News

Talk at the HEA seminar at the CfA

I remotely gave a presentation at the High Energy Seminar at the Center for Astrophysics | Harvard-Smithsonian. The title was “Gamma-ray and X-ray studies on particle acceleration in supernova remnants: basic trends and a variety”. 12:30 PM in Boston is 2:30 AM in Japan.

Young Scientist Award of the Physical Society of Japan

I have been selected as a winner of the Young Scientist Award of the Physical Society of Japan. The prize is for my studies on particle acceleration physics in supernova remnants through gamma-ray and thermal X-ray observations.

Chandra X-ray study of the RCW 86 southwestern region

Our recent paper entitled “Particle acceleration controlled by ambient density in the southwestern rim of RCW 86” has been accepted for publication in ApJ (arXiv link). The southwestern region of the supernova remnant RCW 86 is very suitable for studying how acceleration conditions are affected by environmental properties. We have found that the acceleration efficiencyContinue reading “Chandra X-ray study of the RCW 86 southwestern region”

Presentation at Gamma 2022

I will give a presentation at the 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy. The presentation is about our systematic study on the particle acceleration in supernova remnants based on Suzuki et al. 2022.

Presentation at EAS 2022

I will give a presentation at the European Astronomical Society Annual Meeting 2022. The presentation is about our recent X-ray study of RCW 86 (ApJ, under review). We investigated the shock velocity, thermal & non-thermal X-ray properties of the southwestern region of RCW 86. Our findings suggest that ambient density controls the particle acceleration conditions:Continue reading “Presentation at EAS 2022”

Presentation at IACHEC 2022

I gave a presentation about the Chandra ACIS particle-induced background at IACHEC 2022. The mkacispback tool is now also found on the XSPEC “more models ” webpage. The detector background of different satellites with different orbits is very interesting.

Are supernova remnants PeVatrons ?

Our latest work is accepted for publication in ApJ. In this work, we have studied X-ray and gamma-ray properties of supernova remnants to evaluate their maximum attainable energies during lifetime. As most astrophysicists know, there are only a few supernova remnants which are accelerating particles up to PeV energies. We have evaluated this in aContinue reading “Are supernova remnants PeVatrons ?”

Chandra ACIS particle-induced background modeling tool

To model the particle-induced background spectrum for an arbitrary celestial observation with Chandra ACIS, we thoroughly analyzed all the available calibration data of the ACIS taken in 2002–2016 and have developed a tool to generate a model spectrum. We found CCD position-to-position and temporal variations of their energy spectra. The spatial variations were mostly seenContinue reading “Chandra ACIS particle-induced background modeling tool”

Quantitative Age Estimation of Supernova Remnants and Associated Pulsars

Our work on age estimation of supernova remnants has been accepted for publication in ApJ. The arXiv link is available. The motivation is that we still cannot be sure about the reliability of supernova remnants’ estimated ages, and thus want to quantify it. We have thoroughly collected available systems in which reliable age estimations wereContinue reading “Quantitative Age Estimation of Supernova Remnants and Associated Pulsars”

Moved to Konan University

Now I am at Konan University as a JSPS postdoc. Here I am working with Takaaki Tanaka. I plan to do observational studies of supernova remnants and detector development using X-ray CMOS sensors. Currently I am especially interested in cosmic rays, supernova remnants, in-orbit detector background of X-ray and gamma-ray satellites and X-ray detector development.Continue reading “Moved to Konan University”

Ph. D. Thesis

As my Ph. D. thesis, I have studied particle acceleration environment of supernova remnants (SNRs) through X-rays and gamma-rays. Maximum energies of accelerated particles and their dependence on environments were of particular interest. Investigating each SNR is not enough to study the evolution of the maximum energies. Thus I have used almost all the availableContinue reading “Ph. D. Thesis”

Finished Ph.D. program

I have finished my Ph.D. defense and graduated from The University of Tokyo. The dissertation title is “Systematic Study of Escape Processes of Cosmic Rays from Supernova Remnants based on Gamma-ray and Thermal X-ray Properties”. I have studied how accelerated particles diffuse from their acceleration sites, supernova remnants using X-ray and gamma-ray observational data. ToContinue reading “Finished Ph.D. program”

Papers before 2021

Hagino et al., JATIS, 2020We studied the particle-induced background of the Hitomi HXI. Different layers of the Si-DSSDs and CdTe-DSD show different origins: trapped electrons, Albedo neutrons, and activation. Suzuki et al., PASJ, 2020We performed a systematic study on gamma-ray emitting supernova remnants. We found that acceleration energy confined around shocks decreases with increasing time,Continue reading “Papers before 2021”


%d bloggers like this: