{"language":[{"iso":"eng"}],"intvolume":"       653","type":"journal_article","status":"public","oa_version":"Published Version","doi":"10.1086/508646","scopus_import":"1","article_type":"original","citation":{"ieee":"J. D. Younger, Z. Haiman, G. L. Bryan, and S. Wang, “Breaking cosmological degeneracies in galaxy cluster surveys with a physical model of cluster structure,” <i>The Astrophysical Journal</i>, vol. 653, no. 1. American Astronomical Society, pp. 27–42, 2006.","mla":"Younger, Joshua D., et al. “Breaking Cosmological Degeneracies in Galaxy Cluster Surveys with a Physical Model of Cluster Structure.” <i>The Astrophysical Journal</i>, vol. 653, no. 1, American Astronomical Society, 2006, pp. 27–42, doi:<a href=\"https://doi.org/10.1086/508646\">10.1086/508646</a>.","apa":"Younger, J. D., Haiman, Z., Bryan, G. L., &#38; Wang, S. (2006). Breaking cosmological degeneracies in galaxy cluster surveys with a physical model of cluster structure. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.1086/508646\">https://doi.org/10.1086/508646</a>","ama":"Younger JD, Haiman Z, Bryan GL, Wang S. Breaking cosmological degeneracies in galaxy cluster surveys with a physical model of cluster structure. <i>The Astrophysical Journal</i>. 2006;653(1):27-42. doi:<a href=\"https://doi.org/10.1086/508646\">10.1086/508646</a>","chicago":"Younger, Joshua D., Zoltán Haiman, Greg L. Bryan, and Sheng Wang. “Breaking Cosmological Degeneracies in Galaxy Cluster Surveys with a Physical Model of Cluster Structure.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2006. <a href=\"https://doi.org/10.1086/508646\">https://doi.org/10.1086/508646</a>.","short":"J.D. Younger, Z. Haiman, G.L. Bryan, S. Wang, The Astrophysical Journal 653 (2006) 27–42.","ista":"Younger JD, Haiman Z, Bryan GL, Wang S. 2006. Breaking cosmological degeneracies in galaxy cluster surveys with a physical model of cluster structure. The Astrophysical Journal. 653(1), 27–42."},"publication_status":"published","extern":"1","title":"Breaking cosmological degeneracies in galaxy cluster surveys with a physical model of cluster structure","abstract":[{"text":"It has been shown that in an idealized galaxy cluster survey, containing ≳10,000 clusters, statistical errors on dark energy and other cosmological parameters would be at the percent level. Furthermore, through ``self-calibration,'' parameters describing the mass-observable relation and cosmology could be simultaneously determined, although at a loss in accuracy by about an order of magnitude. Here we examine an alternative approach to self-calibration, in which a parameterized ab initio physical model is used to compute theoretical mass-observable relations from the cluster structure. As an example, we use a modified-entropy (``preheating'') model of the intracluster medium, with the history and magnitude of entropy injection as unknown input parameters. Using a Fisher matrix approach, we evaluate the expected simultaneous statistical errors on cosmological and cluster model parameters. We find that compared to a phenomenological parameterization of the mass-observable relation, our physical model yields significantly tighter constraints in both surveys and offers substantially improved synergy when the two surveys are combined. In a mock X-ray survey, we find statistical errors on the dark energy equation of state are a factor of 2 tighter than the phenomenological model, with Δw0 ~ 0.08 and its evolution, Δwa ≡ -Δdw/da ~ 0.23, with corresponding errors of Δw0 ~ 0.06 and Δwa ~ 0.17 from a mock Sunyaev-Zel'dovich (SZ) survey, both with Ncl ~ 2.2 × 104 clusters, while simultaneously constraining cluster model parameters to ≲10%. When the two surveys are combined, the constraints tighten to Δw0 ~ 0.03 and Δwa ~ 0.1, a 40% improvement over adding the individual experiment errors in quadrature and a factor of 2 improvement over the phenomenological model. This suggests that parameterized physical models of cluster structure would be useful when extracting cosmological constraints from SZ and X-ray cluster surveys.","lang":"eng"}],"oa":1,"quality_controlled":"1","day":"10","main_file_link":[{"url":"https://doi.org/10.1086/508646","open_access":"1"}],"date_updated":"2024-09-30T09:28:25Z","author":[{"last_name":"Younger","full_name":"Younger, Joshua D.","first_name":"Joshua D."},{"first_name":"Zoltán","full_name":"Haiman, Zoltán","id":"7c006e8c-cc0d-11ee-8322-cb904ef76f36","last_name":"Haiman"},{"full_name":"Bryan, Greg L.","first_name":"Greg L.","last_name":"Bryan"},{"first_name":"Sheng","full_name":"Wang, Sheng","last_name":"Wang"}],"publication_identifier":{"issn":["0004-637X","1538-4357"]},"year":"2006","article_processing_charge":"No","date_published":"2006-12-10T00:00:00Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","volume":653,"_id":"17766","date_created":"2024-09-06T09:52:54Z","publisher":"American Astronomical Society","publication":"The Astrophysical Journal","issue":"1","page":"27-42","month":"12"}