http://arxiv.org/abs/2211.07502
Galaxies, diffuse gas and dark matter make up the cosmic web defining the large-scale structure of the universe. We constrain the joint distribution of these constituents by cross-correlating galaxy samples binned by stellar mass from the Sloan Digital Sky Survey CMASS catalogue with maps of lensing convergence and the thermal Sunyaev-Zeldovich (tSZ) effect from the Planck mission. Fitting a halo-based model to our measured angular power spectra (galaxy-galaxy, galaxy-lensing convergence, galaxy-tSZ) at a median redshift of $z=0.53$, we detect variation with stellar mass of the galaxy satellite fraction and galaxy spatial distribution within host halos. We find a tSZ-halo hydrostatic mass bias, $b_h$, such that $(1-b_h)=0.6\pm0.05$, with a hint of larger bias, $b_h$, at the high stellar mass end. The normalization of the galaxy-lensing convergence cross-power spectrum shows that galaxies trace the matter distribution with no indication of stochasticity ($A=0.97\pm 0.09$). We forecast that next generation cosmic microwave background experiments will improve constraints on the hydrostatic bias by a factor of two and be able to constrain the small-scale distribution of dark matter, hence informing theory on feedback processes.
R. Kou and J. Bartlett
Tue, 15 Nov 22
93/103
Comments: 19 pages, 11 figures, submitted to A&A