Category Archives: Unclassified

Our team, lead by Yuken Ohshiro (ISAS/JAXA), has developed an optically-thin thermal plasma model which calculates non-equilibrium temperature and ionization processes. The ApJ paper has been published (ADS). This is an updated version of the conventional XSPEC models (nei, rnei), where the electron temperature is assumed to be constant in time.

XRISM team members gathered at Tokyo Metropolitan University to share the latest status of the satellite operations, calibration, and scientific activities. We are still in the early phase of the mission, where the calibration and analysis software are not complete, and thus talking with people with various expertise is of great importance. It was soContinue reading “XRISM science meeting in Japan (SM6)”

XRISM collaboration’s first paper on the LMC supernova remnant N132D has been accepted for publication in PASJ (ADS link). We successfully constrained the line widths and redshifts, and thereby confidently separated multiple temperature components. The narrow lines of Si, S, and Ar, and a broad Fe Hea triplet can be understood as due to differentContinue reading “XRISM first paper on supernova remnant N132D!”

Articles about our recent work on the remnant of SN1181 have been published based on our recent work (ADS). We put together our theoretical and observational efforts to understand the peculiar object IRAS 00500+6713. We propose that this object is the remnant of SN1181, which we believe was a type Iax supernova. (article in EnglishContinue reading “Fresh wind blows from historical supernova SN1181”

Our contribution to the SPIE 2024 proceedings, “Initial operations of the Soft X-ray Imager onboard XRISM” has been published (arXiv, SPIE). While scientific importance is not necessarily high, I hope this paper will work well as a summary of what and how we worked hard on in the commissioning phase of XRISM.

This year’s SPIE conference was held in Yokohama, Japan. I gave a poster presentation about the initial operations of Soft X-ray Imager onboard XRISM. I met a lot of people working on detectors, optics, and satellite missions. In the field of the high energy astrophysics, latest attracting topics seem to include the China’s rapid growthContinue reading “SPIE in Yokohama, Japan”

I have attended the conference Supernova Remnants III: An Odyssey in Space after Stellar death held at Crete, Greece, in this June. I gave a poster presentation about our recent paper on decelerating X-ray knots and rims of RCW 103. I remember attending the “Supernova Remnants II” held at the same place in 2019. IContinue reading “Supernova remnant conference at Crete”

I had a presentation and a lot of discussion at the 16th IACHEC meeting at Parador de La Granja (Spain). Cross-calibration of X-ray missions are of increasing importance with the emergence of new instruments including XRISM and fast-evolving Chinese missions.

The CCD camera Xtend on XRISM observed SN1006. Thanks to its large field of view of 38×38 arcmin, entire emission of SN1006 was covered with one pointing. The image is really amazing. (Image credit: JAXA)

I gave a presentation on XRISM/Xtend’s in-orbit performance at the XRISM workshop held in Geneva in Feb 12–14. Many young scientists were there, hoping to produce wonderful scientific results with XRISM.