Constraining the spin of Sgr A* via the motion of the S-stars

2017 Fiscal Year Final Research Report

• Project/Area Number: 26800150
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Wakayama National College of Technology
• Principal Investigator: TAKAMORI Yohsuke 和歌山工業高等専門学校, 総合教育科, 准教授 (30613153)
• Research Collaborator: SAIDA Hiromi 大同大学, 教養部, 准教授 (80367648) ; NISHIYAMA Shogo 宮城教育大学, 教育学部, 准教授 (20377948) ; TAKAHASHI Masaaki 愛知教育大学, 教育学部, 教授 (30242895)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 超大質量ブラックホール / 天の川銀河 / ブラックホールスピン / 見えない質量

Outline of Final Research Achievements

We have observed the radial velocity of S2, which is one of S-stars, with Subaru telescope since 2014. As a result, we could have determined the radial velocity of S2 with high accuracy thanks to Subaru telescope. In addition, We have calculated the influence on the radial velocity of S2 due to dark masses around Sgr A*. We have found that 1 % dark masses of Sgr A*, that is the present upper limit, affect the radial velocity of S2 as at most 1000km/s when S2 goes through pericenter.

Free Research Field

宇宙物理学