Ionized bubble number count as a probe of non-Gaussianity
(2012) Monthly Notices of the Royal Astronomical Society — Vol. 420, n° 1, p. 441-446 (2012)
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- 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 re-ionization process, because the formation of collapsed objects, which could be the source of re-ionization 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 parametrized by f <inf>NL</inf>. 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 <inf>b</inf> 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 <inf>NL</inf> from the number count by future observations such as Low Frequency Array (LOFAR) and Square Kilometre Array (SKA). © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
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Tashiro, H., & Sugiyama, N. (2012). Ionized bubble number count as a probe of non-Gaussianity. Monthly Notices of the Royal Astronomical Society, 420(1), 441-446. https://doi.org/10.1111/j.1365-2966.2011.20049.x (Original work published 2012)