X-ray and Optical Simultaneous Studies of the Central Engine in Active Galactic Nuclei

2015 Fiscal Year Final Research Report

• Project/Area Number: 26800095
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Hirofumi Noda 国立研究開発法人理化学研究所, 仁科加速器研究センター, 基礎科学特別研究員 (50725900)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: X線天文学 / ブラックホール / 科学衛星 / 熱設計

Outline of Final Research Achievements

In order to examine states of accretion flows onto Super Massive Black Holes (SMBHs) in Seyfert galaxies, we conducted X-ray and optical simultaneous monitoring by utilizing the Suzaku satellite and Japanese ground-based telescopes. As a result, we obtained a possibility that when the amount of materials swallowed into a SMBH is small in a Sefyert, a standard accretion disk does not reach down to an event horizon of a SMBH, and a hot accretion flow is formed like the low/hard state of black hole binaries.
In parallel, we performed ground tests of instruments onboard the Japanese X-ray satellite Hitomi. For a month after its launch, we confirmed that the almost same performance as that in ground was achieved in the orbit.

Free Research Field

X線天文学