Precise photometric redshifts with a narrow-band filter set: The PAU survey at the William Herschel Telescope

P. Martí, R. Miquel, F. J. Castander, E. Gaztañaga, M. Eriksen, C. Sánchez

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    35 Citations (Scopus)

    Abstract

    The Physics of the Accelerating Universe (PAU) survey at the William Herschel Telescope will use a new optical camera (PAUCam) with a large set of narrow-band filters to perform a photometric galaxy survey with a quasi-spectroscopic redshift precision of σ(z)/(1 + z) ~ 0.0035 and map the large-scale structure of the universe in three dimensions up to iAB < 22.5-23.0. In this paper, we present a detailed photo-z performance study using photometric simulations for 40 equally spaced 12.5-nm-wide (full width at half-maximum) filters with an ~25 per cent overlap and spanning the wavelength range from 450 to 850 nm, together with a ugrizY broad-band filter system. We then present the migration matrix rij, containing the probability that a galaxy in a true redshift bin j is measured in a photo-z bin i, and study its effect on the determination of galaxy auto-and cross-correlations. Finally, we also study the impact on the photo-z performance of small variations of the filter set in terms of width, wavelength coverage, etc., and find a broad region where slightly modified filter sets provide similar results, with the original set being close to optimal. © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Original languageEnglish
    Pages (from-to)92-109
    JournalMonthly Notices of the Royal Astronomical Society
    Volume442
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2014

    Keywords

    • Galaxies: distances and redshifts
    • Galaxies: statistics
    • Large-scale structure of universe
    • Surveys

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