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The cosmology dependence of galaxy clustering and lensing from a hybrid N-body-perturbation theory model
- Source :
- Monthly Notices of the Royal Astronomical Society, vol 505, iss 1
- Publication Year :
- 2021
- Publisher :
- eScholarship, University of California, 2021.
-
Abstract
- We implement a model for the two-point statistics of biased tracers that combines dark matter dynamics from $N$-body simulations with an analytic Lagrangian bias expansion. Using Aemulus, a suite of $N$-body simulations built for emulation of cosmological observables, we emulate the cosmology dependence of these nonlinear spectra from redshifts $z = 0$ to $z=2$. We quantify the accuracy of our emulation procedure, which is sub-per cent at $k=1\, h {\rm Mpc}^{-1}$ for the redshifts probed by upcoming surveys and improves at higher redshifts. We demonstrate its ability to describe the statistics of complex tracer samples, including those with assembly bias and baryonic effects, reliably fitting the clustering and lensing statistics of such samples at redshift $z\simeq 0.4$ to scales of $k_{\rm max} \approx 0.6\, h\mathrm{Mpc}^{-1}$. We show that the emulator can be used for unbiased cosmological parameter inference in simulated joint clustering and galaxy--galaxy lensing analyses with data drawn from an independent $N$-body simulation. These results indicate that our emulator is a promising tool that can be readily applied to the analysis of current and upcoming datasets from galaxy surveys.<br />Comment: 19 pages, 17 figures. Updated to reflect the journal version. Code available at https://github.com/kokron/anzu
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Dark matter
statistical [methods]
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astronomy & Astrophysics
01 natural sciences
Cosmology
0103 physical sciences
Cluster analysis
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Physics
theory [cosmology]
010308 nuclear & particles physics
Astronomy and Astrophysics
Observable
Redshift
Galaxy
Baryon
Space and Planetary Science
astro-ph.CO
Perturbation theory (quantum mechanics)
large-scale structure of Universe
Astrophysics - Instrumentation and Methods for Astrophysics
Astronomical and Space Sciences
Astrophysics - Cosmology and Nongalactic Astrophysics
astro-ph.IM
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society, vol 505, iss 1
- Accession number :
- edsair.doi.dedup.....272ca21b68859cd07c8860d0d95791ec