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122 papers
Evolution of Accretion Disk Structure of the Black Hole X-ray Binary MAXI J1820070 during the Rebrightening Phase
Tomohiro Yoshitake, Megumi Shidatsu, Yoshihiro Ueda +18
To understand the evolution of global accretion disk structure in the ``rebrightening'' phase of MAXI J1820070, we perform a comprehensive analysis of its near infrared/optical/…
Multiwavelength Observations of the Black Hole X-ray Binary MAXI J1820070 in the Rebrightening Phase
Tomohiro Yoshitake, Megumi Shidatsu, Yoshihiro Ueda +14
We report the results of quasi-simultaneous multiwavelength (near-infrared, optical, UV, and X-ray) observations of the Galactic X-ray black hole binary MAXI J1820+070 performed in…
Probing the origin of the two-component structure of broad line region by reverberation mapping of an extremely variable quasar
Shumpei Nagoshi, Fumihide Iwamuro, Satoshi Yamada +5
The physical origins of quasar components, such as the broad line region (BLR) and dust torus, remain under debate. To gain insights into them, we focused on Changing-State Quasars…
Observational signatures of forming young massive clusters: continuum emission from dense HII regions
Mutsuko Inoguchi, Takashi Hosokawa, Hajime Fukushima +3
Young massive clusters (YMCs) are the most massive star clusters forming in nearby galaxies and are thought to be a young analogue to the globular clusters. Understanding the forma…
Model of a `Warm Corona' as the Origin of the Soft X-ray Excess of Active Galactic Nuclei
Norita Kawanaka, Shin Mineshige
The soft X-ray excess in the spectra of active galactic nuclei is characterized by similar electron temperatures of 0.1 -- 0.3 keV and similar photon indices around 2.2 -- 3, if fi…
Diverse Polarimetric Features of AGN Jets from Various Viewing Angles: Towards a Unified View
Yuh Tsunetoe, Shin Mineshige, Tomohisa Kawashima +3
Here, we demonstrate that polarization properties show a wide diversity depending on viewing angles. To simulate images of a supermassive black hole and surrounding plasma, we perf…