Dr Leah Morabito leah.k.morabito@durham.ac.uk
Associate Professor
Reaching small scales with low-frequency imaging: applications to the Dark Ages
Morabito, L.K.; Silk, J.
Authors
J. Silk
Abstract
The initial conditions for the density perturbations in the early Universe, which dictate the large-scale structure and distribution of galaxies we see today, are set during inflation. Measurements of primordial non-Gaussianity are crucial for distinguishing between different inflationary models. Current measurements of the matter power spectrum from the cosmic microwave background only constrain this on scales up to k ∼ 0.1 Mpc−1. Reaching smaller angular scales (higher values of k) can provide new constraints on non-Gaussianity. A powerful way to do this is by measuring the HI matter power spectrum at z≳30. In this paper, we investigate what values of k can be reached for the Low-Frequency Array (LOFAR), which can achieve ≲1″ resolution at approximately 50 MHz. Combining this with a technique to isolate the spectrally smooth foregrounds to a wedge in k∥–k⊥ space, we demonstrate what values of k we can feasibly reach within observational constraints. We find that LOFAR is approximately five orders of magnitude away from the desired sensitivity, for 10 years of integration time.
Citation
Morabito, L., & Silk, J. (2021). Reaching small scales with low-frequency imaging: applications to the Dark Ages. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379(2188), Article 20190571. https://doi.org/10.1098/rsta.2019.0571
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 1, 2020 |
Online Publication Date | Nov 23, 2020 |
Publication Date | 2021-01 |
Deposit Date | Jan 11, 2021 |
Publicly Available Date | Mar 29, 2024 |
Journal | Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. |
Print ISSN | 1364-503X |
Electronic ISSN | 1471-2962 |
Publisher | The Royal Society |
Peer Reviewed | Peer Reviewed |
Volume | 379 |
Issue | 2188 |
Article Number | 20190571 |
DOI | https://doi.org/10.1098/rsta.2019.0571 |
Related Public URLs | https://arxiv.org/abs/2007.13353 |
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Copyright Statement
© The Authors. Made available under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
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