2011/05/30 by Guilhem Lavaux, Michael J. Hudson · 232 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Cosmic microwave background #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Peculiar velocity #Physics #Redshift #Redshift survey #Sky #Universe #astro-ph.CO
paper · pdf · doi:10.1111/j.1365-2966.2011.19233.x
published in Monthly Notices of the Royal Astronomical Society 416(4), 2840-2856 (Oxford University Press) · 19 pages, 15 figures, 6 tables, submitted to MNRAS
arxiv created 2011/05/30 · openalex publication_date 2011/08/01 · arxiv updated 2015/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Peculiar velocities arise from gravitational instability, and thus are linked to the surrounding distribution of matter. In order to understand the motion of the Local Group with respect to the cosmic microwave background, a deep all-sky map of the galaxy distribution is required. Here we present a new redshift compilation of 69 160 galaxies, dubbed 2M++, to map large-scale structures of the local Universe over nearly the whole sky, and reaching depths of K≤ 12.5, or 200 h−1 Mpc. The target catalogue is based on the Two-Micron All-Sky Survey Extended Source Catalog (2MASS-XSC). The primary sources of redshifts are the 2MASS Redshift Survey, the 6dF galaxy redshift survey and the Sloan Digital Sky Survey (Data Release 7). We assess redshift completeness in each region and compute the weights required to correct for redshift incompleteness and apparent magnitude limits, and discuss corrections for incompleteness in the zone of avoidance. We present the density field for this survey, and discuss the importance of large-scale structures such as the Shapley Concentration.