2015/07/31 by Ginevra Favole, Johan Comparat, Francisco Prada +18 · 2 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Physics #Redshift #Scientific Research and Discoveries #Sky #astro-ph.CO #astro-ph.GA #msc:85A05 #msc:85A40
paper · pdf · doi:10.1093/mnras/stw1483
published as MNRAS (2016), 461, 3421 · 11 pages, 7 figures, 2 tables
openalex publication_date 2016/06/21 · openalex created_date 2016/06/24 · arxiv created 2016/07/26 · arxiv updated 2016/07/28 · openalex updated_date 2026/08/05
Current and future large redshift surveys, as the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (SDSS-IV/eBOSS) or the Dark Energy Spectroscopic Instrument (DESI), will use emission-line galaxies (ELGs) to probe cosmological models by mapping the large-scale structure of the Universe in the redshift range 0.6 < z < 1.7. With current data, we explore the halo–galaxy connection by measuring three clustering properties of g-selected ELGs as matter tracers in the redshift range 0.6 < z < 1: (i) the redshift-space two-point correlation function using spectroscopic redshifts from the BOSS ELG sample and VIPERS; (ii) the angular two-point correlation function on the footprint of the CFHT-LS; (iii) the galaxy–galaxy lensing signal around the ELGs using the CFHTLenS. We interpret these observations by mapping them on to the latest high-resolution MultiDark Planck N-body simulation, using a novel (Sub)Halo-Abundance Matching technique that accounts for the ELG incompleteness. ELGs at z ∼ 0.8 live in haloes of (1 ± 0.5) × 1012 h−1M⊙ and 22.5 ± 2.5 per cent of them are satellites belonging to a larger halo. The halo occupation distribution of ELGs indicates that we are sampling the galaxies in which stars form in the most efficient way, according to their stellar-to-halo mass ratio.