MNRAS-2009-Desjacques-85-96.pdf (888.46 kB)
Scale-dependent bias induced by local non-Gaussianity: a comparison to N-body simulations
journal contribution
posted on 2023-06-08, 05:14 authored by Vincent Desjacques, Uroš Seljak, Ilian IlievIlian IlievWe investigate the effect of primordial non-Gaussianity of the local fNL type on the auto- and cross-power spectra of dark matter haloes using simulations of the cold dark matter cosmology. We perform a series of large N-body simulations of both positive and negative fNL, spanning the range between 10 and 100. Theoretical models predict a scale-dependent bias correction b(k, fNL) that depends on the linear halo bias b(M). We measure the power spectra for a range of halo mass and redshifts covering the relevant range of existing galaxy and quasar populations. We show that auto- and cross-correlation analyses of bias are consistent with each other. We find that for low wavenumbers with k < 0.03 h Mpc-1 the theory and the simulations agree well with each other for biased haloes with b(M) > 1.5. We show that a scale-independent bias correction improves the comparison between theory and simulations on smaller scales, where the scale-dependent effect rapidly becomes negligible. The current limits on fNL from Slosar et al. come mostly from very large scales k < 0.01 h Mpc-1 and, therefore, remain valid. For the halo samples with b(M) < 1.5 - 2, we find that the scale-dependent bias from non-Gaussianity actually exceeds the theoretical predictions. Our results are consistent with the bias correction scaling linearly with fNL.
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- Published
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- Published version
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Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711External DOI
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1Volume
396Page range
85-96Pages
12.0Department affiliated with
- Physics and Astronomy Publications
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- Yes
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- Yes
Legacy Posted Date
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2016-11-10Usage metrics
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