Mapping gas around massive galaxies:cross-correlation of DES Y3 galaxies and Compton-y maps from SPT and Planck
We cross-correlate positions of galaxies measured in data from the first three years of the Dark Energy Survey with Compton-y maps generated using data from the South Pole Telescope (SPT) and the Planck mission. We model this cross-correlation measurement together with the galaxy autocorrelation to...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2023
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Subjects: | |
Online Access: | https://researchers.mq.edu.au/en/publications/1f3fa2f1-b6a4-4750-853d-88f253934528 https://doi.org/10.1093/mnras/stad1167 http://www.scopus.com/inward/record.url?scp=85161516546&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/DP200101068 |
Summary: | We cross-correlate positions of galaxies measured in data from the first three years of the Dark Energy Survey with Compton-y maps generated using data from the South Pole Telescope (SPT) and the Planck mission. We model this cross-correlation measurement together with the galaxy autocorrelation to constrain the distribution of gas in the Universe. We measure the hydrostatic mass bias or, equivalently, the mean halo bias-weighted electron pressure h P e >, using large-scale information. We find h P e> to be [0.16 +0.03 -0.04 , 0.28 +0.04 -0.05 , 0.45 +0.06 -0.10 , 0.54 +0.08 -0.07 , 0.61 +0.08 -0.06 , 0.63 +0.07 -0.08 ] meV cm −3 at redshifts z ∼ [0.30, 0.46, 0.62, 0.77, 0.89, 0.97]. These values are consistent with previous work where measurements exist in the redshift range. We also constrain the mean gas profile using small-scale information, enabled by the high-resolution of the SPT data. We compare our measurements to different parametrized profiles based on the cosmo-OWLS hydrodynamical simulations. We find that our data are consistent with the simulation that assumes an AGN heating temperature of 10 8.5 K but are incompatible with the model that assumes an AGN heating temperature of 10 8.0 K. These comparisons indicate that the data prefer a higher value of electron pressure than the simulations within r 500c of the galaxies’ haloes. |
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