Hi intensity mapping with MeerKAT: power spectrum detection in cross-correlation with WiggleZ galaxies

Monday 5 Jun 2023, 14:30 → 14:50 Europe/Rome

0/0-3 - Sala Rosino (Dipartimento di Fisica e Astronomia - Edificio ex-Rizzato)

Speakers: Alessandro Bianchetti (Università degli Studi di Padova)

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 ∼ 0.13 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.

2206.01579.pdf

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