New insights on the accuracy of photometric redshift measurements

Details New insights on the accuracy of photometric redshift measurements New insights on the accuracy of photometric redshift measurements

2001-10-12

arxiv.org/abs/astro-ph/0110292v1

Astronomy and Astrophysics

Astrophysics

18 pages, 9 encapsulated postscript figures, LateX, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20011409

We use the deepest and most complete redshift catalog currently available (the Hubble Deep Field (HDF) North supplemented by new HDF South redshift data) to minimize residuals between photometric and spectroscopic redshift estimates. The good agreement at z_spec < 1.5 shows that model libraries provide a good description of the galaxy population. At z_spec > 2.0, the systematic shift between photometric and spectroscopic redshifts decreases when the modeling of the absorption by the interstellar and intergalactic media is refined. As a result, in the entire redshift range 0 < z < 6, residuals between photometric and spectroscopic redshifts are roughly halved. For objects fainter than the spectroscopic limit, the main source of uncertainty in photometric redshifts is related to photometric errors, and can be assessed with Monte Carlo simulations.

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