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Free accessOther version: http://mnras.oxfordjournals.org/cgi/doi/10.1093/mnras/stu680
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Scientific Article
unige:40532 
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Measuring non-local Lagrangian peak bias |
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| Authors | ||
| Published in | Monthly Notices of the Royal Astronomical Society. 2014, vol. 441, no. 2, p. 1457-1467 | |
| Abstract | We investigate nonlocal Lagrangian bias contributions involving gradients of the linear density field, for which we have predictions from the excursion set peak formalism. We begin by writing down a bias expansion which includes all the bias terms, including the nonlocal ones. Having checked that the model furnishes a reasonable fit to the halo mass function, we develop a 1-point cross-correlation technique to measure bias factors associated with 2-distributed quantities. We validate the method with numerical realizations of peaks of Gaussian random fields before we apply it to N-body simulations. We focus on the lowest (quadratic) order nonlocal contributions. We can reproduce our measurement of chi_{10} if we allow for an offset between the Lagrangian halo center-of-mass and the peak position. The sign and magnitude of chi_{10} is consistent with Lagrangian haloes sitting near linear density maxima. The resulting contribution to the halo bias can safely be ignored for M = 10^13 Msun/h, but could become relevant at larger halo masses. For the second nonlocal bias chi_{01} however, we measure a much larger magnitude than predicted by our model. We speculate that some of this discrepancy might originate from nonlocal Lagrangian contributions induced by nonspherical collapse. | |
| Keywords | Cosmology: theory — Dark matter — Large-scale structure of Universe | |
| Identifiers | DOI: 10.1093/mnras/stu680 | |
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Article (Published version) (1 MB) - Free access Other version: http://mnras.oxfordjournals.org/cgi/doi/10.1093/mnras/stu680 |
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| Structures | ||
| Citation (ISO format) | BIAGETTI, Matteo et al. Measuring non-local Lagrangian peak bias. In: Monthly Notices of the Royal Astronomical Society, 2014, vol. 441, n° 2, p. 1457-1467. https://archive-ouverte.unige.ch/unige:40532 |
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