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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…
High-velocity blue-shifted Fe XXV He line during a superflare of the RS CVn-type star IM Peg
Shun Inoue, Wataru Buz Iwakiri, Teruaki Enoto +8
Monitor of All-sky X-ray Image (MAXI) detected a superflare, releasing erg in 210 keV, of the RS CVn-type star IM Peg at 10:41 UT on 2023 July 23 with its Gas…
X-ray plasma flow and turbulence in the colliding winds of WR140
Asca Miyamoto, Yasuharu Sugawara, Yoshitomo Maeda +4
We analyse RGS spectra of Wolf-Rayet (WR) 140, an archetype long-period eccentric WR+O colliding wind binary. We evaluate the spectra of O and Fe emission lin…