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Final public release of complete VIPERS galaxy catalogue of ~90,000 redshifts (PDR-2)
- 18 November 2016 -

Go to PDR-2 Data Download Page

The unprecedented view of the large-scale distribution of galaxies between 5 and 8 billion years ago, unveiled by the new ~55,000 redshifts of the VIPERS PDR-1 catalogue (publicly released in March 2013). The survey targets galaxies with a magnitude i(AB)<22.5 over two areas of ~16 and 8 square degree of sky, within the two CFHTLS Wide W1 and W4 fields. The extensive coverage and high sampling density of the survey deliver a stunning picture of the cosmic web at an epoch when the Universe was about half its current age. The long side of the "cones" extends from z=0.45 to z=0.95, spanning 4.6 billion light years in co-moving length.

The "VIMOS Public Extragalactic Redshift Survey" (VIPERS) is a completed ESO Large Program that has mapped in detail the spatial distribution of normal galaxies over an unprecedented volume of the z~1 Universe. It used the VIMOS spectrograph at the 8~m Very Large Telescope to measured spectra for more than 90,000 galaxies with red magnitude I(AB) brighter than 22.5 over an overall area of nearly 24 square degrees. At this redshift, VIPERS fills a unique niche in galaxy surveys, optimizing the combination of multi-band accurate photometry (5 bands from the CFHT-LS, plus Galex-NUV and NIR from WIRCAM and other facilities over most of the area) with the multiplexing capability of VIMOS. A robust color-color pre-selection allowed the survey to focus on the 0.5 < z < 1.2 redshift range, yielding an optimal combination of large volume (5 x 107 h-3 Mpc3) and high effective spectroscopic sampling (46% on average). VIPERS has produced a data set that in many respects represents for the first time the equivalent at z~1 of the large surveys of the "local" (z<0.2) Universe built at the beginning of this century (SDSS and 2dFGRS).

VIPERS scientific investigations are focuing on measurements of large-scale structure and cosmological parameters at an epoch when the Universe was about half its current age. At the same time, the survey is exploring the ensemble properties of galaxies with unprecedented statistical accuracy at these redshifts, providing the natural extension back in time to classical results from the SDSS.

Previous release (PDR-1, 2013) data download Page

Learn more about the project (semi-technical)
Webmaster: Paolo Franzetti  - Web Design: Fabio Guzzo