H i intensity mapping with MeerKAT: Power spectrum detection in cross-correlation with WiggleZ galaxies
H i intensity mapping with MeerKAT: Power spectrum detection in cross-correlation with WiggleZ galaxies
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DOI：
10.1093/mnras/stac3060
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发表时间：
2022-06
影响因子：
4.8
通讯作者：
Steven Cunnington;Yichao Li;Mário G. Santos;Jingying Wang;I. Carucci;M. Irfan;A. Pourtsidou;M. Spinelli;L. Wolz;P. S. Soares;C. Blake;P. Bull;B. Engelbrecht;J. Fonseca;K. Grainge;Yin-Zhe Ma
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文献类型：
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作者：
Steven Cunnington;Yichao Li;Mário G. Santos;Jingying Wang;I. Carucci;M. Irfan;A. Pourtsidou;M. Spinelli;L. Wolz;P. S. Soares;C. Blake;P. Bull;B. Engelbrecht;J. Fonseca;K. Grainge;Yin-Zhe Ma
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 ${\rm H}\, \small {\rm I}$ density fraction ($\Omega _{{\rm H}\, \small {\rm I}}$), ${\rm H}\, \small {\rm I}$ bias ($b_{{\rm H}\, \small {\rm I}}$) and the cross-correlation coefficient (r). We therefore obtain the constraint $\Omega _{{\rm H}\, \small {\rm I}}b_{{\rm H}\, \small {\rm I}}r\, {=}\, [0.86\, {\pm }\, 0.10\, ({\rm stat})\, {\pm }\, 0.12\, ({\rm sys})]\, {\times }\, 10^{-3}$, at an effective scale of keff ∼ 0.13 h Mpc−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 hours of observations using MeerKAT’s L-band receivers over six nights covering the 11hr field of WiggleZ, in the frequency range 1015–973 MHz (0.400 < z < 0.459 in redshift). This detection is the first practical demonstration of the multi-dish auto-correlation intensity mapping technique for cosmology. This marks an important milestone in the roadmap for the cosmology science case with the full SKAO.
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 ${\rm H}\, \small {\rm I}$ density fraction ($\Omega _{{\rm H}\, \small {\rm I}}$), ${\rm H}\, \small {\rm I}$ bias ($b_{{\rm H}\, \small {\rm I}}$) and the cross-correlation coefficient (r). We therefore obtain the constraint $\Omega _{{\rm H}\, \small {\rm I}}b_{{\rm H}\, \small {\rm I}}r\, {=}\, [0.86\, {\pm }\, 0.10\, ({\rm stat})\, {\pm }\, 0.12\, ({\rm sys})]\, {\times }\, 10^{-3}$, at an effective scale of keff ∼ 0.13 h Mpc−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 hours of observations using MeerKAT’s L-band receivers over six nights covering the 11hr field of WiggleZ, in the frequency range 1015–973 MHz (0.400 < z < 0.459 in redshift). This detection is the first practical demonstration of the multi-dish auto-correlation intensity mapping technique for cosmology. This marks an important milestone in the roadmap for the cosmology science case with the full SKAO.