Sensitivity analysis of a galaxy formation model
Sensitivity analysis of a galaxy formation model
复制标题
星系形成模型的敏感性分析
DOI:
10.1093/mnras/stz3560
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发表时间:
2020
影响因子:
4.8
通讯作者:
Baugh C
中科院分区:
文献类型:
--
作者:
Baugh C
We present the first application of a variance-based sensitivity analysis (SA) to a model that aims to predict the evolution and properties of the whole galaxy population. SA is a well-established technique in other quantitative sciences, but is a relatively novel tool for the evaluation of astrophysical models. We perform a multiparameter exploration of theGALFORMsemi-analytic galaxy formation model, to compute how sensitive the present-dayK-band luminosity function is to varying different model parameters. The parameter space is scanned using a low-discrepancy sampling technique proposed by Saltelli. We first demonstrate the usefulness of the SA approach by varying just two model parameters, one that controls supernova feedback and the other the heating of gas by active galactic nucleus. The SA analysis matches our physical intuition regarding how these parameters affect the predictions for different parts of the galaxy luminosity function. We then use SA to compute Sobol’ sensitivity indices varying seven model parameters, connecting the variance in the model output to the variance in the input parameters. The sensitivity is computed in luminosity bins, allowing us to probe the origin of the model predictions in detail. We discover that the SA correctly identifies the least important and most important parameters. Moreover, the SA also captures the combined responses of varying multiple parameters at the same time. Our study marks a much needed step away from the traditional 'one-at-a-time' parameter variation often used in this area and improves the transparency of multiparameter models of galaxy formation.
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DOI:
10.1145/1874391.187410
发表时间:
1987-02
期刊:
ACM SIGSOFT Softw. Eng. Notes
影响因子:
--
作者:
Will Tribbey
通讯作者:
Will Tribbey
DOI:
10.1093/mnras/stz1216
发表时间:
2018-06
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
--
作者:
Andrew J Griffin;C. Lacey;V. Gonzalez-Perez;C. Lagos;C. Baugh;Nikos Fanidakis Icc Durham;Portsmouth;Perth;Mpia Heidelberg
通讯作者:
Andrew J Griffin;C. Lacey;V. Gonzalez-Perez;C. Lagos;C. Baugh;Nikos Fanidakis Icc Durham;Portsmouth;Perth;Mpia Heidelberg
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Andrew J Benson
通讯作者:
Andrew J Benson
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
Yu.L. Levitan;N. Markovich;S. Rozin;I. M. Soboĺ
通讯作者:
I. M. Soboĺ