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http://hdl.handle.net/20.500.12386/24657
Titolo: | The amazing diversity in the hot gas content of an X-ray unbiased massive galaxy clusters sample | Autori: | ANDREON, Stefano Serra, Ana Laura MORETTI, Alberto TRINCHIERI, Ginevra |
Data pubblicazione: | 2016 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 585 | Da pagina:: | A147 | Abstract: | We aim to determine the intrinsic variety, at a given mass, of the properties of the intracluster medium in clusters of galaxies. This requires a cluster sample selected independently of the intracluster medium content for which reliable masses and subsequent X-ray data can be obtained. We present one such sample, consisting of 34 galaxy clusters selected independently of their X-ray properties in the nearby (0.050 < z < 0.135) Universe and mostly with 14 < log M<SUB>500</SUB>/M<SUB>☉</SUB> ≲ 14.5, where masses are dynamically estimated. We collected the available X-ray observations from the archives and then observed the remaining clusters with the low-background Swift X-ray telescope, which is extremely useful for sampling a cluster population expected to have low surface brightness. We found that clusters display a large range (up to a factor 50) in X-ray luminosities within r<SUB>500</SUB> at a given mass, whether or not the central emission (r < 0.15 r<SUB>500</SUB>) is excised, unveiling a wider cluster population than seen in Sunayev-Zeldovich surveys or inferred from the population seen in X-ray surveys. The measured dispersion is 0.5 dex in L<SUB>X</SUB> at a given mass. | URI: | http://hdl.handle.net/20.500.12386/24657 | URL: | https://www.aanda.org/articles/aa/abs/2016/01/aa27408-15/aa27408-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201527408 | Bibcode ADS: | 2016A&A...585A.147A | Fulltext: | open |
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