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.
Our group member, Tomonari Michiyama, is now an assistant professor at Shunan University .
Bachelor Thesis Presentation Day
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!
Dr. Ellis R. Owen joined our group.
Our paper on the contribution of radio galaxies to the cosmic gamma-ray background radiation is accepted by ApJ.
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.
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Our Group Member, Naomi Tsuji, is now an assistant professor at Kanagawa University .
Bachelor Thesis Presentation Day
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!
Our paper on interstellar gas heating by PBHs is accepted by JCAP.
Title: Interstellar Gas Heating by Primordial Black Holes.
Authors: Volodymyr Takhistov, Philip Lu, Graciela B. Gelmini, Kohei Hayashi, Yoshiyuki Inoue, Alexander Kusenko
Our paper on a fundamental plane in X-ray binary activity of external galaxies is accepted by PASJ.
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.
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Our paper on spatial variations of magnetic field along active galactic nuclei jets on sub-pc to Mpc scales is accepted by ApJ.
Title: Spatial variations of magnetic field along active galactic nuclei jets on sub-pc to Mpc scales.
Authors: Soichiro Ito, Yoshiyuki Inoue, Jun Kataoka
We report the systematic analysis of knots, hotspots, and lobes in 57 active galactic nuclei (AGNs) to investigate the variation of the magnetic field along with the jet from the sub-pc base to the terminus in kpc-to-Mpc scales. Expanding the number of radio/X-ray samples in \citet{2005ApJ…622..797K}, we analyzed the data in 12 FR~I and 30 FR~II radio galaxies, 12 quasars, and 3 BL Lacs that contained 76 knots, 42 hotspots, and 29 radio lobes.
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