Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback
We present measurements of the spatial mapping between (hot) baryons and the total matter in the Universe, via the cross-correlation between the thermal Sunyaev-Zeldovich (tSZ) map from Planck and the weak gravitational lensing maps from the Red Sequence Cluster Survey (RCSLenS). The cross-correlati...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Journal article |
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Oxford University Press
2016
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| _version_ | 1826287762476630016 |
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| author | Hojjati, A Tröster, T Harnois-Déraps, J McCarthy, I van Waerbeke, L Choi, A Erben, T Heymans, C Hildebrandt, H Hinshaw, G Ma, Y Miller, L Viola, M Tanimura, H |
| author_facet | Hojjati, A Tröster, T Harnois-Déraps, J McCarthy, I van Waerbeke, L Choi, A Erben, T Heymans, C Hildebrandt, H Hinshaw, G Ma, Y Miller, L Viola, M Tanimura, H |
| author_sort | Hojjati, A |
| collection | OXFORD |
| description | We present measurements of the spatial mapping between (hot) baryons and the total matter in the Universe, via the cross-correlation between the thermal Sunyaev-Zeldovich (tSZ) map from Planck and the weak gravitational lensing maps from the Red Sequence Cluster Survey (RCSLenS). The cross-correlations are performed on the map level where all the sources (including diffuse intergalactic gas) contribute to the signal. We consider two configuration-space correlation function estimators, $\xi^{ y-\kappa}$ and $\xi^ {y-\gamma_{t}}$, and a Fourier space estimator, $C_{\ell}^{y-\kappa}$, in our analysis. We detect a significant correlation out to three degrees of angular separation on the sky. Based on statistical noise only, we can report 13$\sigma$ and 17$\sigma$ detections of the cross-correlation using the configuration-space $y-\kappa$ and $y-\gamma_{t}$ estimators, respectively. Including a heuristic estimate of the sampling variance yields a detection significance of 6$\sigma$ and 8$\sigma$, respectively. A similar level of detection is obtained from the Fourier-space estimator, $C_{\ell}^{y-\kappa}$. As each estimator probes different dynamical ranges, their combination improves the significance of the detection. We compare our measurements with predictions from the cosmo-OWLS suite of cosmological hydrodynamical simulations, where different galactic feedback models are implemented. We find that a model with considerable AGN feedback that removes large quantities of hot gas from galaxy groups and WMAP-7yr best-fit cosmological parameters provides the best match to the measurements. All baryonic models in the context of a Planck cosmology over-predict the observed signal. Similar cosmological conclusions are drawn when we employ a halo model with the observed `universal' pressure profile. |
| first_indexed | 2024-03-07T02:03:31Z |
| format | Journal article |
| id | oxford-uuid:9e300b75-1317-40f0-b491-fdf078844d52 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T02:03:31Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:9e300b75-1317-40f0-b491-fdf078844d522022-03-27T00:48:22ZCross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedbackJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9e300b75-1317-40f0-b491-fdf078844d52Symplectic Elements at OxfordOxford University Press2016Hojjati, ATröster, THarnois-Déraps, JMcCarthy, Ivan Waerbeke, LChoi, AErben, THeymans, CHildebrandt, HHinshaw, GMa, YMiller, LViola, MTanimura, HWe present measurements of the spatial mapping between (hot) baryons and the total matter in the Universe, via the cross-correlation between the thermal Sunyaev-Zeldovich (tSZ) map from Planck and the weak gravitational lensing maps from the Red Sequence Cluster Survey (RCSLenS). The cross-correlations are performed on the map level where all the sources (including diffuse intergalactic gas) contribute to the signal. We consider two configuration-space correlation function estimators, $\xi^{ y-\kappa}$ and $\xi^ {y-\gamma_{t}}$, and a Fourier space estimator, $C_{\ell}^{y-\kappa}$, in our analysis. We detect a significant correlation out to three degrees of angular separation on the sky. Based on statistical noise only, we can report 13$\sigma$ and 17$\sigma$ detections of the cross-correlation using the configuration-space $y-\kappa$ and $y-\gamma_{t}$ estimators, respectively. Including a heuristic estimate of the sampling variance yields a detection significance of 6$\sigma$ and 8$\sigma$, respectively. A similar level of detection is obtained from the Fourier-space estimator, $C_{\ell}^{y-\kappa}$. As each estimator probes different dynamical ranges, their combination improves the significance of the detection. We compare our measurements with predictions from the cosmo-OWLS suite of cosmological hydrodynamical simulations, where different galactic feedback models are implemented. We find that a model with considerable AGN feedback that removes large quantities of hot gas from galaxy groups and WMAP-7yr best-fit cosmological parameters provides the best match to the measurements. All baryonic models in the context of a Planck cosmology over-predict the observed signal. Similar cosmological conclusions are drawn when we employ a halo model with the observed `universal' pressure profile. |
| spellingShingle | Hojjati, A Tröster, T Harnois-Déraps, J McCarthy, I van Waerbeke, L Choi, A Erben, T Heymans, C Hildebrandt, H Hinshaw, G Ma, Y Miller, L Viola, M Tanimura, H Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback |
| title | Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback |
| title_full | Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback |
| title_fullStr | Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback |
| title_full_unstemmed | Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback |
| title_short | Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback |
| title_sort | cross correlating planck tsz with rcslens weak lensing implications for cosmology and agn feedback |
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