73 citations · 73 across the 2 of their papers we have counts for
6 papers
X-ray Echo from the Sagittarius C Complex and 500-year Activity History of Sagittarius A*
Syukyo Gando Ryu, Masayoshi Nobukawa, Shinya Nakashima +3
This paper presents the Suzaku results obtained for the Sagittarius (Sgr) C region using the concept of X-ray reflection nebulae (XRNe) as the echo of past flares from the super ma…
New Evidence for High Activity of the Super-Massive Black Hole in our Galaxy
Masayoshi Nobukawa, Syukyo G. Ryu, Takeshi Go Tsuru +1
Prominent K-shell emission lines of neutral iron (hereafter, FeI-K) and hard-continuum X-rays were found from molecular clouds (MCs) in the Sagittarius B (Sgr B) region with the tw…
The Suzaku Hard X-ray Survey on the Galactic Center Region
T. G. Tsuru, H. Uchiyama, M. Nobukawa +4
Diffuse X-rays from the Galactic center (GC) region were found to exhibit many K-shell lines from iron and nickel atoms in the 6--9 keV band. The strong emission lines seen in the…
Discovery of K-Shell Emission Lines of Neutral Atoms in the Galactic Center Region
Masayoshi Nobukawa, Katsuji Koyama, Takeshi Go Tsuru +2
The K-shell emission line of neutral irons from the Galactic center (GC) region is one of the key for the structure and activity of the GC. The origin is still open question, but p…
An X-Ray Face-on View of the Sgr B Molecular Clouds Observed with Suzaku
Syukyo G. Ryu, Katsuji Koyama, Masayoshi Nobukawa +2
We present a new methodology to derive the positions of the Sgr B molecular clouds (MCs) along the line of sight, as an application study of the Galactic center diffuse X-rays (GCD…
Suzaku Observation Adjacent to the South End of the Radio Arc
Ryosuke Fukuoka, Katsuji Koyama, Syukyo G. Ryu +1
Suzaku observed the Galactic center region near the Radio Arc at ~20' southeast of Sagittarius A*.In the 18'x18' field of view, we found four distinct X-ray sources: a bright star…