The Optical/Near-Infrered Universe at Low and High Redshift

Details The Optical/Near-Infrered Universe at Low and High Redshift The Optical/Near-Infrered Universe at Low and High Redshift

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...193.7516b&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #75.16; Bulletin of the American Astronomical Society, Vol. 31, p.662

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Photometric redshift estimation is used extensively to obtain redshift information for galaxies where spectroscopic measurements are not possible. The major shortcoming of these methods is the lack of reliable spectral energy distributions. Empirical SEDs only exist for a small number of galaxies, in a limited wavelength range. Model based SEDs span a broader wavelength range, but usually give worse results than the empirical ones, largely due to uncertainties in the UV part of the spectrum. We present a novel technique for the self-consistent estimation of galaxy spectral energy distributions from a catalog with both broadband multicolor photometry and spectroscopic redshifts. These empirical SED templates can then be used in the photometric redshift estimation procedure for objects in other catalogs. Here we present the SED templates resulting from our technique when applied to the recent HDF/NICMOS catalog. The reconstructed SEDs are similar to model based templates, they reproduce the well known continuum features like starburst on the blue end or the 4000 Angstroms break. The photometric redshift estimation with the new templates gives smaller errors than the estimates with model or empirical spectra. We also use the tempates to generate an improved photometric redshift catalog of the whole HDF, and use it for quantifying the evolution of galaxy clustering and star formation with redshift.

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