Probing supervoids with weak lensing

Higuchi, Yuichi; Inoue, Kaiki Taro

doi:10.1093/mnras/sty205

Cited by 8 publications

(13 citation statements)

References 56 publications

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“…We then presented a robust S/N 5 detection of the Eridanus supervoid from the reconstructed DES Y3 mass maps (see Table 2), in line with the expectations from related N-body simulation analyses by Higuchi & Inoue (2018). We found no significant difference in the lensing profiles when considering different mass map reconstruction methods (Kaiser-Squires, Wiener filter, Null B-modes).…”

Section: Discussionsupporting

confidence: 80%

“…Considering all the evidence presented, we report a robust S/N 5 detection of a supervoid from the DES Y3 mass maps aligned with the CS. Importantly, this finding is fully consistent with the expectation of a S/N 4 detection from an Eridanus-like supervoid based on the simulation analysis by Higuchi & Inoue (2018).…”

Section: Void Lensing In Simulationssupporting

confidence: 90%

“…In particular, we explore how special it is in the 4100 deg 2 DES Y3 footprint and how its shape and amplitude compare to ΛCDM expectations (see e.g. Higuchi & Inoue 2018).…”

mentioning

confidence: 99%

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The DES view of the Eridanus supervoid and the CMB Cold Spot

Kovács,

Jeffrey,

Gatti

et al. 2021

Preprint

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The Cold Spot is a puzzling large-scale feature in the Cosmic Microwave Background temperature maps and its origin has been subject to active debate. As an important foreground structure at low redshift, the Eridanus supervoid was recently detected, but it was subsequently determined that, assuming the standard ΛCDM model, only about 10-20% of the observed temperature depression can be accounted for via its Integrated Sachs-Wolfe imprint. However, R 100 h −1 Mpc supervoids elsewhere in the sky have shown ISW imprints A ISW ≈ 5.2±1.6 times stronger than expected from ΛCDM (A ISW = 1), which warrants further inspection. Using the Year-3 redMaGiC catalogue of luminous red galaxies from the Dark Energy Survey, here we confirm the detection of the Eridanus supervoid as a significant under-density in the Cold Spot's direction at z < 0.2. We also show, with S/N 5 significance, that the Eridanus supervoid appears as the most prominent large-scale under-density in the dark matter mass maps that we reconstructed from DES Year-3 gravitational lensing data. While we report no significant anomalies, an interesting aspect is that the amplitude of the lensing signal from the Eridanus supervoid at the Cold Spot centre is about 30% lower than expected from similar peaks found in N-body simulations based on the standard ΛCDM model with parameters Ω m = 0.279 and σ 8 = 0.82. Overall, our results confirm the causal relation between these individually rare structures in the cosmic web and in the CMB, motivating more detailed future surveys in the Cold Spot region.

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Section: Discussionsupporting

confidence: 80%

Section: Void Lensing In Simulationssupporting

confidence: 90%

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The DES view of the Eridanus supervoid and the CMB Cold Spot

Kovács,

Jeffrey,

Gatti

et al. 2021

Preprint

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“…Since convergence field traces a matter density between sources and an observer, contiguous underdense regions can be found by smoothing the convergence maps (Higuchi & Inoue 2018). Figure 1 shows a schematic view of our underdense search method.…”

Section: Ray-tracing Simulation and Finding Algorithm For Underdense mentioning

confidence: 99%

“…As such, we can clearly see the effect of the decrement for the massive haloes wherein the significance of the differences is ≥ 3 in total. We compared the results around the largest underdense region to the predictions of the Press-Schechter theory by placing two top-hat voids along the line of sight with assumed properties measured by Higuchi & Inoue (2018). The parameters (density contrast δ, comoving radius χ and redshift z) of the assumed voids were (−0.16, 63h −1 Mpc, 0.23) and (−0.09, 151h −1 Mpc, 0.36).…”

Section: Halo Mass Functionmentioning

confidence: 99%

Environmental effects on halo abundance and weak lensing peak statistics towards large underdense regions

Higuchi

Inoue

2019

Monthly Notices of the Royal Astronomical Society

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The cosmic microwave background (CMB) contains an anomalous cold spot with a surrounding hot ring, known as the Cold Spot. Inoue & Silk (2006) proposed that this feature could be explained by postulating a supervoid: if such a large underdense region exists, then the growth of matter perturbing around the spot might differ from the average value in the Universe and the differences might affect weak lensing analysis of peak statistics. To investigate environmental effects on halo number count and peak statistics, we used a publicly available ray-tracing simulation for a box size of 2250h −1 Mpc on a side (Takahashi et al. 2017). We found that the number counts for massive haloes toward the largest underdense region in the simulation decreases and the corresponding significance of the difference, based on a cosmic average, is ≥ 3σ. On the basis of the results of peak statistics analysis, the number of high peaks decreases with the decrement of massive haloes, but the number of low peaks increases with the lack of matter in the line of sight. The highest significance of the decrement in peak counts in large underdense regions is 5σ in the total signal-to-noise ratio. Our result implies that environmental effects on halo abundance and weak lensing peak statistic can be used to probe the presence and properties of supervoids.

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The DES view of the Eridanus supervoid and the CMB cold spot

Kovács

Jeffrey

Gatti

et al. 2021

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The Cold Spot is a puzzling large-scale feature in the Cosmic Microwave Background temperature maps and its origin has been subject to active debate. As an important foreground structure at low redshift, the Eridanus supervoid was recently detected, but it was subsequently determined that, assuming the standard ΛCDM model, only about 10–20 per cent of the observed temperature depression can be accounted for via its Integrated Sachs–Wolfe imprint. However, R ≳ 100 h−1Mpc supervoids elsewhere in the sky have shown ISW imprints AISW ≈ 5.2 ± 1.6 times stronger than expected from ΛCDM (AISW = 1), which warrants further inspection. Using the Year-3 redMaGiC catalogue of luminous red galaxies from the Dark Energy Survey, here we confirm the detection of the Eridanus supervoid as a significant underdensity in the Cold Spot’s direction at z < 0.2. We also show, with S/N ≳ 5 significance, that the Eridanus supervoid appears as the most prominent large-scale underdensity in the dark matter mass maps that we reconstructed from DES Year-3 gravitational lensing data. While we report no significant anomalies, an interesting aspect is that the amplitude of the lensing signal from the Eridanus supervoid at the Cold Spot centre is about 30 per cent lower than expected from similar peaks found in N-body simulations based on the standard ΛCDM model with parameters Ωm = 0.279 and σ8 = 0.82. Overall, our results confirm the causal relation between these individually rare structures in the cosmic web and in the CMB, motivating more detailed future surveys in the Cold Spot region.

show abstract

Probing supervoids with weak lensing

Cited by 8 publications

References 56 publications

The DES view of the Eridanus supervoid and the CMB Cold Spot

The DES view of the Eridanus supervoid and the CMB Cold Spot

Environmental effects on halo abundance and weak lensing peak statistics towards large underdense regions

The DES view of the Eridanus supervoid and the CMB cold spot

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