[{"citation":{"chicago":"Molnar, Sandor M., Zoltán Haiman, Mark Birkinshaw, and Richard F. Mushotzky. “Constraints on the Energy Content of the Universe from a Combination of Galaxy Cluster Observables.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2004. <a href=\"https://doi.org/10.1086/380295\">https://doi.org/10.1086/380295</a>.","short":"S.M. Molnar, Z. Haiman, M. Birkinshaw, R.F. Mushotzky, The Astrophysical Journal 601 (2004) 22–27.","ista":"Molnar SM, Haiman Z, Birkinshaw M, Mushotzky RF. 2004. Constraints on the energy content of the universe from a combination of galaxy cluster observables. The Astrophysical Journal. 601(1), 22–27.","mla":"Molnar, Sandor M., et al. “Constraints on the Energy Content of the Universe from a Combination of Galaxy Cluster Observables.” <i>The Astrophysical Journal</i>, vol. 601, no. 1, American Astronomical Society, 2004, pp. 22–27, doi:<a href=\"https://doi.org/10.1086/380295\">10.1086/380295</a>.","apa":"Molnar, S. M., Haiman, Z., Birkinshaw, M., &#38; Mushotzky, R. F. (2004). Constraints on the energy content of the universe from a combination of galaxy cluster observables. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.1086/380295\">https://doi.org/10.1086/380295</a>","ieee":"S. M. Molnar, Z. Haiman, M. Birkinshaw, and R. F. Mushotzky, “Constraints on the energy content of the universe from a combination of galaxy cluster observables,” <i>The Astrophysical Journal</i>, vol. 601, no. 1. American Astronomical Society, pp. 22–27, 2004.","ama":"Molnar SM, Haiman Z, Birkinshaw M, Mushotzky RF. Constraints on the energy content of the universe from a combination of galaxy cluster observables. <i>The Astrophysical Journal</i>. 2004;601(1):22-27. doi:<a href=\"https://doi.org/10.1086/380295\">10.1086/380295</a>"},"author":[{"full_name":"Molnar, Sandor M.","last_name":"Molnar","first_name":"Sandor M."},{"last_name":"Haiman","full_name":"Haiman, Zoltán","id":"7c006e8c-cc0d-11ee-8322-cb904ef76f36","first_name":"Zoltán"},{"last_name":"Birkinshaw","full_name":"Birkinshaw, Mark","first_name":"Mark"},{"first_name":"Richard F.","last_name":"Mushotzky","full_name":"Mushotzky, Richard F."}],"main_file_link":[{"url":"https://doi.org/10.1086/380295","open_access":"1"}],"extern":"1","intvolume":"       601","status":"public","language":[{"iso":"eng"}],"date_published":"2004-01-20T00:00:00Z","year":"2004","oa_version":"Published Version","doi":"10.1086/380295","abstract":[{"text":"We demonstrate that constraints on cosmological parameters from the distribution of clusters as a function of redshift (dN/dz) are complementary to accurate angular diameter distance (D_A) measurements to clusters, and their combination significantly tightens constraints on the energy density content of the Universe. The number counts can be obtained from X-ray and/or SZ (Sunyaev-Zel'dovich effect) surveys, and the angular diameter distances can be determined from deep observations of the intra-cluster gas using their thermal bremsstrahlung X-ray emission and the SZ effect. We combine constraints from simulated cluster number counts expected from a 12 deg^2 SZ cluster survey and constraints from simulated angular diameter distance measurements based on the X-ray/SZ method assuming a statistical accuracy of 10% in the angular diameter distance determination of 100 clusters with redshifts less than 1.5. We find that Omega_m can be determined within about 25%, Omega_Lambda within 20%, and w within 16%. We show that combined dN/dz + D_A constraints can be used to constrain the different energy densities in the Universe even in the presence of a few percent redshift dependent systematic error in D_A. We also address the question of how best to select clusters of galaxies for accurate diameter distance determinations. We show that the joint dN/dz + D_A constraints on cosmological parameters for a fixed target accuracy in the energy density parameters are optimized by selecting clusters with redshift upper cut--offs in the range 0.5 < z < 1.","lang":"eng"}],"publisher":"American Astronomical Society","article_processing_charge":"No","date_updated":"2024-09-25T13:08:12Z","type":"journal_article","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","article_type":"original","publication_status":"published","issue":"1","date_created":"2024-09-06T09:02:16Z","day":"20","publication_identifier":{"issn":["0004-637X","1538-4357"]},"quality_controlled":"1","volume":601,"oa":1,"page":"22-27","_id":"17717","publication":"The Astrophysical Journal","title":"Constraints on the energy content of the universe from a combination of galaxy cluster observables","scopus_import":"1","month":"01"}]