2026-04-13T01:40:29Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1275462025-12-05T16:11:33Zcom_2072_1057col_2072_478904col_2072_478917

Non-Gaussian halo assembly bias Reid, Beth A. Verde, Licia Dolag, Klaus Matarrese, Sabino Moscardini, Lauro Cosmologia Astrofísica Cosmology Astrophysics The strong dependence of the large-scale dark matter halo bias on the (local) non-Gaussianity parameter, fNL, offers a promising avenue towards constraining primordial non-Gaussianity with large-scale structure surveys. In this paper, we present the first detection of the dependence of the non-Gaussian halo bias on halo formation history using N-body simulations. We also present an analytic derivation of the expected signal based on the extended Press-Schechter formalism. In excellent agreement with our analytic prediction, we find that the halo formation history-dependent contribution to the non-Gaussian halo bias (which we call non-Gaussian halo assembly bias) can be factorized in a form approximately independent of redshift and halo mass. The correction to the non-Gaussian halo bias due to the halo formation history can be as large as 100%, with a suppression of the signal for recently formed halos and enhancement for old halos. This could in principle be a problem for realistic galaxy surveys if observational selection effects were to pick galaxies occupying only recently formed halos. Current semi-analytic galaxy formation models, for example, imply an enhancement in the expected signal of ~ 23% and ~ 48% for galaxies at z = 1 selected by stellar mass and star formation rate, respectively. 2019-01-23T10:54:01Z 2019-01-23T10:54:01Z 2010 2019-01-23T10:54:01Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2010/07/013 Journal of Cosmology and Astroparticle Physics, 2010, vol. 2010, num. 013 https://doi.org/10.1088/1475-7516/2010/07/013 info:eu-repo/grantAgreement/EC/FP7/240117/EU//PHYS.LSS (c) IOP Publishing and Sissa Medialab, 2010 info:eu-repo/semantics/openAccess Institute of Physics (IOP) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))