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Revisiting the Suzaku spectrum of the Galactic SNR W 49 B: non-detection of iron K-shell charge exchange emission and refined ejecta mass ratios of iron-group elements
Makoto Sawada, Toshiki Sato, Keiichi Maeda +1
The origin of the recombining plasma in several Galactic SNRs has been debated. A plausible mechanism would be a rapid cooling in the past, either by adiabatic or conductive proces…
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…
Probing Shocked Ejecta in SN 1987A with XRISM-Resolve: the effects of the gate valve closed
Vincenzo Sapienza, Marco Miceli, Aya Bamba +10
Supernova (SN) 1987A is widely regarded as an excellent candidate for leveraging the capabilities of the freshly launched XRISM satellite. Recent researches indicate that the X-ray…
Is the low-energy tail of shock-accelerated protons responsible for over-ionized plasma in supernova remnants?
Makoto Sawada, Liyi Gu, Ryo Yamazaki
Over-ionized, recombining plasma is an emerging class of X-ray bright supernova remnants (SNRs). This unique thermal state where the ionization temperature () is signifi…
Missing Titanium in the Asymmetric Supernova Remnant W49B
Toshiki Sato, Makoto Sawada, Keiichi Maeda +2
The progenitor of the W49B supernova remnant is still under debate. One of the candidates is a jet-driven core-collapse supernova. In such a highly asymmetric explosion, a strong $…