Mapping the dark matter with weak gravitational lensing

Kaiser, Nick; Squires, G.

doi:10.1086/172297

Cited by 825 publications

(966 citation statements)

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“…Hence, the mass value can be regarded as a conservative lower limit on the mass contained within the blob region. A mass map generated using the method of [28] shows a 4 detection of mass in this region, compared to ''noise'' maps based on randomized shear values. A detailed description of the data and methodology of the weak lensing analysis is given elsewhere [29].…”

Section: The Dark Matter Blob In the Galaxy Cluster Abell 520mentioning

confidence: 97%

Probing the nature of dark matter with cosmic x rays: Constraints from “dark blobs” and grating spectra of galaxy clusters

et al. 2007

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Gravitational lensing observations of galaxy clusters have identified dark matter blobs with remarkably low baryonic content. We use such a blob to probe the particle nature of dark matter with x-ray observations. From these observations we improve the most conservative constraints from the Milky Way halo on a particular dark matter candidate, the sterile neutrino, by an order of magnitude. We also study high resolution x-ray grating spectra of a cluster of galaxies. Based on these conservative constraints obtained from cosmic x-ray observations alone, the low mass (m s & 10 keV) and low mixing angle (sin 2 2 & 10 ÿ6 ) sterile neutrino is still a viable dark matter candidate.

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Section: The Dark Matter Blob In the Galaxy Cluster Abell 520mentioning

confidence: 97%

Probing the nature of dark matter with cosmic x rays: Constraints from “dark blobs” and grating spectra of galaxy clusters

et al. 2007

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“…Another approach for weak lensing peak studies is to reconstruct the convergence field from ǫ taking into account the nonlinear relation between g and γ (e.g., Kaiser & Squires 1993;Kaiser et al 1995;Seitz & Schneider 1995;Bartelmann 1995;Squire & Kaiser 1996;Seitz & Schneider 1997;Jauzac et al 2012;Jullo et al 2014). In this approach, to avoid unphysical results, it is important to filter ǫ first and then to proceed with convergence reconstruction using the filtered ǫ .…”

Section: Theoretical Aspectsmentioning

confidence: 99%

Cosmological constraints from weak lensing peak statistics with Canada-France-Hawaii Telescope Stripe 82 Survey

Liu¹,

Pan²,

Li³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We derived constraints on cosmological parameters using weak lensing peak statistics measured on the ∼ 130 deg 2 of the Canada-France-Hawaii Telescope Stripe 82 Survey (CS82). This analysis demonstrates the feasibility of using peak statistics in cosmological studies. For our measurements, we considered peaks with signal-to-noise ratio in the range of ν = [3, 6]. For a flat ΛCDM model with only (Ω m , σ 8 ) as free parameters, we constrained the parameters of the following relation Σ 8 = σ 8 (Ω m /0.27) α to be: Σ 8 = 0.82 ± 0.03 and α = 0.43 ± 0.02. The α value found is considerably smaller than the one measured in two-point and three-point cosmic shear correlation analyses, showing a significant complement of peak statistics to standard weak lensing cosmological studies. The derived constraints on (Ω m , σ 8 ) are fully consistent with the ones from either WMAP9 or Planck. From the weak lensing peak abundances alone, we obtained marginalised mean values of Ω m = 0.38 +0.27 −0.24 and σ 8 = 0.81 ± 0.26. Finally, we also explored the potential of using weak lensing peak statistics to constrain the mass-concentration relation of dark matter halos simultaneously with cosmological parameters.

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“…This smoothing has been employed, e.g., in some weak lensing studies (Kaiser & Squires 1993;Tyson & Fischer 1995;Luppino & Kaiser 1997;Fischer 1999). The interpolation procedure (67) lacks several of the properties described above.…”

Section: Fixed Weightsmentioning

confidence: 99%

Interpolation and smoothing

Lombardi

2002

A&A

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Abstract. Smoothing is omnipresent in astronomy, because almost always measurements performed at discrete positions in the sky need to be interpolated into a smooth map for subsequent analysis. Still, the statistical properties of different interpolation techniques are very poorly known. In this paper, we consider the general problem of interpolating discrete data whose location measurements are distributed on the sky according to a known density distribution (with or without clustering). We derive expressions for the expectation value and for the covariance of the smoothed map for many interpolation techniques, and obtain a general method that can be used to obtain these quantities for any linear smoothing. Moreover, we show that few basic properties of smoothing procedures have important consequences on the statistical properties of the smoothed map. Our analysis allows one to obtain the statistical properties of an arbitrary interpolation procedure, and thus to optimally choose the technique that is most suitable for one's needs.

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Mapping the dark matter with weak gravitational lensing

Cited by 825 publications

References 0 publications

Probing the nature of dark matter with cosmic x rays: Constraints from “dark blobs” and grating spectra of galaxy clusters

Probing the nature of dark matter with cosmic x rays: Constraints from “dark blobs” and grating spectra of galaxy clusters

Cosmological constraints from weak lensing peak statistics with Canada-France-Hawaii Telescope Stripe 82 Survey

Interpolation and smoothing

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