Hello. I am an associate professor at Osaka University, interested in understanding the nature of black holes. As an astronomer, I have been working on both theoretical and observational astrophysics.

Graduation Day

 2024年03月25日に投稿  |  1 分間  |  157 言葉  |  

We are proud to announce the graduation of our esteemed students on March 25th, marking a significant milestone in their academic careers. Our master’s students, Kaoru Yanagisawa and Tomoya Yamada, were awarded their Master’s degrees, showcasing their exceptional skills and dedication in their respective fields of study. On the same day, our undergraduate student, Pan Yue, received her Bachelor’s degree, demonstrating her hard work and commitment to her studies. Thesis titles: [続きを読む]
people 

Bachelor Thesis Presentation Day

 2023年02月13日に投稿  |  1 分間  |  63 言葉  |  

We are pleasure to hear that two excellent undergraduate students in our group defended their bachelor thesis presentations. Katsunori Kusakabe looked into the stellar magnetic field condition to realize the magnetically arrested disk in X-ray binaries. Tatsuki Fujiwara worked on 26Al gamma-ray line signals from solar bodies as well as the estimation of past cosmic-ray activity using comets. Congratulations to all of them!

people 

Our paper on the contribution of radio galaxies to the cosmic gamma-ray background radiation is accepted by ApJ.

 2022年04月26日に投稿  |  2 分間  |  218 言葉  |  

Title: High energy emission component, population, and contribution to the extragalactic gamma-ray background of gamma-ray emitting radio galaxies. Authors: Yasushi Fukazawa, Hiroto Matake, Taishu Kayanoki, Yoshiyuki Inoue, Justin Finke In this study, we systematically studied the X-ray to GeV gamma-ray spectra of 61 {\it Fermi} Large Area Telescope (LAT) detected radio galaxies. We found an anticorrelation between peak frequency and peak luminosity in the high-energy spectral component of radio galaxies, similar to blazars. [続きを読む]
research 

Bachelor Thesis Presentation Day

 2022年02月16日に投稿  |  1 分間  |  27 言葉  |  

We are pleasure to hear that our excellent undergraduate student defended his bachelor thesis presentation. Tomoya Yamada worked on radio emission signals from AGN disk winds. Congratulations!

people 

Our paper on a fundamental plane in X-ray binary activity of external galaxies is accepted by PASJ.

 2021年07月04日に投稿  |  1 分間  |  164 言葉  |  

Title: A fundamental plane in X-ray binary activity of external galaxies. Authors: Yoshiyuki Inoue, Kiyoto Yabe, Yoshihiro Ueda We construct a new catalog of extragalactic X-ray binaries (XRBs) by matching the latest Chandra source catalog with local galaxy catalogs. Our XRB catalog contains 4430 XRBs hosted by 237 galaxies within $\sim130$ Mpc. As XRBs dominate the X-ray activity in galaxies, the catalog enables us to study the correlations between the total X-ray luminosity of a galaxy, star formation rate, and stellar mass. [続きを読む]
research