Bayesian inference from photometric redshift surveys
Bayesian inference from photometric redshift surveys
复制标题
光度红移调查的贝叶斯推断
DOI:
10.1111/j.1365-2966.2012.21423.x
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发表时间:
2012
影响因子:
4.8
通讯作者:
Wandelt
中科院分区:
文献类型:
--
作者:
Wandelt
We show how to enhance the redshift accuracy of surveys consisting of tracers with highly uncertain positions along the line of sight. This increased redshift precision is achieved by imposing an isotropy and two-point correlation prior in a Bayesian analysis and is independent of the process that estimates the photometric redshift. In particular, our method can deal with arbitrary forms of redshift uncertainties for each galaxy. As a byproduct, the method also infers the three-dimensional density field, essentially super-resolving high-density regions in redshift space. Our method fully takes into account the survey mask and selection function. It uses a simplified Poissonian picture of galaxy formation, relating preferred locations of galaxies to regions of higher density in the matter field. The method quantifies the remaining uncertainties in the three-dimensional density field and the true radial locations of galaxies by generating samples that are constrained by the survey data. The exploration of this high-dimensional, non-Gaussian joint posterior is made feasible using multiple-block Metropolis–Hastings sampling. We demonstrate the performance of our implementation on a simulation containing 2 × 107galaxies. We further demonstrate the robustness of our method to prior misspecification by application to mock observations built from a large-scale structure simulation. In this test, initial Gaussian redshift uncertainties with δz∼ 0.03 can yield final redshift uncertainties of δzf∼ 0.003 in high-density regions. These results bear out the promise of Bayesian analysis for upcoming photometric large-scale structure surveys with tens of millions of galaxies.
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DOI:
10.1111/j.1365-2966.2009.16163.x
发表时间:
2009
影响因子:
4.8
作者:
F. Kitaura;J. Jasche;R. Metcalf
通讯作者:
R. Metcalf
DOI:
10.1086/424726
发表时间:
2004
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Huterer;A. Kim;L. Krauss;Tamara Broderick
通讯作者:
Tamara Broderick
DOI:
10.1111/j.1365-2966.2010.17122.x
发表时间:
2010
影响因子:
4.8
作者:
Cornelius Weig;T. Ensslin
通讯作者:
T. Ensslin
DOI:
10.1086/323227
发表时间:
2001
期刊:
The Astrophysical Journal
影响因子:
--
作者:
I. Kayo;A. Taruya;Y. Suto
通讯作者:
Y. Suto
DOI:
10.1007/978-94-009-4598-2_33
发表时间:
1986
期刊:
Astrophysics and space science library
影响因子:
--
作者:
D. Koo
通讯作者:
D. Koo