Accidental deep field bias in CMB T and SNe z correlation
Accidental deep field bias in CMB T and SNe z correlation
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CMB T 和 SNe z 相关性中的意外深场偏差
DOI：
10.1093/mnras/sty1395
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发表时间：
2018
影响因子：
4.8
通讯作者：
Friday T
中科院分区：
文献类型：
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作者：
Friday T
Yerhov、Orlov和Raikov提出的证据显然表明，超新星(SNE)位置的WMAP/Planck宇宙微波背景(CMB)像素温度(T)随着红移()的增加而增加。他们认为，这种关联可能是由整合的萨克斯-沃尔夫效应和/或一些无关的前景发射引起的。在这里，我们使用Planck2015 SMICA R2.01数据和Yershov等人的2783个来自Sternberg天文研究所的SNE样本独立地评估了这种相关性。我们的分析支持这种相关性的初步存在，但将其归因于7个深部调查场与CMB热点意外对准而导致的复合选择偏差(高CMBT×高SNE)。这七个油田包含9.2%的 样本(256SNE)。Spearman的秩次相关系数表明，在整个样本中存在的相关性(ρS=10.5，p值=10.7×−9)对于七个场的子样本(ρS=0.02，p值=0.02)是不显著的，而对于SNE的其余部分完全没有相关性(ρS=0.01，p值=0.06)。我们证明了这七个深场的温度和红移偏差，并估计它们偶然落在中巴热点上的可能性至少为6.8%∼ %(约十五分之一)。我们发现，来自Open超新星星表的7880个SNE样本显示了同样的效果，我们得出结论，这种关联是偶然的，但并非不可能的选择偏差。
Evidence presented by Yershov, Orlov, and Raikov apparently showed that theWMAP/Planckcosmic microwave background (CMB) pixel-temperatures (T) at supernovae (SNe) locations tend to increase with increasing redshift (). They suggest this correlation could be caused by the Integrated Sachs–Wolfe effect and/or by some unrelated foreground emission. Here, we assess this correlation independently usingPlanck2015 SMICA R2.01 data and, following Yershov et al., a sample of 2783 SNe from the Sternberg Astronomical Institute. Our analysis supports the prima facie existence of the correlation, but attributes it to a composite selection bias (high CMBT× high SNe) caused by the accidental alignment of seven deep survey fields with CMB hotspots. These seven fields contain 9.2 per cent of the SNe sample (256 SNe). Spearman’s rank-order correlation coefficient indicates the correlation present in the whole sample (ρs= 0.5,p-value = 6.7 × 10−9) is insignificant for a sub-sample of the seven fields together (ρs= 0.2,p-value = 0.2) and entirely absent for the remainder of the SNe (ρs= 0.1,p-value = 0.6). We demonstrate the temperature and redshift biases of these seven deep fields, and estimate the likelihood of their falling on CMB hotspots by chance is at least ∼6.8 per cent (approximately 1 in 15). We show that a sample of 7880 SNe from the Open Supernova Catalogue exhibits the same effect and we conclude that the correlation is an accidental but not unlikely selection bias.
钱德拉深场南：1Msec 目录
DOI：
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发表时间：
2001
期刊：
影响因子：
--
作者：
R. Giacconi;A. Zirm;J. Wang;P. Rosati;M. Nonino;P. Tozzi;R. Gilli;V. Mainieri;G. Hasinger;L. Kewley;J. Bergeron;S. Borgani;R. Gilmozzi;N. Grogin;A. Koekemoer;E. Schreier;W. Zheng;C. Norman
通讯作者：
C. Norman