Study of galaxy formation history and precise cosmology by SDSS massive spectroscopic survey

2014 Fiscal Year Final Research Report

• Project/Area Number: 22340050
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: YASUDA Naoki 東京大学, カブリ数物連携宇宙研究機構, 教授 (80333277)
• Co-Investigator(Renkei-kenkyūsha): AIHARA Hiroaki 東京大学, 理学系研究科, 教授 (60167773) ; TAKADA Masahiro 東京大学, カブリ数物連携宇宙研究機構, 教授 (40374889) ; YOSHIDA Naoki 東京大学, 理学系研究科, 教授 (90377961) ; SHIMASAKU Kazuhiro 東京大学, 理学系研究科, 准教授 (00251405) ; DOI Mamoru 東京大学, 理学系研究科, 教授 (00242090)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 宇宙物理 / 光学赤外線天文学

Outline of Final Research Achievements

The origin of the universe and how the universe has evolved are imprinted in the distribution of the galaxies. We have joined Sloan Digital Sky Survey III and taken spectrum of 1.5 million galaxies up to redshift of 0.7 distributed over 10,000 square degrees on the sky. The measurement of Baryon Acoustic Oscillation (sound wave scale at cosmic recombination) scale based on this dataset determined the distance to redshift 0.57 (~6 billion light-years) with 1% accuracy. This measurement confirms the universe is a flat universe with cosmological constant. The simultaneous analysis of the weak lensing signal together with galaxy clustering information give us the galaxy and dark matter halo relation and the cosmological parameters without degeneracy.

Free Research Field

宇宙物理学