Improved Photometric Redshifts with Surface Brightness Priors

Details Improved Photometric Redshifts with Surface Brightness Priors Improved Photometric Redshifts with Surface Brightness Priors

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113221x&link_type=abstract

American Astronomical Society, AAS Meeting #211, #132.21; Bulletin of the American Astronomical Society, Vol. 39, p.965

Mathematics

Probability

Scientific paper

We apply Bayesian statistics and prior probabilities of galaxy surface brightness to improve photometric redshift estimation. We first estimate the spectro-photometric redshifts (SPZs) for all 1873 galaxies for which we have ground-based spectroscopic redshifts. The spectro-photometric redshifts are based on the grism spectra, which cover a wavelength range of 6000-9000 Angstroms, combined with (U)BViz(JHK) broad-band photometry in the GOODS fields (Cohen et al. 2007, Ryan et al. 2007). The addition of the prior probability of surface brightness reduces redshift uncertainties by a factor of two to three. It also reduces the number of catastrophic outliers. Finally, we apply the improved redshift estimator to the full PEARS sample.

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