The VIMOS Public Extragalactic Redshift Survey (VIPERS)

Unbiased clustering estimate with VIPERS slit assignment^⋆

¹ INAF – Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano – via E. Bianchi 46, 23807 Merate, Italy
e-mail: faizan.mohammad@brera.inaf.it
² Università degli Studi di Milano, via G. Celoria 16, 20133 Milano, Italy
³ Institute for Cosmology and Gravitation, University of Portsmouth, 1-8 Burnaby Rd, Portsmouth PO1 3, UK
⁴ Department of Physics and Astronomy, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1, Canada
⁵ Perimeter Institute for Theoretical Physics, 31 Caroline St. North, Waterloo, ON N2L 2Y5, Canada
⁶ Aix-Marseille Université, Université Toulon, CNRS, CPT, Marseille, France
⁷ Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
⁸ INFN, Sezione di Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
⁹ INAF – Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio Catone (RM), Italy
¹⁰ Aix-Marseille Université, CNRS, CNES, LAM, Marseille, France
¹¹ Dipartimento di Fisica e Astronomia – Alma Mater Studiorum Università di Bologna, via Gobetti 93/2, 40129 Bologna, Italy
¹² INFN, Sezione di Bologna, viale Berti Pichat 6/2, 40127 Bologna, Italy
¹³ INAF – Osservatorio Astronomico di Bologna, via Gobetti 93/3, 40129 Bologna, Italy
¹⁴ INAF – Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via Bassini 15, 20133 Milano, Italy
¹⁵ INAF – Osservatorio Astrofisico di Torino, 10025 Pino Torinese, Italy
¹⁶ Laboratoire Lagrange, UMR7293, Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, 06300 Nice, France
¹⁷ Institute of Physics, Jan Kochanowski University, ul. Swietokrzyska 15, 25-406 Kielce, Poland
¹⁸ National Centre for Nuclear Research, ul. Hoza 69, 00-681 Warszawa, Poland
¹⁹ Aix-Marseille Université, Jardin du Pharo, 58 bd Charles Livon, 13284 Marseille Cedex 7, France
²⁰ IRAP, 9 av. du colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France
²¹ Astronomical Observatory of the Jagiellonian University, Orla 171, 30-001 Cracow, Poland
²² School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK
²³ INAF – Istituto di Astrofisica Spaziale e Fisica Cosmica Bologna, via Gobetti 101, 40129 Bologna, Italy
²⁴ INAF – Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
²⁵ Canada-France-Hawaii Telescope, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USA
²⁶ Department of Astronomy, University of Geneva, ch. d’Ecogia 16, 1290 Versoix, Switzerland
²⁷ INAF – Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34143 Trieste, Italy
²⁸ Department of Astronomy & Physics, Saint Mary’s University, 923 Robie Street, Halifax Nova Scotia B3H 3C3, Canada

Received: 13 July 2018
Accepted: 6 August 2018

Abstract

The VIPERS galaxy survey has measured the clustering of 0.5 < z < 1.2 galaxies, enabling a number of measurements of galaxy properties and cosmological redshift-space distortions (RSD). Because the measurements were made using one-pass of the VIMOS instrument on the Very Large Telescope (VLT), the galaxies observed only represent approximately 47% of the parent target sample, with a distribution imprinted with the pattern of the VIMOS slitmask. Correcting for the effect on clustering has previously been achieved using an approximate approach developed using mock catalogues. Pairwise inverse probability (PIP) weighting has recently been proposed to correct for missing galaxies, and we apply it to mock VIPERS catalogues to show that it accurately corrects the clustering for the VIMOS effects, matching the clustering measured from the observed sample to that of the parent. We then apply PIP-weighting to the VIPERS data, and fit the resulting monopole and quadrupole moments of the galaxy two-point correlation function with respect to the line-of-sight, making measurements of RSD. The results are close to previous measurements, showing that the previous approximate methods used by the VIPERS team are sufficient given the errors obtained on the RSD parameter.