期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 494, 期 4, 页码 5734-5750出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1135
关键词
methods: analytical; methods: observational; galaxies: clusters: general; cosmic background radiation; cosmology: observations
资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [725456]
- Royal Society
With increasing sensitivity, angular resolution, and frequency coverage, future cosmic microwave background (CMB) experiments like PICO will allow us to access new information about galaxy clusters through the relativistic thermal Sunyaev-Zeldovich (SZ) effect. We will be able to map the temperature of relativistic electrons across the entire sky, going well beyond a simple detection of the relativistic SZ effect by cluster stacking methods that currently define the state-of-the-art. Here, we propose a new map-based approach utilizing SZ-temperature moment expansion and constrained-ILC methods to extract electron gas temperature maps from foreground-obscured CMB data. This delivers a new independent map-based observable, the electron temperature power spectrum T-e(yy)(l), which can be used to constrain cosmology in addition to the Compton-y power spectrum C-l(yy)(l). We find that PICO has the required sensitivity, resolution, and frequency coverage to accurately map the electron gas temperature of galaxy clusters across the full sky, covering a broad range of angular scales. Frequency coverage at nu greater than or similar to 300 GHz plays an important role for extracting the relativistic SZ effect in the presence of foregrounds. For Coma, PICO will allow us to directly reconstruct the electron temperature profile using the relativistic SZ effect. Coma's average electron temperature will be measured to 10 sigma significance after foreground removal using PICO. Low angular resolution CMBexperiment like LiteBIRD could achieve 2 sigma to 3 sigma measurement of the electron temperature of this largest cluster. Our analysis highlights a new spectroscopic window into the thermodynamic properties of galaxy clusters and the diffuse electron gas at large angular scales.
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