{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/cross-correlation-of-the-thermal-sunyaev-zel-1","title":"Cross-correlation of the thermal Sunyaev--Zel'dovich and CMB lensing signals in Planck PR4 data with robust CIB decontamination","arxiv_id":"2308.16260","date":"2023-08-30","proceeding":null,"authors":["Fiona McCarthy","J. Colin Hill"],"abstract":"We use the full-mission Planck PR4 data to measure the CMB lensing convergence ($\\kappa$)--thermal Sunyaev-Zel'dovich (tSZ, $y$) cross-correlation, $C_\\ell^{y\\kappa}$. This is only the second measurement to date of this signal, following Hill \\& Spergel (2014). We perform the measurement using foreground-cleaned tSZ maps built from the PR4 frequency maps via a tailored needlet internal linear combination (NILC) code in our companion paper, in combination with the Planck PR4 $\\kappa$ maps and various systematic-mitigated PR3 $\\kappa$ maps. A serious systematic is the residual cosmic infrared background (CIB) in the tSZ map, as the high CIB--$\\kappa$ correlation can significantly bias the inferred tSZ--$\\kappa$ cross-correlation. We mitigate this by deprojecting the CIB in our NILC, using a moment-deprojection approach to avoid leakage due to incorrect modelling of the CIB frequency dependence. We validate our method on mm-sky simulations. We fit a theoretical halo model to our measurement, finding a best-fit amplitude of $A=0.82\\pm0.21$ (for the highest signal-to-noise PR4 $\\kappa$ map) or $A=0.56\\pm0.24$ (for a PR3 $\\kappa$ map built from a tSZ-deprojected CMB map), indicating that the data are consistent with our model within $\\sim 1$-$2\\sigma$. Although our error bars are similar to those of the 2014 measurement, our method is significantly more robust to CIB contamination. Our moment-deprojection approach lays the foundation for future measurements of this signal with higher signal-to-noise maps from ground-based telescopes, which will precisely probe the astrophysics of the intracluster medium of galaxy groups and clusters in the intermediate-mass ($M\\sim 10^{13} -10^{14} h^{-1} M_\\odot$), high-$z$ ($z<\\sim1.5$, c.f. $z<\\sim0.8$ for the tSZ auto-power signal) regime, as well as CIB-decontaminated measurements of tSZ cross-correlations with other large-scale structure probes.","url_abs":"https://arxiv.org/abs/2308.16260v1","url_pdf":"https://arxiv.org/pdf/2308.16260v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"cross-correlation-of-the-thermal-sunyaev-zel-1","repo_url":"https://github.com/fmccarthy/tsz_kappa_halomodel_classsz","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"cross-correlation-of-the-thermal-sunyaev-zel-1","repo_url":"https://github.com/jcolinhill/pyilc","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}