The DOI matches its Crossref record; 8 of the 8 references it cites were found in a registry or an index.
Quantifying the effect of baryon physics on weak lensing tomography: Baryon physics and weak lensing tomography
Open accessAbstract
We use matter power spectra from cosmological hydrodynamic simulations to quantify the effect of baryon physics on the weak gravitational lensing shear signal. The simulations consider a number of processes, such as radiative cooling, star formation, supernovae and feedback from active galactic nuclei (AGN). Van Daalen et al. used the same simulations to show that baryon physics, in particular the strong feedback that is required to solve the overcooling problem, modifies the matter power spectrum on scales relevant for cosmological weak lensing studies. As a result, the use of power spectra from dark matter simulations can lead to significant biases in the inferred cosmological parameters. We show that the typical biases are much larger than the precision with which future missions aim to constrain the dark energy equation of state, w0. For instance, the simulation with AGN feedback, which reproduces X-ray and optical properties of groups of galaxies, gives rise to a ∼40 per cent bias in w0. We also explore the effect of baryon physics on constraints on Ωm, σ8, the running of the spectral index, the mass of the neutrinos and models of warm dark matter. We demonstrate that the modification of the power spectrum is dominated by groups and clusters of galaxies, the effect of which can be modelled. We consider an approach based on the popular halo model and show that simple modifications can capture the main features of baryonic feedback. Despite its simplicity, we find that our model, when calibrated on the simulations, is able to reduce the bias in w0 to a level comparable to the size of the statistical uncertainties for a Euclid-like mission. While observations of the gas and stellar fractions as a function of halo mass can be used to calibrate the model, hydrodynamic simulations will likely still be needed to extend the observed scaling relations down to halo masses of 1012h−1 M⊙.
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Cites
Measurements of Ω and Λ from 42 High‐Redshift Supernovae
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Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology
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The cosmological simulation code gadget-2
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Baryon acoustic oscillations in the Sloan Digital Sky Survey Data Release 7 galaxy sample
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Self-citationThe acceleration of the universe and the physics behind it
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Cited by
The Simons Observatory: science goals and forecasts
Ade, P., Aguirre, J., Ahmed, Z., Aiola, S., Ali, A., Alonso, D., Alvarez, M. A., Arnold, K., Ashton, P., Austermann, J., et al. (2019) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2019/02/056 · Cited by 1,519
KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing
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Self-citationCosmology and fundamental physics with the Euclid satellite
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Self-citationCosmology and Fundamental Physics with the Euclid Satellite
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Metadata
- Authors
- Semboloni, E., Hoekstra, H., Schaye, J., van Daalen, M. P., & McCarthy, I. G.
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2011-09-13
- Volume
- 417
- Issue
- 3
- Pages
- 2020-2035
- ISSN
- 0035-8711 (ISSN-L)
- OpenAlex
- W2138649720
- Cited by
- 321
- References
- 8
- FWCI
- 11.75
- Type
- journal article
- Language
- en
- Open access
- green
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- Semboloni, E., Hoekstra, H., Schaye, J., van Daalen, M. P., & McCarthy, I. G. (2011). Quantifying the effect of baryon physics on weak lensing tomography: Baryon physics and weak lensing tomography. Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1111/j.1365-2966.2011.19385.x
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