%0 Generic %1 marti2014precise %A Martí, Pol %A Miquel, Ramon %A Castander, Francisco J. %A Gaztañaga, Enrique %A Eriksen, Martin %A Sánchez, Carles %D 2014 %K pau photometric redhsift survey %T Precise photometric redshifts with a narrow-band filter set: The PAU Survey at the William Herschel Telescope %U http://arxiv.org/abs/1402.3220 %X The Physics of the Accelerating Universe (PAU) survey at the William Herschel Telescope (WHT) 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 \sigma(z)/(1 + z) ~ 0.0035 and map the large-scale structure of the universe in three dimensions up to i_AB < 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 (FWHM) filters with a ~25% overlap and spanning the wavelength range from 450 nm to 850 nm, together with a ugrizY broad-band filter system. We then present the migration matrix r_ij, 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.

@misc{marti2014precise, abstract = {The Physics of the Accelerating Universe (PAU) survey at the William Herschel Telescope (WHT) 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 \sigma(z)/(1 + z) ~ 0.0035 and map the large-scale structure of the universe in three dimensions up to i_AB < 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 (FWHM) filters with a ~25% overlap and spanning the wavelength range from 450 nm to 850 nm, together with a ugrizY broad-band filter system. We then present the migration matrix r_ij, 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.}, added-at = {2014-02-14T10:59:38.000+0100}, author = {Martí, Pol and Miquel, Ramon and Castander, Francisco J. and Gaztañaga, Enrique and Eriksen, Martin and Sánchez, Carles}, biburl = {https://www.bibsonomy.org/bibtex/2869730dfe1db32dbe9e235ce9c9960eb/miki}, description = {[1402.3220] Precise photometric redshifts with a narrow-band filter set: The PAU Survey at the William Herschel Telescope}, interhash = {5ae9fc2baf151ce4ba3572fabaaf9a36}, intrahash = {869730dfe1db32dbe9e235ce9c9960eb}, keywords = {pau photometric redhsift survey}, note = {cite arxiv:1402.3220Comment: Submitted to MNRAS. 19 pages, 18 figures, 6 tables}, timestamp = {2014-02-14T10:59:38.000+0100}, title = {Precise photometric redshifts with a narrow-band filter set: The PAU Survey at the William Herschel Telescope}, url = {http://arxiv.org/abs/1402.3220}, year = 2014 }