Ionized bubble number count as a probe of non-Gaussianity

Abstract

The number count of ionized bubbles on a map of 21 cm fluctuations with the primordial non-Gaussianity is investigated. The existence of the primordial non-Gaussianity modifies the reionization process, because the formation of collapsed objects, which could be the source of reionization photons, is affected by the primordial non-Gaussianity. In this paper, the abundance of ionized bubbles is calculated by using a simple analytic model with the local type of the primordial non-Gaussianity, which is parameterized by f_{NL}. In order to take into account the dependence of the number count on the size of ionized bubbles and the resolution of the observation instrument, a threshold parameter B_b which is related to the the surface brightness temperature contrast of an ionized bubble is introduced. We show the potential to put the constraint on f_{NL} from the number count by future observations such as LOFAR and SKA.

6 pages and 9 figures, submitted to MNRAS

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• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• The Void Abundance with Non-Gaussian Primordial Perturbations
• Cosmological HII Bubble Growth During Reionization
• Detecting ionized bubbles in redshifted 21 cm maps
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Cited by in corpus (4)

• The scale-dependent signature of primordial non-Gaussianity in the large-scale structure of cosmic reionization
• The 21cm radiation from minihalos as a probe of small primordial non-Gaussianity
• Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos
• Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization