Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715005c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #150.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
1
Scientific paper
The project focuses on the calibration of photometric redshifts of luminous red galaxies within the DR8 imaging catalog of Sloan Digital Sky Survey. We aim to use the spectroscopic sample of BOSS galaxies and compare their (true) spectroscopic redshifts with photometric redshifts obtained from different techniques. We discuss the performance of photo-z estimation via template fitting of the spectral energy distribution and trained neural networks using ANNz. We also obtain the photometric redshift distributions of luminous red galaxies in different redshift bins and provide an analytical fit to these distributions. In this sense, we comment on the capabilities of ANNz to investigate the systematics involved in galaxy clustering measurements, such as spatial variations of the redshift distributions. The resulting photo-z catalogs are useful for the estimation of cosmological parameters through the evaluation of the power spectrum (Padmanabhan et al. 2007), which will benefit from large sky area covered by SDSS-III imaging sample.
Connolly Natalia
Cuesta-Vazquez Antonio Jose
da Costa Luiz N. A.
de Simoni F.
Ho Shirley
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