Calibration Concordance for Astronomical Instruments via Multiplicative Shrinkage
Calibration Concordance for Astronomical Instruments via Multiplicative Shrinkage
复制标题
通过乘法收缩对天文仪器进行校准一致性
DOI:
10.1080/01621459.2018.1528978
复制
发表时间:
2018
影响因子:
3.7
通讯作者:
Kashyap, Vinay L.
中科院分区:
文献类型:
--
作者:
Chen, Yang;Meng, Xiao-Li;Wang, Xufei;van Dyk, David A.;Marshall, Herman L.;Kashyap, Vinay L.
Calibration data are often obtained by observing several well-understood objects simultaneously with multiple instruments, such as satellites for measuring astronomical sources. Analyzing such data and obtaining proper concordance among the instruments is challenging when the physical source models are not well understood, when there are uncertainties in “known” physical quantities, or when data quality varies in ways that cannot be fully quantified. Furthermore, the number of model parameters increases with both the number of instruments and the number of sources. Thus, concordance of the instruments requires careful modeling of the mean signals, the intrinsic source differences, and measurement errors. In this article, we propose a log-Normal model and a more general log-tmodel that respect the multiplicative nature of the mean signals via a half-variance adjustment, yet permit imperfections in the mean modeling to be absorbed by residual variances. We present analytical solutions in the form of power shrinkage in special cases and develop reliable Markov chain Monte Carlo algorithms for general cases, both of which are available in the Python moduleCalConcordance. We apply our method to several datasets including a combination of observations ofactive galactic nuclei(AGN) and spectral line emission from thesupernova remnantE0102, obtained with a variety of X-ray telescopes such asChandra, XMM-Newton,Suzaku, andSwift. The data are compiled by theInternational Astronomical Consortium for High Energy Calibration. We demonstrate that our method provides helpful and practical guidance for astrophysicists when adjusting for disagreements among instruments. Supplementary materials for this article, including a standardized description of the materials available for reproducing the work, are available as an online supplement.
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发表时间:
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期刊:
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影响因子:
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