the galaxy sample. We analyse to what extent models assuming the Planck18 cosmology fit to the number density and clustering can accurately predict the small-scale lensing signal. In qualitative agreement with previous BOSS studies at redshift z ∼ 0.5 and with results from the Sloan Digital Sky Survey, we find that the expected signal at small scales ($0.1 \lt r_{\rm p}\lt 3 \, h^{-1}\, {\rm {Mpc}}$) is higher by $\sim 25{{\ \rm per\ cent}}$ than what is measured. Here, we show that this result is persistent over the redshift range 0.1 < z < 0.7 and for galaxies of different stellar masses. If interpreted as evidence for cosmological parameters different from the Planck cosmic microwave background (CMB) findings, our results imply $S_8 = \sigma _8 \sqrt{\Omega _{\rm m}/ 0.3} = 0.744 \pm 0.015$, whereas S8 = 0.832 ± 0.013 for Planck18. However, in addition to being in tension with CMB results, such a change in cosmology alone does not accurately predict the lensing amplitude at larger scales. Instead, other often neglected systematics like baryonic feedback or assembly bias are likely contributing to the small-scale lensing discrepancy. We show that either effect alone, though, is unlikely to completely resolve the tension. Ultimately, a combination of the two effects in combination with a moderate change in cosmological parameters might be needed.
doi_str_mv 10.1093/mnras/stz2124
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title New perspectives on the BOSS small-scale lensing discrepancy for the Planck ΛCDM cosmology
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