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• W4220684987 abstract "Aims. The main goal of this paper is to derive observational constraints on the halo mass fuction (HMF) by performing a tomographic analysis of the magnification bias signal on a sample of background submillimeter galaxies. The results can then be compared with those from a non-tomographic study. Methods. We measure the cross-correlation function between a sample of foreground GAMA galaxies with spectroscopic redshifts in the range $0.1 < z < 0.8$ (and divided up into four bins) and a sample of background submillimeter galaxies from H-ATLAS with photometric redshifts in the range $1.2 < z < 4.0$. We model the weak lensing signal within the halo model formalism and carry out a Markov chain Monte Carlo algorithm to obtain the posterior distribution of all HMF parameters, which we assume to follow the Sheth and Tormen (ST) three-parameter and two-parameter fits. Results. While the observational constraints on the HMF from the non-tomographic analysis are not stringent, there is a remarkable improvement in terms of uncertainty reduction when tomography is adopted. Moreover, with respect to the traditional ST triple of values from numerical simulations, the results from the three-parameter fit predict a higher number density of halos at masses below $10^{12}M_{odot}/h$ at 95% credibility. The two-parameter fit yields even more restricting results, with a larger number density of halos below $10^{13}M_{odot}/h$ and a lower one above $10^{14}M_{odot}/h$, this time at more than 3$sigma$ credibility. Our results are therefore in disagreement with the standard N-body values for the ST fit at 2$sigma$ and 3$sigma$, respectively." @default.
• W4220684987 created "2022-04-03" @default.
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• W4220684987 date "2022-06-01" @default.
• W4220684987 modified "2023-10-01" @default.
• W4220684987 title "Tomography-based observational measurements of the halo mass function via the submillimeter magnification bias" @default.
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• W4220684987 doi "https://doi.org/10.1051/0004-6361/202142949" @default.
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