Neutral hydrogen at high redshifts as a probe of structure formation - III: Radio maps from N-body simulations

Bagla, J. S. ; Nath, Biman ; Padmanabhan, T. (1997) Neutral hydrogen at high redshifts as a probe of structure formation - III: Radio maps from N-body simulations Monthly Notices of the Royal Astronomical Society, 289 (3). pp. 671-680. ISSN 0035-8711

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Official URL: http://adsabs.harvard.edu/cgi-bin/nph-data_query?b...

Abstract

Large inhomogeneities in neutral hydrogen in the Universe can be detected at redshifts z≤10 using the redshifted 21-cm line emission. We use cosmological N-body simulations for dark matter and a simple model for baryonic collapse to estimate the signal expected from structures like protoclusters of galaxies at high redshifts. We study (i) the standard cold dark matter (CDM) model, (ii) a modified CDM model with less power at small scales, and (iii) a Λ+CDM model in a universe with Ω0Λ=1. We show that it should be possible for the next generation of radio telescopes to detect such structures at a redshift of 3.34 with an integration of about 100 h. We also discuss possible schemes for enhancing signal-to-noise ratio to detect protocondensates at high redshifts.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Galaxies: Formation; Cosmology: Theory; Early Universe; Large-scale Structure of Universe
ID Code:72501
Deposited On:29 Nov 2011 05:36
Last Modified:29 Nov 2011 05:36

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