Predicting photometric redshifts with polynomial regression

Dan Wang; Yan-xia Zhang; Yong-heng Zhao

doi:10.1117/12.788443

15 July 2008 Predicting photometric redshifts with polynomial regression

Dan Wang, Yan-xia Zhang, Yong-heng Zhao

Proceedings Volume 7019, Advanced Software and Control for Astronomy II; 70193A (2008) https://doi.org/10.1117/12.788443
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The Sloan Digital Sky Survey (SDSS) is an ambitious photometry and spectra project, providing huge and abundant samples for photometric redshift estimation. We employ polynomial regression to estimate photometric redshifts using 330,000 galaxies with known spectroscopic redshifts from SDSS Release Four spectroscopic catalog, and compare three polynomial regressionmethods, i.e. linear regression, quadratic regression and cubic regression with different samples. This technique gives absolute convergence in a finite number of steps, represents better fit with fewer coefficients and yields the result as a mathematical expression. This method is much easier to use and understand than other empirical methods for astronomers. Our result indicates that equally or more powerful accuracy is provided, moreover, the best r.m.s. dispersion of this approach is 0.0256. In addition, the comparison between our results with other works is addressed.

Citation Download Citation

Dan Wang, Yan-xia Zhang, and Yong-heng Zhao "Predicting photometric redshifts with polynomial regression", Proc. SPIE 7019, Advanced Software and Control for Astronomy II, 70193A (15 July 2008); https://doi.org/10.1117/12.788443

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