Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..390m&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
During the past decade photometric redshift (photo-z) determination for the extragalactic population has been drastically improved. This improvement has allow to close the gap between the several hundred thousand of objects per deg^2 detected in modern cosmological surveys and their identification through spectroscopic follow-ups. Only recently, a similar level of precision has been achieved for AGN as for normal galaxies. We characterize the efficiency of the ALHAMBRA survey to derive highly accurate photometric redshifts (photo-z) for the brightest of the AGN sample, the QSOs. This characterization is required before any further analysis whether it implies individual objects or statistical properties of the QSO population as a whole (e.g. luminosity functions). We present the results for the QSO photo-z calibration making use of the published spectroscopic information from other major cosmological surveys overlapping with ALHAMBRA (e.g. COSMOS, GOODS, SDSS, DEEP, SWIRE & AEGIS). With the appropriate selection of templates and priors, the analysis of the ALHAMBRA fields shows an excellent agreement between the spectro-z and photo-z, obtaining σ[Δ z/(1+z)] < 0.02 with a low fraction (<7%) of catastrophic failures.
Del Olmo Ascension
Husillos C.
Marquez Isabel
Masegosa Josefa
Matute I.
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