The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX II)
The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX II)
复制标题
扩展的 ROSAT-ESO 通量限制 X 射线星系团巡天 (REFLEX II)
DOI：
10.1051/0004-6361/201731205
复制
发表时间：
2017
影响因子：
6.5
通讯作者：
Fukugita Masataka
中科院分区：
文献类型：
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作者：
Boehringer Hans;Chon Gayoung;Fukugita Masataka
星系团的质量函数是宇宙大尺度结构引力演化的灵敏示踪，是大结构中束缚物质比例的重要普查。我们通过将反射星系团观测到的星系团X射线光度分布拟合到宇宙结构形成的模型来得到质量函数。我们忽略了宇宙学参数以及相关星系团标度关系中的不确定性。在3×10~(12)~5×10~(14)M⊙的质量范围内，质量函数的测量不确定度小于10%。对于累积质量函数，我们发现低质量端的斜率与−1的值一致，而富质量端的截止值比指数项EXP(−Mδ)的谢克特函数温和，δ小于1。在H0=67−73 km S-1Mpc-1范围内改变哈勃参数，或者允许总中微子质量在0−0.4 eV范围内，引起的变化小于不确定度。我们估计了被锁在星系团中的质量的比例：在目前的宇宙中，大约4.4%的物质被束缚在质量大于1014M⊙的星系团(Insider200)中，14%被束缚在质量大于1013M⊙的星系团和星团中。我们还讨论了具有红移的星系团种群的演化。我们的结果表明，红移Z=1以上几乎没有质量≥为1015M⊙的星系团。
The mass function of galaxy clusters is a sensitive tracer of the gravitational evolution of the cosmic large-scale structure and serves as an important census of the fraction of matter bound in large structures. We obtain the mass function by fitting the observed cluster X-ray luminosity distribution from the REFLEX galaxy cluster survey to models of cosmological structure formation. We marginalise over uncertainties in the cosmological parameters as well as those of the relevant galaxy cluster scaling relations. The mass function is determined with an uncertainty of less than 10% in the mass range 3 × 1012to 5 × 1014M⊙. For the cumulative mass function we find a slope at the low-mass end consistent with a value of − 1, while the mass-rich end cut-off is milder than a Schechter function with an exponential term exp( −Mδ) withδsmaller than 1. Changing the Hubble parameter in the rangeH0= 67 − 73 km s-1Mpc-1or allowing the total neutrino mass to have a value in the range 0 − 0.4 eV causes variations less than the uncertainties. We estimate the fraction of mass locked up in galaxy clusters: about 4.4% of the matter in the Universe is bound in clusters (insider200) with a mass larger than 1014M⊙and 14% to clusters and groups with a mass larger than 1013M⊙at the present Universe. We also discuss the evolution of the galaxy cluster population with redshift. Our results imply that there is hardly any clusters with a mass ≥1015M⊙above a redshift ofz= 1.