On a novel approach using massive clusters at high redshifts as cosmological probe
On a novel approach using massive clusters at high redshifts as cosmological probe
复制标题
使用高红移大质量星团作为宇宙学探测器的新方法
DOI：
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
L. Moscardini
中科院分区：
文献类型：
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作者：
Jean;S. Ettori;L. Moscardini;L. Moscardini
在这项工作中，我们提出了一种新的方法来测试基准Λ冷暗物质（ΛCDM）宇宙学的有效性，方法是测量在固定红移的天空上平铺的相同大小的子体积样本中最大质量晕的累积分布函数。事实上，质量最大的星团探测的是质量函数的高质量尾部，在那里ΛCDM和其他宇宙学模型之间的差异是最大的，这使得我们的方法作为一种宇宙学探测器特别有趣。我们利用一般极值（GEV）统计来获得给定体积中最大质量物体的累积分布函数。我们根据调查区域所覆盖的斑块数量对这个分布函数进行采样，以用于一系列不同的“测试宇宙学”和对晕的不同精确质量估计。通过将该样本与GEV分布函数拟合，我们可以研究哪些参数对测试宇宙学最敏感。我们发现，一旦我们能够在z= 1 （z= 1.5）以上的红移处建立一个足够完整的Mlim≃1014.5 M⊙h−1 （Mlim≃1014 M⊙h−1）的大范围调查，那么最大质量光晕的概率分布函数的峰值非常适合于测试基准ΛCDM模型的有效性。由于具有累积性质，所提议的测量方法是可靠的，在星团质量中达到20 - 30%的准确度就足以测试其他模型。由于在每个角度斑块中只需要最大质量的系统，因此这种方法非常适合作为对观察到的光晕样本进行更复杂的统计分析之前的第一次快速一致性检查。
In this work we propose a novel method for testing the validity of the fiducial Λ cold dark matter (ΛCDM) cosmology by measuring the cumulative distribution function of the most massive haloes in a sample of subvolumes of identical size tiled on the sky at a fixed redshift. The fact that the most massive clusters probe the high-mass tail of the mass function, where the difference between ΛCDM and alternative cosmological models is strongest, makes our method particularly interesting as a cosmological probe. We utilize general extreme value (GEV) statistics to obtain a cumulative distribution function of the most massive objects in a given volume. We sample this distribution function according to the number of patches covered by the survey area for a range of different ‘test cosmologies’ and for differently accurate mass estimations of the haloes. By fitting this sample with the GEV distribution function, we can study which parameters are the most sensitive with respect to the test cosmologies. We find that the peak of the probability distribution function of the most massive halo is well suited to test the validity of the fiducial ΛCDM model, once we are able to establish a sufficiently complete large-area survey with Mlim≃ 1014.5 M⊙ h−1 (Mlim≃ 1014 M⊙ h−1) at redshifts above z= 1 (z= 1.5). Being of cumulative nature the proposed measure is robust and an accuracy of 20–30 per cent in the cluster masses would be sufficient to test for alternative models. Since one only needs the most massive system in each angular patch, this method would be ideally suited as a first fast consistency check before going into a more complex statistical analysis of the observed halo sample.
影响因子：
6.5
作者：
P. Rosati;P. Tozzi;R. Gobat;Joana S. Santos;M. Nonino;R. Demarco;C. Lidman;C. Lidman;C. Mullis;V. Strazzullo;H. Böhringer;R. Fassbender;Kyle S. Dawson;Masayuki Tanaka;J. Jee;H. Ford;G. Lamer;A. Schwope
通讯作者：
P. Rosati;P. Tozzi;R. Gobat;Joana S. Santos;M. Nonino;R. Demarco;C. Lidman;C. Lidman;C. Mullis;V. Strazzullo;H. Böhringer;R. Fassbender;Kyle S. Dawson;Masayuki Tanaka;J. Jee;H. Ford;G. Lamer;A. Schwope
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.
DOI：
10.1088/0004-637x/704/1/672
发表时间：
2009-08
期刊：
The Astrophysical Journal
影响因子：
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作者：
Myung-Kook Jee;P. Rosati;H. Ford;K. Dawson;C. Lidman;S. Perlmutter;R. Demarco;V. Strazzullo;C. Mullis;H. Böhringer;R. Fassbender
通讯作者：
Myung-Kook Jee;P. Rosati;H. Ford;K. Dawson;C. Lidman;S. Perlmutter;R. Demarco;V. Strazzullo;C. Mullis;H. Böhringer;R. Fassbender