H I intensity mapping with MeerKAT: power spectrum detection in cross-correlation with WiggleZ galaxies
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Date
2023-02
Publication Type
Journal Article
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Abstract
We present a detection of correlated clustering between MeerKAT radio intensity maps and galaxies from the WiggleZ Dark Energy Survey. We find a 7.7σ detection of the cross-correlation power spectrum, the amplitude of which is proportional to the product of the HI density fraction (ΩHI), HI bias (bHI), and the cross-correlation coefficient (r). We therefore obtain the constraint ΩHIbHIr [0.86±0.10(stat)±0.12(sys)]×10−3, at an effective scale of keff ∼ 0.13hMpc−1. The intensity maps were obtained from a pilot survey with the MeerKAT telescope, a 64-dish pathfinder array to the SKA Observatory (SKAO). The data were collected from 10.5 h of observations using MeerKAT’s L-band receivers over six nights covering the 11 h field of WiggleZ, in the frequency range 1015–973 MHz (0.400
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published
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Journal / series
Monthly Notices of the Royal Astronomical Society
Volume
518 (4)
Pages / Article No.
6262 - 6272
Publisher
Oxford University Press
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Subject
(cosmology:) large-scale structure of Universe; cosmology: observations; methods: data analysis; methods: statistical; radio lines: general
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Funding
193826 - AstroSignals: A New Window on the Universe, with the New Generation of Large Radio-Astronomy Facilities (SNF)