Using strong gravitational lensing to probe the post reionization \HI power spectrum

Abstract

Probing statistical distribution of the neutral hydrogen (\HI) using the redshifted 21-cm hyperfine-transition spectral line holds the key to understand the formation and evolution of the matter density in the universe. The two-point statistics of the \HI distribution can be estimated by measuring the power spectrum of the redshifted 21-cm signal using visibility correlation. A major challenge in this regard is that the expected signal is weak compared to the foreground contribution from the Galactic synchrotron emission and extragalactic point sources in the observing frequencies. In this work, we investigate the possibility of detecting the power spectrum of the redshifted 21-cm signal by using strong gravitational lensing of the galaxy clusters. This method has the advantage that it only enhances the \HI signal and not the diffuse galactic foreground. Based on four simple models of the cluster potentials we show that the strong lenses at relatively lower redshifts with more than one dark matter halo significantly enhances the 21-cm signal from the post reionization era. We discuss the merits and demerits of the method and the future studies required for further investigations.

9 pages, 6 figures

References in corpus (15)

• Observational constraints on Cosmic Reionization
• A Bayesian approach to strong lensing modelling of galaxy clusters
• Cluster Lenses
• Foreground simulations for the LOFAR - Epoch of Reionization Experiment
• Mass and magnification maps for the Hubble Space Telescope Frontier Fields clusters: implications for high redshift studies
• Lens models and magnification maps of the six Hubble Frontier Fields clusters
• On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
• Foregrounds for redshifted 21 cm studies of reionization: GMRT 153 MHz observations
• Strong Lensing in Abell 1703: Constraints on the Slope of the Inner Dark Matter Distribution
• Fast simulations for intensity mapping experiments
• Modelling redshift-space distortion in the post-reionization $\mathrm{HI}$ 21-cm power spectrum
• Gravitational Lensing of Cosmological 21cm Emission
• Redshift space distortions of the {\rm HI} 21-cm intensity mapping signal due to the internal motions within galaxies
• Towards the first detection of strongly lensed HI emission
• Validating a novel angular power spectrum estimator using simulated low frequency radio-interferometric data

Cited by in corpus (1)

• Combined lensed estimator to probe the post reionization H I power spectrum