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Understanding the impact of Light cone effect on the EoR/CD 21-cm power spectrum

Published online by Cambridge University Press:  08 May 2018

Kanan K. Datta ,
Rajesh Mondal ,
Raghunath Ghara Open the ORCID record for Raghunath Ghara [Opens in a new window] ,
Somnath Bharadwaj  and
T. Roy Choudhury
Kanan K. Datta
Affiliation:
Physics Department, Presidency University, 86/1 College Street, Kolkata-73, WB, India
Rajesh Mondal
Affiliation:
Centre for Theoretical Studies, Indian Institute of Technology Kharagpur-721302, India Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Pevensey II Building, Falmer, Brighton BN1 9QH
Raghunath Ghara
Affiliation:
Department of Astronomy and Oskar Klein Centre, AlbaNova, Stockholm University, SE-106 91 Stockholm, Sweden
Somnath Bharadwaj
Affiliation:
Centre for Theoretical Studies, Indian Institute of Technology Kharagpur-721302, India
T. Roy Choudhury
Affiliation:
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research,Post Bag 3, Ganeshkhind, Pune 411 007, India email: kanan.physics@presiuniv.ac.in
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Abstract

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Redshifted HI 21-cm signal from the cosmic dawn and epoch of reionization evolve considerably along the LoS. We study the impact of this evolution (so called the light cone effect) on the HI 21-cm power spectrum. It is found that the LC effect has a significant impact on the 3D power spectrum and the change could be up to a factor of few. The LC effect is particularly strong during the cosmic dawn near the ‘peaks’ and ‘dips’ in the power spectrum when plotted with redshift. We also show that the 3D power spectrum, which could fully describe ergodic and periodic signal, losses out some information regarding the second order statistics of the signal as the EoR/CD 21-cm signal is non-ergodic and non-periodic along the line of sight. We show that the multi-frequency angular power spectrum (MAPS) ${\mathcal {C}}_{\ell }(\nu _1, \nu _2)$ captures all the information regarding the second order statistics of the signal even in the presence of the LC effect.

Keywords

Cosmology: Epoch of ReionizationCosmic Dawn21-cm lineTheory & SimulationsStatistical analysis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 12 - 17
Copyright
Copyright © International Astronomical Union 2018 

References

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