منابع مشابه
Photometric Redshift Estimation Using Spectral Connectivity Analysis
The development of fast and accurate methods of photometric redshift estimation is a vital step towards being able to fully utilize the data of next-generation surveys within precision cosmology. In this paper we apply a specific approach to spectral connectivity analysis (SCA; Lee & Wasserman 2009) called diffusion map. SCA is a class of nonlinear techniques for transforming observed data (e.g...
متن کاملAccurate Redshift Estimation from Photometric Colors
Accurate distance measurements are vital to observational cosmology. When we detect an object like a galaxy, a common proxy quantity for its line-of-sight distance (as well as “look-back” time) from us is its cosmological redshift: the shifting to redder wavelengths of the electromagnetic spectra of very distant objects (often galaxies) due to the expansion of the universe as light travels towa...
متن کاملPhotometric redshift estimation using Gaussian processes
We present a comparison between Gaussian processes (GPs) and artificial neural networks (ANNs) as methods for determining photometric redshifts for galaxies, given training set data. In particular, we compare their degradation in performance as the training set size is degraded in ways which might be caused by the observational limitations of spectroscopy. Using publicly-available regression co...
متن کاملA Sparse Gaussian Process Framework for Photometric Redshift Estimation
Accurate photometric redshift are a lynchpin for many future experiments to pin down the cosmological model and for studies of galaxy evolution. In this study, a novel sparse regression framework for photometric redshift estimation is presented. Data from a simulated survey was used to train and test the proposed models. We show that approaches which include careful data preparation and model d...
متن کاملSupport Vector Machines for Photometric Redshift Estimation from Broadband Photometry
Photometric redshifts have been regarded as efficient and effective measures for studying the statistical properties of galaxies and their evolution. In this paper, we introduce SVM_Light, a freely available software package using support vector machines (SVM) for photometric redshift estimation. This technique shows its superiorities in accuracy and efficiency. It can be applied to huge volume...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X,1538-4357
DOI: 10.1086/308947