English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
 Local TagsRelease HistoryDetailsSummary
  Separate Universe simulations with IllustrisTNG: baryonic effects on power spectrum responses and higher-order statistics

Barreira, A., Nelson, D., Pillepich, A., Springel, V., Schmidt, F., Pakmor, R., et al. (2019). Separate Universe simulations with IllustrisTNG: baryonic effects on power spectrum responses and higher-order statistics. Monthly Notices of the Royal Astronomical Society, 488, 2079-2092.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D1E2-F Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D1E3-E
Genre: Journal Article

Files

show Files

Locators

show
hide
Locator:
https://ui.adsabs.harvard.edu/abs/2019MNRAS.488.2079B (Any fulltext)
Description:
-
OA-Status:

Creators

show
hide
 Creators:
Barreira, Alexandre1, Author
Nelson, Dylan1, Author
Pillepich, Annalisa1, Author
Springel, Volker1, Author
Schmidt, Fabian1, Author
Pakmor, Ruediger1, Author
Hernquist, Lars1, Author
Vogelsberger, Mark1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Content

show
hide
Free keywords: gravitational lensing: weak large-scale structure of Universe Astrophysics - Cosmology and Nongalactic Astrophysics
 Abstract: We measure power spectrum response functions in the presence of baryonic physical processes using separate universe simulations with the IllustrisTNG galaxy formation model. The response functions describe how the small-scale power spectrum reacts to long-wavelength perturbations and they can be efficiently measured with the separate universe technique by absorbing the effects of the long modes into a modified cosmology. Specifically, we focus on the total first-order matter power spectrum response to an isotropic density fluctuation R1(k, z), which is fully determined by the logarithmic derivative of the non- linear matter power spectrum dlnPm(k, z)/dlnk and the growth- only response function G1(k, z). We find that G1(k, z) is not affected by the baryonic physical processes in the simulations at redshifts z < 3 and on all scales probed (k ≲ 15 h Mpc-1; i.e. length scales ≳ 0.4 Mpc h^{-1}). In practice, this implies that the power spectrum fully specifies the baryonic dependence of its response function. Assuming an idealized lensing survey set-up, we evaluate numerically the baryonic impact on the squeezed-lensing bispectrum and the lensing supersample power spectrum covariance, which are given in terms of responses. Our results show that these higher-order lensing statistics can display varying levels of sensitivity to baryonic effects compared to the power spectrum, with the squeezed bispectrum being the least sensitive. We also show that ignoring baryonic effects on lensing covariances slightly overestimates the error budget (and is therefore conservative from the point of view of parameter error bars) and likely has negligible impact on parameter biases in inference analyses.

Details

show
hide
Language(s):
 Dates: 2019
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 488 Sequence Number: - Start / End Page: 2079 - 2092 Identifier: -