Full-sky integrated Sachs–Wolfe maps for the MICE grand challenge lightcone simulation

Author:

Naidoo Krishna12ORCID,Fosalba Pablo34ORCID,Whiteway Lorne2,Lahav Ofer2

Affiliation:

1. Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/46, PL-02-668 Warsaw, Poland

2. Department of Physics & Astronomy, University College London, Gower Street, WC1E 6BT London, UK

3. Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain

4. Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain

Abstract

ABSTRACT We present full-sky maps of the Integrated Sachs–Wolfe effect (ISW) for the MICE Grand Challenge lightcone simulation up to redshift 1.4. The maps are constructed in the linear regime using spherical Bessel transforms. We compare and contrast this procedure against analytical approximations found in the literature. By computing the ISW in the linear regime, we remove the substantial computing and storage resources required to calculate the non-linear Rees–Sciama effect. Since the linear ISW at low redshift z ≲ 1, at large angular scales, and after matter domination is ${\sim}10^{2}\, \mathrm{ times}$ larger in ΔT/T, this has a negligible impact on the maps produced and only becomes relevant on scales which are dominated by cosmic microwave background (CMB) anisotropies. The MICE simulation products have been extensively used for studies involving current and future galaxy surveys. The availability of these maps will allow MICE to be used for future galaxy and CMB cross-correlation studies, ISW reconstruction studies, and ISW void-stacking studies probed by galaxy surveys such as Dark Energy Survey, Dark Energy Spectroscopic Instrument, Euclid, and Rubin Legacy Survey of Space and Time. The pipeline developed in this study is provided as a public Python package pyGenISW. This could be used in the future studies for constructing the ISW from existing and future simulation suites probing vast sets of cosmological parameters and models.

Funder

Science and Technology Facilities Council

National Science Centre

MINECO

European Union

ERDF

Generalitat de Catalunya

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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