Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-30877
Desjacques, V; Seljak, U; Iliev, I T (2009). Scale-dependent bias induced by local non-Gaussianity: a comparison to N-body simulations. Monthly Notices of the Royal Astronomical Society, 396(1):85-96.
View at publisher
We 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 Λ 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 Δb(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.
39 downloads since deposited on 26 Feb 2010
13 downloads since 12 months
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Dewey Decimal Classification:||530 Physics|
|Uncontrolled Keywords:||gravitation; galaxies: haloes; cosmology: theory; dark matter|
|Deposited On:||26 Feb 2010 13:16|
|Last Modified:||05 Apr 2016 13:56|
|Funders:||Swiss National Foundation [200021-116696/1]|
|Additional Information:||The attached file is a preprint (accepted version) of an article published in Monthly Notices of the Royal Astronomical Society. The definitive version is available at www3.interscience.wiley.com|
Users (please log in): suggest update or correction for this item
Repository Staff Only: item control page