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Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations
XRISM Collaboration
Sagittarius A East is a supernova remnant with a unique surrounding environment, as it is located in the immediate vicinity of the supermassive black hole at the Galactic center, S…
The XRISM/Resolve view of the Fe K region of Cyg X-3
XRISM Collaboration
The X-ray binary system Cygnus X-3 (4U 2030+40, V1521 Cyg) is luminous but enigmatic owing to the high intervening absorption. High-resolution X-ray spectroscopy uniquely probes th…
X-Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere induced by the 2022 Hunga-Tonga Volcano Eruption-Explosion
Satoru Katsuda, Hiroyuki Shinagawa, Hitoshi Fujiwara +14
We present X-ray observations of the upper atmospheric density disturbance caused by the explosive eruption of the Hunga Tonga-Hunga Ha'apai (HTHH) volcano on 15 January 2022. From…
Evidence for Type Ib/c origin of the supernova remnant G292.0+1.8
Takuto Narita, Hiroyuki Uchida, Jacco Vink +6
Circumstellar material (CSM) produced by mass loss from massive stars () through strong stellar winds or binary stripping provides rich information for underst…
Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim
Takumi Kishimoto, Kumiko K. Nobukawa, Ayaki Takeda +11
Measurements of the upper atmosphere at ~100 km are important to investigate climate change, space weather forecasting, and the interaction between the Sun and the Earth. Atmospher…
SUIM project: measuring the upper atmosphere from the ISS by observations of the CXB transmitted through the Earth rim
Kumiko K. Nobukawa, Ayaki Takeda, Satoru Katsuda +16
The upper atmosphere at the altitude of 60-110 km, the mesosphere and lower thermosphere (MLT), has the least observational data of all atmospheres due to the difficulties of in-si…