Constraining the epoch-of-reionization model parameters with the 21-cm bispectrum

Shimabukuro, Hayato; Yoshiura, Shintaro; Takahashi, Keitaro; Yokoyama, Shuichiro; Ichiki, Kiyotomo

doi:10.1093/mnras/stx530

Cited by 48 publications

(43 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only weak upper limits on the EoR 21-cm PS have been estimated till date (McGreer, Mesinger & Fan 2011;Parsons et al 2014;Pober, Greig & Mesinger 2016a). In addition to the PS, various other statistics such as the variance (Patil et al 2014), bispectrum (Yoshiura et al 2015;Shimabukuro et al 2017;Majumdar et al 2018), and the Minkowski Functional (Bag et al 2018;Kapahtia et al 2018) have been proposed to quantify the EoR 21-cm signal .…”

mentioning

confidence: 99%

The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization (EoR) 21-cm power spectrum

Shaw

Bharadwaj

Mondal

2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization (EoR) 21-cm power spectrum

Shaw

Bharadwaj

Mondal

2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…The results revealed a strong dependence of the bispectrum on the scale, as well as on the shape of the triangles from which this statistics is measured (Majumdar et al 2018). This additional information from the bispectrum can strongly improve the constraints on EoR model parameters from power spectrum measurements (Shimabukuro et al 2017).…”

Section: Introductionmentioning

confidence: 72%

Signatures of cosmic reionization on the 21-cm two- and three-point correlation function I: quadratic bias modelling

Hoffmann

Mao

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The three-point correlation function (3PCF) of the 21cm brightness temperature from the Epoch of Reionization (EoR) probes complementary information to the commonly studied two-point correlation function (2PCF) about the morphology of ionized regions. We investigate the 21cm 2PCF and 3PCF in configuration space using seminumerical simulations and test whether they can be described by the local quadratic bias model. We find that fits of bias model predictions for the 2PCF and 3PCF deviate from our measurements by ∼ 20% at scales above the typical size of ionized regions (≃ 30 Mpc) and at early times with global neutral fractions of x HI 0.7. At later times and smaller scales these deviations increase strongly, indicating a break down of the bias model. The 2PCF and 3PCF fits of the linear bias parameter agree at the 10% level for different EoR model configurations. This agreement holds, when adding redshift space distortions to the simulations. The relation between spatial fluctuations in the matter density and the 21cm signal, as predicted by the bias model, is consistent with direct measurements of this relation in simulations for large smoothing scales ( 30 Mpc). From this latter test we conclude that negative amplitudes of the 21cm 3PCF result from negative bias parameters, which describe the anti-correlation between the matter over-densities and the 21cm signal during the EoR. However, a more detailed interpretation of the bias parameters may require a description of nonlocal contributions to the bias model.

show abstract

“…The most prominent of these has been the 21 cm bispectrum [e.g. 102,103,104,105,106]: the natural extension of the 21 cm power spectrum which can notably improve our ability to infer astrophysical information. Alternatively, non-Gaussian information can further be extracted using the Morlet transform [107] along with the higher order moments of the 21 cm brightness temperature PDFs [e.g.…”

Section: Characterising the 21 CM Signalmentioning

confidence: 99%

SKA-Low Intensity Mapping Pathfinder Updates: Deeper 21 cm Power Spectrum Limits from Improved Analysis Frameworks

Barry¹,

Bernardi²,

Greig³

et al. 2021

Preprint

View full text Add to dashboard Cite

The Square Kilometre Array (SKA) is a planned radio interferometer of unprecedented scale that will revolutionize low-frequency radio astronomy when completed. In particular, one of its core science drivers is the systematic mapping of the Cosmic Dawn and Epoch of Reionization, which mark the birth of the first stars and galaxies in the Universe and their subsequent ionization of primordial intergalactic hydrogen, respectively. The SKA will offer the most sensitive view of these poorly understood epochs using the redshifted 21 cm hyperfine signal from intergalactic hydrogen. However, significant technical challenges stand in the way of realizing this scientific promise. These mainly involve the mitigation of systematics coming from astrophysical foregrounds, terrestrial radio interference, and the instrumental response. The Low Frequency Array, the Murchison Widefield Array and the Hydrogen Epoch of Reionization Array are SKA pathfinder experiments that have developed a variety of strategies for addressing these challenges, each with unique characteristics that stem largely from their different instrumental designs. We outline these various directions, highlighting key differences and synergies, and discuss how these relate to the future of lowfrequency intensity mapping with the SKA. We also briefly summarize the challenges associated with modeling the 21 cm signal and discuss the methodologies being proposed for inferring constraints on astrophysical models.

show abstract

Constraining the epoch-of-reionization model parameters with the 21-cm bispectrum

Cited by 48 publications

References 52 publications

The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization (EoR) 21-cm power spectrum

The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization (EoR) 21-cm power spectrum

Signatures of cosmic reionization on the 21-cm two- and three-point correlation function I: quadratic bias modelling

SKA-Low Intensity Mapping Pathfinder Updates: Deeper 21 cm Power Spectrum Limits from Improved Analysis Frameworks

Contact Info

Product

Resources

About