HI intensity mapping with the MIGHTEE survey: power spectrum estimates

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dc.contributor.authorSourabh, Paul
dc.contributor.authorSantos, Mario
dc.contributor.authorTownsend, Junaid
dc.date.accessioned2021-08-31T13:07:25Z
dc.date.available2021-08-31T13:07:25Z
dc.date.issued2021
dc.description.abstractIntensity mapping (IM) with neutral hydrogen is a promising avenue to probe the large scale structure of the Universe. In this paper, we demonstrate that using the 64-dish MeerKAT radio telescope as a connected interferometer, it is possible to make a statistical detection of HI in the post-reionization Universe. With the MIGHTEE (MeerKAT International GHz Tiered Extragalactic Exploration) survey project ob- serving in the L-band (856 < < 1712 MHz, z < 0:66), we can achieve the required sensitivity to measure the HI IM power spectrum on quasi-linear scales, which will provide an important complementarity to the single-dish IM MeerKAT observations. We present a purpose-built simulation pipeline that emulates the MIGHTEE obser- vations and forecast the constraints that can be achieved on the HI power spectrum at z = 0:27 for k > 0:3 Mpc􀀀1 using the foreground avoidance method. We present the power spectrum estimates with the current simulation on the COSMOS eld that includes contributions from HI, noise and point source models constructed from the observed MIGHTEE data. The results from our visibility based pipeline are in qualitative agreement to the already available MIGHTEE data. This paper demonstrates that MeerKAT can achieve very high sensitivity to detect HI with the full MIGHTEE survey on quasi-linear scales (signal-to-noise ratio > 7 at k = 0:49 Mpc􀀀1) which are instrumental in probing cosmological quantities such as the spectral index of uctuation, constraints on warm dark matter, the quasi-linear redshift space distortions and the measurement of the HI content of the Universe up to z 0:5.en_US
dc.identifier.citationPaul, S., Santos, M., Townsend, J., Jarvis, M., Maddox, N., Collier, J., Frank, B. and Taylor, R., 2021. H i intensity mapping with the MIGHTEE survey: power spectrum estimates. Monthly Notices of the Royal Astronomical Society, 505(2), pp.2039-2050.en_US
dc.identifier.uri10.1093/mnras/stab1089
dc.identifier.urihttp://hdl.handle.net/10566/6560
dc.language.isoenen_US
dc.publisherMonthly Notices of the Royal Astronomical Societyen_US
dc.subjectcosmology: observations |en_US
dc.subjectlarge-scale structure of Universeen_US
dc.subjecttechniques: interferometricen_US
dc.subjectradio lines: galaxiesen_US
dc.titleHI intensity mapping with the MIGHTEE survey: power spectrum estimatesen_US
dc.typeArticleen_US

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