Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733405d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #334.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We use the deepest and the most comprehensive photometric data currently available for GOODS-South and GOODS-North galaxies to measure their photometric redshifts. The photometry spans a wave-length range from the U-band to infrared Spitzer data. The catalogs are selected in the HST/ACS z-band (F850LP) and photometry in each band is carried out using the recently completed TFIT algorithm, which performs PSF matched photometry uniformly across different instruments and filters, despite large variations in PSFs and pixel scales. Photometric redshifts are derived using the GOODZ code, which is based on the template fitting method using priors. The code also implements "training" of the template SED set, using available spectroscopic redshifts in order to minimize systematic differences between the templates and the SEDs of the observed galaxies. The scatter between our estimated photometric and spectroscopic redshifts is sigma 0.04. This is consistent with the best results previously published for GOODS-S galaxies, however, the present catalog is the deepest yet available and provides photometric redshifts for significantly more objects to deeper flux limits and higher redshifts than earlier works. Furthermore, we show that the photometric redshifts estimated here for galaxies selected as dropouts are consistent with those expected based on the Lyman break technique. Extensive comparisons between the methods are presented.
Dahlen Tomas
Mobasher Bahram
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