Day 822

Friday.

1501.05520
Halo mass distribution reconstruction across the cosmic web
Zhao, et al

Study the relation between halo mass and its environment from a probabilistic perspective.  Find that halo mass depends not only on local DM density, but also on non-local quantities such as the cosmic web environment and the halo-exclusion effect.  Given these accurate relations, develop the HADRON-code (Halo mAss Distribution ReconstructiON), a technique which permits assigning halo masses to a distribution of haloes in 3d.  This can be applied to the fast production of mock galaxy catalogues, by assigning halo masses, and reproducing accurately the bias for different mass cuts.  The resulting clustering of the halo populations agree well with that drawn from the BigMultiDark N-body simulation: the power spectra are within 1-sigma up to scales of k=0.2 h/Mpc, when using augmented Lagrangian perturbation theory based mock catalogues.  Only the most massive haloes show a larger deviation.  For these, find evidence of the halo-exclusion effect.  A clear improvement is achieved when assigning the highest masses to haloes with a minimum distance separation.  Also compute the 2- and 3-pt correlation functions, and find an excellent agreement with N-body results.  The work represents a quantitative application of the cosmic web classification.  It can have further interesting applications in the multi-tracer analysis of the large-scale structure for future galaxy surveys.

1501.05571
The information content of anisotropic baryon acoustic oscillation scale measurements
Ross, Percival, Manera

Show: measurements mead using either the monopole and quadrupole, or the monopole and mu^2 power-law moment, are optimal for anisotropic BAO measurements, in that they contain all of the available information using two moments, the minimal number required to measure both H(z) and D_A(z).  Test predictions using 600 mock galaxy samples, finding a good match to the analytic predictions.  Results should enable the optimal extraction of information from future galaxy surveys such as eBOSS, DESI and Euclid.