Cosmic voids in the up-coming J-PAS survey: prospects for CMB cross-correlation measurements

Nestor Arsenov, Andras Kovacs, Carlos Hernandez-Monteagudo


The imprints of large-scale structures on the Cosmic Microwave Background (CMB) probe the growth of structure in the low-redshift cosmic web. In this analysis, we forecasted the expected constraining power of the J-PAS survey in the context of CMB lensing, thermal Sunyaev-Zeldovich (tSZ), and integrated Sachs-Wolfe (ISW) signals from cosmic voids and focused especially on the quasar tracer samples at z>1. The expected gain in CMB cross-correlation measurements compared to recent spectroscopic quasar surveys comes from a unique combination of an extended survey footprint, accurate photometric redshifts using 56 narrow-band filters, and the high spatial density of the available quasar targets. To perform our modelling, we followed a Halo Occupation Distribution (HOD) approach and populated a small subset of the dark matter halos with quasars in the WebSky simulation at z>1. This synthetic data set also provides high-quality maps of the relevant secondary CMB anisotropies due to the matter distribution. We compared different void finder algorithms in the WebSky mock catalogues, and correlated the positions of cosmic voids with the CMB maps, given similar observational conditions to what is expected for the J-PAS survey. We found that J-PAS will provide robust detections of all three secondary CMB imprints that we considered and will provide competitive constraints on the underlying cosmological model.